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Article

Novel Biodegradable Poly (Lactic Acid)/Wood Leachate Composites: Investigation of Antibacterial, Mechanical, Morphological, and Thermal Properties

by
Mohammad Hassan Shahavi
1,*,
Peyman Pouresmaeel Selakjani
1,
Mohadese Niksefat Abatari
1,
Petar Antov
2,* and
Viktor Savov
2
1
Faculty of Engineering Modern Technologies, Amol University of Special Modern Technologies (AUSMT), Amol 4615664616, Iran
2
Faculty of Forest Industry, University of Forestry, 1797 Sofia, Bulgaria
*
Authors to whom correspondence should be addressed.
Polymers 2022, 14(6), 1227; https://doi.org/10.3390/polym14061227
Submission received: 23 February 2022 / Revised: 10 March 2022 / Accepted: 15 March 2022 / Published: 18 March 2022
(This article belongs to the Special Issue Eco-Friendly Wood Composites: Design, Characterization and Applications)
Browse Figures
Versions Notes

Abstract

:
This research aimed to investigate the effects of using wood leachate (WL) powder as a cost-effective filler added to novel poly (lactic acid) biocomposites and evaluate their mechanical, thermal, morphological, and antibacterial properties. Fourier transform infrared spectroscopy (FTIR), tensile test, Charpy impact test, Shore hardness, scanning electron microscope (SEM), differential scanning calorimetry (DSC), contact angle, and bacterial growth inhibition tests were employed to characterize the developed biocomposites. The SEM results indicated a proper filler dispersion in the polymer matrix. WL powder improved the hydrophobic nature in the adjusted sample’s contact angle experiment. Markedly, the results showed that the addition of WL filler improved the mechanical properties of the fabricated biocomposites. The thermal analysis determined the development in crystallization behavior and a decline in glass transition temperature (Tg) from 60.1 to 49.3 °C in 7% PLA-WL biocomposites. The PLA-WL biocomposites exhibited an antibacterial activity according to the inhibition zone for Escherichia coli bacteria. The developed novel PLA-WL composites can be effectively utilized in various value-added industrial applications as a sustainable and functional biopolymer material.

Graphical Abstract

1. Introduction

In recent years, the enhanced environmental awareness, the increased need for sustainable and “green” materials, as well as the stringent legislative regulations related to waste management and cascading use of natural resources have forced many researchers to develop novel biodegradable polymers as a viable alternative to conventional polymers [1,2,3,4,5]. Despite the numerous advantages of biocomposites such as the potential to create a sustainable industry as well as enhancement in various properties such as durability, flexibility, high gloss, clarity, and tensile strength, there are certain drawbacks, such as deteriorated physical and mechanical properties, poor interface adhesion, brittleness, lower thermal resistance and water absorption, susceptibility to fungi and insect attacks, etc., limiting their wider application as functional materials [6,7,8,9]. Poly (lactic acid) (PLA) is one of the most suitable biodegradable polymers widely employed in many applications ranging from the biomedical field, e.g., in engineered drug delivery systems [10,11], tissue engineering (scaffolds) [12,13], and wound dressing [14,15] to food packaging and disposable plastic bags [16,17,18] due to its versatility, excellent processability, and biocompatibility. It is also widely used as a 3D printing feedstock for desktop fused filament fabrication 3D printers [19]. PLA is a biodegradable aliphatic semicrystalline polyester synthesized from lactic acid monomer (LA; 2-hydroxypropanoic acid), which is soluble in water and occurs in two enantiomeric forms, i.e., l-(+)-LA and d-(−)-LA. PLA represents a sustainable alternative to fossil-derived products, since it is derived from the fermentation of renewable agricultural biomass resources rich in carbohydrates, such as corn starch and sugar beets. Filler materials have been widely used in the polymer industries for economic reasons. Furthermore, it was reported that the fillers could also improve biocomposites’ mechanical and thermal properties [20,21,22,23,24]. Lignocellulosic waste and residues are among the most widely used fillers in polymeric composites. Using these natural materials will produce lighter products and lower the environmental footprint due to their biodegradability and lower cost. Another important benefit of using natural waste and by-products is significantly improving polymers’ mechanical properties [25,26,27].
As in any wood-based industry, the medium-density fiberboard (MDF) production factories usually use wood as their feedstock [28]. In the process of MDF production and after wood chipping, the chips are washed with high-pressure steam. The waste produced by this process is a dark brown liquid called leachate. The wood leachate (WL) has a complex composition, but as mentioned in the literature, the leachate compounds are mostly phenol, tannins, lignin, and volatile fatty acids [29,30,31]. The structure of the main components present in the WL is shown in Figure 1.
The wood-based composite industry has developed rapidly during the last few decades, and its continued development is expected, e.g., the global demand for wood-based materials is projected to increase threefold between 2010 and 2050. In 2019, the annual global production of wood-based composites was estimated to be 357 million m3 [2]. This generates a massive amount of organic waste, i.e., from acid waste to aromatic leachates. In recent years, due to the increasing global environmental awareness, the need to decrease dependence on petroleum-based products, and new environmental regulations, great attention has been paid to the possibilities of developing biodegradable polymers from renewable, bio-based agricultural waste and residues [32,33,34]. Considering the great amounts of WL discharged by the wood-based industries, it is feasible to develop new methods for its efficient recycling and reuse in value-added applications. In addition, reusing WL waste solves waste management issues and has remarkable economic and environmental benefits. This acidic waste material could harm the environment and thus needs to be treated before discharge. Leachates may contain large quantities of organic pollutants such as ammonia (NH3), heavy metals, mineral salts, and phenol derivatives. Moreover, previous work has shown that this leachate can infiltrate and pollute the soil and the surrounding water, creating an environmental problem that needs to be addressed [35,36,37,38]. The WL’s main components, i.e., lignin, phenol, and tannin, can be used as a natural filler in polymer composites. The lignin in the WL could play a strong bioadhesive role in the polymeric blends, and the phenol and tannin could prevent bacterial growth on the composite surface [39,40].
This research aimed to evaluate the feasibility of using WL powder as an additive in PLA-based biocomposites and evaluate their exploitation properties. The chemical structure of the fabricated composites was characterized using Fourier transform infrared spectroscopy (FTIR). The effects of WL incorporation on the mechanical, thermal, and morphological properties of the PLA matrix were investigated using tensile tests, differential scanning calorimetry (DSC), and field emission-scanning electron microscopy (FE-SEM). Furthermore, the inhibition zone examination was used to detect the antimicrobial behavior of the developed PLA-WL biocomposites using Escherichia coli (E. coli) as the model microbe.

2. Materials and Methods

2.1. Materials

The PLA (CAS No: 26100-51-6) with a molecular weight of 80,000 g/mol, a specific gravity of 1.24 g/cm3, and a melting point of 155–170 °C was purchased from BIOKAS Ö5 (Chemiekas GmbH, Vienna, Austria). The raw WL (with 3% solids content) and fibers used in this work were supplied by the Arian Maryam Incorporation factory (AMI, Rasht, Iran) from the Arian Saeed Industrial Group. The lignin weight percentage of dry WL was determined as the acid-insoluble Klason lignin. The standard approach for determining lignin content is based on Klason’s method of hydrolysis of materials using 72% sulfuric acid (Merck 1.00748 98% diluted). Lignin is the substance remaining after hydrolysis in this step, and it is the insoluble residual extracted by filtration and measured by the gravimetric procedure [41,42]. The lignin content of dried WL was determined to be about 22%.

2.2. Biocomposite Preparation

To prepare the novel biocomposites, WL was vacuum dried at 100 °C in a vacuum oven (Memmert® GmbH & Co. KG, Schwabach, Germany) at the first step. Then, the obtained solid material was grounded in powder using a lab-scale mill. The PLA was also vacuum dried at 70 °C to evaporate the moisture content. WL powder was dry blended with PLA and then melted compounded in an internal mixer (Brabender® GmbH & Co. KG, Duisburg, Germany) at 180 °C for 15 min with the screw rotor speed of 50 rpm. The manufacturing parameters of the laboratory-fabricated PLA-WL biocomposites are given in Table 1. The prepared biocomposite blends were placed into a mold of 2 mm height, and the sheets were fabricated by a hot-pressing process in a laboratory press of 5 tons. The press temperature applied was 180 °C. The pressure value used was 1.4 MPa for 5 min [43].

2.3. Characterization

2.3.1. Structural and Thermal Analysis

FTIR spectroscopy was employed to identify the composites’ functional groups. A Bruker Equinox 55LS 101 series instrument (Bruker, Karlsruhe, Germany) with a resolution of 4 cm−1 (50 scans on average) was used for this purpose. The Netzsch DSC Maia 200 F3 facilitated with a low-temperature accessory was employed for performing the DSC analysis. It was performed at a 20 °C/min heating rate at temperatures ranging from −20 to 280 °C through a nitrogen atmosphere. The stepwise specific heat increment midpoint was taken as the glass transition temperature (Tg). All DSC adjustments were made according to ASTM D3418 [44].

2.3.2. Mechanical and Morphological Investigation

The tensile stress–strain experiments were accomplished using a Gotech Universal testing machine AI-7000-LA (Gotech Testing Machines, Inc., Taichung, Taiwan), following the ASTM D638 [45]. The examinations were carried out at room temperature (25 °C). The experiments were carried out at a 5 mm/min cross-head speed. At least five test specimens of any composition were considered for tensile tests. The ASTM D256 [46] standard was followed to perform the Charpy impact strength measurement of the developed composites. The notched test specimens (80 × 10 × 3.8 mm3) were tested using FRANK Baldwin-Model-BLI pendulum impact testing equipment (Frank Bacon, Warren, MI, USA). A 45 V-shaped notch was made in the center of the impact sample by razor notching equipment (CEAST). The notch tip radius was 0.25 mm, and the specimen depth remaining under the notch was 10.17 mm. For each composition, at least five samples were examined. Shore A sample hardness was measured using FRANK measuring instruments with ASTM D2240 [47]. Philips (Philips-X130) SEM equipment was employed for identifying the fracture surface of the prepared composite sheets in liquid N2. The SEM micrographs of the surface were obtained using the cold field emission mode on the surface of samples [48,49,50,51].

2.3.3. Surface Hydrophobicity and Antibacterial Activity

The hydrophobicity of the laboratory-fabricated biocomposites was measured using a Kruss G10 contact angle measurement system (KRÜSS GmbH, Hamburg, Germany). The contact angle of the distilled water droplets was calculated on the composite surface [52].
The antimicrobial behavior of the developed composite materials was analyzed using E. coli bacteria. The E. coli bacteria was inserted into a liquid broth and cultivated under stirring of 120 rpm for 10 h at 37 °C in a shaking incubator. The resulting sample was diluted to around 100 (CFU)/mL using the broth media, and then, the diluted mixture was added to the agar medium. The PLA and PLA-WL samples were sterilized by autoclaving and placed on the plates with the agar’s surface in the tangent state and were incubated for 24 h at 37 °C. A comparative analysis of the biocomposites’ antimicrobial behavior measured the bacterial growth inhibition region (μm) [53,54].

3. Results and Discussion

3.1. Structural Characterization

The FTIR absorption peaks of the pure PLA and the PLA-WL biocomposites are shown in Figure 2. The C=O stretching absorption peaks related to PLA or ester groups were detected at 1750 cm−1. The C–O bonds in the PLA structure were visible at 1182 cm−1. The peak at 1363 cm−1 was related to PLA methyl groups and C–H bonds vibration. The C–C bonds stretching peak of the PLA chemical structure appeared at 836 cm−1.
After incorporating WL to the PLA matrix, the band near 1490 cm−1 was attributed to vibration of the phenolic rings, and the peaks at 1450, 1210, 1188 cm−1 for phenolic ring or phenolic hydroxyl groups vibrations [55,56] appeared in the spectrums of PLA-WL. That is proved by the WL’s phenolic structures (i.e., lignin, tannins, and phenol). The only difference between PLA-WL peaks are in their intensity that is related to the amount of filler and its compounds within the sample.

3.2. Mechanical Properties

The results obtained for the mechanical properties of the laboratory-made PLA-WL biocomposites, i.e., tensile strength, break elongation, and elastic modulus, are presented in Table 2.
A graphical representation of the stress–strain curves of the developed PLA-WL biocomposites with different addition levels of WL as a filler is shown in Figure 3. Data are in correspondence to previously reported specifications for high molecular weight PLA [57]. The tensile strength of the PLA-WL blends was slightly increased by the filler loading increment (WL powder). The tensile strength was increased by about 400% at PLA-WL-7, which has a 7% concentration of the WL powder in its structure. The higher tensile strength of the filler-induced samples indicated the effect of lignin in the WL structure. The lignin has a paste-like impact within the polymer matrix that causes higher tensile strength values [58]. Lignin penetrates into the gaps of adjacent particles and intramolecular space of the PLA, and it improves the interfacial adhesion between WL filler and PLA matrix (physical adhesion) [59].
Markedly, the elongation at break was also increased in higher WL filler-loaded samples. This might be attributed to the plasticization effect of the lignin. Plasticization is described as the action of plasticizers on the matrix structure of materials, causing it to swell. Plasticizers reduce the Tg and melt viscosity by increasing the free volume by spacing polymer chains and increasing the mobility of chain segments. Lignin’s plasticization effect will also help to improve polymer matrix mobility via the effects of OH groups presents on lignin structure, which interacts with the polymer structure and leads to higher mobility as well as the processability and toughness of the resulting composite [60]. It was reported that high filler content increased the agglomeration probability [61], and the regions with stress concentration that requires less energy to crack will exist in this regard. The findings showed a significant decrease in tensile strength at 9% WL powder content. The localization of WL agglomerates between the PLA polymer chains in PLA-WL-9 resulted in decreased biocomposite break elongation. The steric hindrance of lignin, phenol, and tannin bonds in high WL powder concentrations leads to lower lock energy between the PLA chains.
The elastic modulus of the PLA-WL-3 specimen indicated a drop following WL’s addition due to lignin’s plasticization effect, referring to Table 2. The lignin mechanically bound the PLA chains in higher WL volumes, and the lignin’s paste activity exceeded its plasticization impact. Lignin could fit the polymer matrix, causing less mobility than the samples without or with a fewer percentage of WL powder filler [62].
During force loading in the testing machine, partial spaces were made, which barricaded the stress dissemination between the matrix and the filler. The degree of locking increased as the filler loading increased, raising the elastic modulus and stiffness. At the PLA-WL-9 sample, a sudden drop was observed related to the agglomeration of filler materials. The data relating to the Charpy impact strength of the fabricated films are presented in Table 2. The Charpy impact strength of the biocomposites was enhanced by the increment of the filler content from the results. Regular energy transfer in the matrix is substantial for impact persistence [63]. The highest impact resistant composition in this study was the PLA-WL-7 sample with an impact strength of 74.56 KJ/m2, and the factor has a growing trend by the addition of filler up to this composition. In dispersed phases addition into a polymer matrix, the dispersed phase’s good dispersion, filler particle sizes, and proper interfacial incorporation are the most critical factors determining the materials’ optimum performance. The blend’s impact strength drop with 9% WL powder was due to some unfavorable filler dispersion in the polymer matrix.
The composite’s hardness results are shown in Table 2. The hardness of the blended sheets increased with the higher filler content. It may be due to the WL powder dispersion and void minimization into the PLA matrix and intense physical engagement between the WL and PLA chains. However, the hardness increment value by filler addition has a slight trend, which is caused by dispersion of the WL within the structure and not just on the surface of the developed biocomposites. The highest hardness value of 92.3 was determined for the PLA-WL-7 sample. It can also be deduced that the filler increased the hardness of polymeric materials by filling the empty micro gaps between the polymer frameworks. Overall, the mechanical properties showed that 3–7% content of WL powder could be applied as filling material, leading to amelioration in the PLA composite’s mechanical properties, such as tensile strength, impact strength, and hardness. In addition, the induction of lignin, tannin, and phenol in low concentrations to the polymer blend can make it widely applicable in different industries according to the antibacterial effects of these materials, which are explained in the following section.

3.3. Thermal Behavior

The DSC analysis was employed to investigate the effect of various filler (WL powder) loadings on the thermal characteristics of the developed PLA-WL biocomposites. Understanding the polymers’ crystallization behavior under dynamic conditions is considerable because most processing procedures perform in non-isothermal conditions [64,65]. Figure 4 illustrates the crystallization exotherms of the PLA-WL biocomposites. The parameters of the DSC curves for crystallization exotherms, such as the crystallization peak (Tc), glass transition temperature (Tg), and the crystallization enthalpy (dHc), were calculated from the under peak surface area.
The WL had a positive effect on the crystallization behavior of the PLA as the crystallization peak temperature was shifted to higher values after incorporating the WL filler. As expected, it also induced the crystallization enthalpy. The highest crystallization degree was determined for the PLA-WL sample. The higher crystalline structure of the PLA-WL-7 led to a high mechanically strengthened material [66,67], which complies with the results from mechanical testing. The plasticization effect of lignin leads to the free movement of the PLA chains, and as a result, the crystallinity of the modified composites became higher than that of neat PLA. On the other hand, high amounts of lignin and other phenolic compounds (in PLA-WL-9) present in the WL composition significantly reduced the polymer chains mobility caused by the steric hindrance impact associated with their aromatic composition.
Subsequently, the glass transition temperature was lowered by incorporating WL powder into the composite structure. The PLA had a Tg drop at 60.1 °C, and it is evident that WL lowers Tg as it makes the chains more mobile during the matrix due to its plasticization effect. According to the DSC results, the Tg has a positive trend by increasing the WL content in the laboratory-made biocomposites. This might be attributed to the chain locks occurring by increasing the filler amount. Lignin could hinder the polymer chains’ movement, resulting in greater Tg in higher WL filler ratios. Conversely, lignin could enhance the PLA chains mobility due to its plasticization effect, facilitating crystallization growth and improving crystallinity.

3.4. Morphology

The SEM technique was used to identify the biocomposites’ morphological modifications on the surface and cross-sections split in liquid N2. A graphical representation of the samples’ SEM images (PLA, PLA-WL-7, and PLA-WL-9 biocomposites) is presented in Figure 5.
The PLA had a smooth surface with some voids related to the humidity vaporization from the surface during the hot pressing process. The uniform structure was detected for PLA in both surface and cross-section images. The WL powder’s presence in the structure of the PLA-WL-7 biocomposite was completely observable from changes in the morphology in the SEM micrographs of this sample. Different phases were detectable, and WL powder was well dispersed between the PLA matrixes. No micro-domains were observed in the developed PLA-WL composites. The homogeneous surface resulted from the obtained good dispersion of WL in the PLA matrix during the process, confirming the composites’ enhanced mechanical performance containing 7% WL. The optimal mechanical and thermal characteristics were determined for the PLA-WL-7 sample. These improvements were proved by illustrating WL proper dispersion in the polymer matrix. A powerful filler and matrix engagement due to the lignin’s paste impact was evident in the images. The SEM micrographs of the fracture surface for the PLA-WL-9 sample are illustrated in Figure 5e,f. Some agglomerations of WL are detectable within the image. The results correspond with the mechanical testing results due to the reduced mechanical strength of this sample compared with the PLA-WL-7 composite.

3.5. Contact Angle

The developed biocomposites’ contact angles determined the surface wettability (Figure 6). The contact angles increased from about 46° to 66° when the WL was incorporated into the PLA matrix at 7 wt % concentration. It was observed that the addition of phenolic compounds which are presented in the WL enhanced the hydrophobicity of the composite surface. The reason for this hydrophobicity is the emplacement of the WL with hydrophobic phenolic functional groups in the micro spaces of the PLA matrix. The data achieved from the contact angle tests agree with the antibacterial activity test, which is reported in the next section. This study may serve as a stepping stone for future investigations to solve some of the critical problems of bioplastic industries by preventing moisture diffusion and inducing the antibacterial activity into a biodegradable packaging material, i.e., PLA.

3.6. Antibacterial Behavior

The materials’ antibacterial activity is associated with their physical and chemical properties such as the functional groups, dispersion of antibacterial agents, and surface roughness. It is well known that bacteria tend to be cultured on hydrophilic surfaces, and thus, hydrophobic surfaces may inhibit bacterial growth [68,69,70]. For examining the antibacterial characteristics of PLA-WL biocomposites, the association of the E. coli bacteria with neat PLA and PLA-WL was mentioned. Figure 7 indicates composites’ behavior in the forms of cytotoxic effects. The density of the bacterial growth around the neat PLA indicates that there is no antimicrobial activity in the neat PLA structure. WL powder insertion into the PLA matrix structure led to a lower microbe density across the test sheet, suggesting an inhibitory effect. The results illustrated that the PLA-WL-3 has no bacterial growth inhibition, unlike the neat PLA sample. On the other hand, PLA-WL-5, PLA-WL-7 and PLA-WL-9 have shown growth inhibition zones, and this activity is more indicatable in PLA-WL-9. This result proved the claim of the antibacterial effect of WL on E. coli growth. The expressed antimicrobial behavior of the PLA-WL composites proved their potential use in various packaging applications to inhibit bacterial growth. The authors postulate that phenolic compounds in the WL structure caused the PLA-WL composite’s antibacterial properties.

4. Conclusions

The results indicated that the WL powder filler induction in the PLA matrix could enhance the polymer’s mechanical characteristics. WL significantly improved all of the PLA’s mechanical properties, such as tensile strength, elongation at break, and hardness. The addition of WL resulted in an enhanced Charpy impact strength of the biocomposites. The PLA’s thermal stability and crystallization behavior were also improved with the addition of WL as a filler. The surface hydrophobicity of the PLA-WL biocomposites was improved compared to the neat PLA sample. The antibacterial activity is another benefit that the WL added to the PLA. In bio-industries, preventing moisture diffusion and bacterial growth are very significant challenges. The induction of these properties to the PLA as a biopolymer could make the WL suitable as a filler for various industrial applications.

Author Contributions

Conceptualization, M.H.S.; methodology, M.H.S.; investigation, P.P.S. and M.N.A.; resources, M.H.S.; writing—original draft preparation, P.P.S.; writing—review and editing, M.H.S., P.A. and V.S.; visualization, P.P.S.; supervision, M.H.S.; project administration, M.H.S.; funding acquisition, M.H.S. All authors have read and agreed to the published version of the manuscript.

Funding

This research work was supported by project No. P/8/995 carried out at the Amol University of Special Modern Technologies, Amol, Iran. This research was also supported by the project No. HИC-Б-1145/04.2021 “Development, Properties, and Application of Eco-Friendly Wood-Based Composites” carried out at the University of Forestry, Sofia, Bulgaria.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Not applicable.

Conflicts of Interest

The authors declare no conflict of interest.

References

  1. Vitolina, S.; Shulga, G.; Neiberte, B.; Jaunslavietis, J.; Verovkins, A.; Betkers, T. Characteristics of the Waste Wood Biomass and Its Effect on the Properties of Wood Sanding Dust/Recycled PP Composite. Polymers 2022, 14, 468. [Google Scholar] [CrossRef] [PubMed]
  2. Antov, P.; Krišt’ák, L.; Réh, R.; Savov, V.; Papadopoulos, A.N. Eco-friendly fiberboard panels from recycled fibers bonded with calcium lignosulfonate. Polymers 2021, 13, 639. [Google Scholar] [CrossRef] [PubMed]
  3. Scaffaro, R.; Maio, A.; Sutera, F.; Gulino, E.F.; Morreale, M. Degradation and recycling of films based on biodegradable polymers: A short review. Polymers 2019, 11, 651. [Google Scholar] [CrossRef] [Green Version]
  4. Silva, A.L.P. Future-proofing plastic waste management for a circular bioeconomy. Curr. Opin. Environ. Sci. Health 2021, 22, 100263. [Google Scholar] [CrossRef]
  5. Dorieh, A.; Selakjani, P.P.; Shahavi, M.H.; Pizzi, A.; Movahed, S.G.; Pour, M.F.; Aghaei, R. Recent developments in the performance of micro/nanoparticle-modified urea-formaldehyde resins used as wood-based composite binders: A review. Int. J. Adhes. Adhes. 2022, 114, 103106. [Google Scholar] [CrossRef]
  6. Fonseca-García, A.; Jiménez-Regalado, E.J.; Aguirre-Loredo, R.Y. Preparation of a novel biodegradable packaging film based on corn starch-chitosan and poloxamers. Carbohydr. Polym. 2021, 251, 117009. [Google Scholar] [CrossRef]
  7. Ramesh, M.; Rajeshkumar, L.; Sasikala, G.; Balaji, D.; Saravanakumar, A.; Bhuvaneswari, V.; Bhoopathi, R. A Critical Review on Wood-Based Polymer Composites: Processing, Properties, and Prospects. Polymers 2022, 14, 589. [Google Scholar] [CrossRef]
  8. Dorieh, A.; Farajollah Pour, M.; Ghafari Movahed, S.; Pizzi, A.; Pouresmaeel Selakjani, P.; Valizadeh Kiamahalleh, M.; Hatefnia, H.; Shahavi, M.H.; Aghaei, R. A review of recent progress in melamine-formaldehyde resin based nanocomposites as coating materials. Prog. Org. Coat. 2022, 165, 106768. [Google Scholar] [CrossRef]
  9. Selakjani, P.P.; Dorieh, A.; Pizzi, A.; Shahavi, M.H.; Hasankhah, A.; Shekarsaraee, S.; Ashouri, M.; Movahed, S.G.; Abatari, M.N. Reducing free formaldehyde emission, improvement of thickness swelling and increasing storage stability of novel medium density fiberboard by urea-formaldehyde adhesive modified by phenol derivatives. Int. J. Adhes. Adhes. 2021, 111, 102962. [Google Scholar] [CrossRef]
  10. Mundel, R.; Thakur, T.; Chatterjee, M. Emerging uses of PLA–PEG copolymer in cancer drug delivery. 3 Biotech 2022, 12, 41. [Google Scholar] [CrossRef]
  11. Vlachopoulos, A.; Karlioti, G.; Balla, E.; Daniilidis, V.; Kalamas, T.; Stefanidou, M.; Bikiaris, N.D.; Christodoulou, E.; Koumentakou, I.; Karavas, E. Poly (Lactic Acid)-Based Microparticles for Drug Delivery Applications: An Overview of Recent Advances. Pharmaceutics 2022, 14, 359. [Google Scholar] [CrossRef]
  12. Abifarin, J.K.; Prakash, C.; Singh, S. Optimization and significance of fabrication parameters on the mechanical properties of 3D printed chitosan/PLA scaffold. Mater. Today Proc. 2021, 50, 2018–2025. [Google Scholar] [CrossRef]
  13. Młotek, M.; Gadomska-Gajadhur, A.; Sobczak, A.; Kruk, A.; Perron, M.; Krawczyk, K. Modification of PLA scaffold surface for medical applications. Appl. Sci. 2021, 11, 1815. [Google Scholar] [CrossRef]
  14. Fan, T.; Daniels, R. Preparation and characterization of electrospun polylactic acid (PLA) fiber loaded with birch bark triterpene extract for wound dressing. Aaps Pharmscitech 2021, 22, 1–9. [Google Scholar] [CrossRef]
  15. Liu, J.; Shi, R.; Hua, Y.; Gao, J.; Chen, Q.; Xu, L. A new cyanoacrylate-poly (lactic acid)-based system for a wound dressing with on-demand removal. Mater. Lett. 2021, 293, 129666. [Google Scholar] [CrossRef]
  16. Khosravi, A.; Fereidoon, A.; Khorasani, M.M.; Naderi, G.; Ganjali, M.R.; Zarrintaj, P.; Saeb, M.R.; Gutiérrez, T.J. Soft and hard sections from cellulose-reinforced poly (lactic acid)-based food packaging films: A critical review. Food Packag. Shelf Life 2020, 23, 100429. [Google Scholar] [CrossRef]
  17. Backes, E.H.; Pires, L.D.N.; Beatrice, C.A.G.; Costa, L.C.; Passador, F.R.; Pessan, L.A. Fabrication of biocompatible composites of poly (lactic acid)/hydroxyapatite envisioning medical applications. Polym. Eng. Sci. 2020, 60, 636–644. [Google Scholar] [CrossRef]
  18. Sin, L.T.; Rahmat, A.R.; Rahman, W.A.W.A. 3—Applications of Poly(lactic Acid). In Handbook of Biopolymers and Biodegradable Plastics, Ebnesajjad, S., Ed.; William Andrew Publishing: Boston, MA, USA, 2013; pp. 55–69. [Google Scholar]
  19. Alexandre, A.; Cruz Sanchez, F.A.; Boudaoud, H.; Camargo, M.; Pearce, J.M. Mechanical properties of direct waste printing of polylactic acid with universal pellets extruder: Comparison to fused filament fabrication on open-source desktop three-dimensional printers. 3D Print. Addit. Manuf. 2020, 7, 237–247. [Google Scholar] [CrossRef]
  20. Giorcelli, M.; Khan, A.; Pugno, N.M.; Rosso, C.; Tagliaferro, A. Biochar as a cheap and environmental friendly filler able to improve polymer mechanical properties. Biomass Bioenergy 2019, 120, 219–223. [Google Scholar] [CrossRef] [Green Version]
  21. Arrigo, R.; Bartoli, M.; Malucelli, G. Poly (lactic acid)–biochar biocomposites: Effect of processing and filler content on rheological, thermal, and mechanical properties. Polymers 2020, 12, 892. [Google Scholar] [CrossRef] [Green Version]
  22. Ebrahimpour, M.; Shahavi, M.H.; Jahanshahi, M.; Najafpour, G. Nanotechnology in Process Biotechnology: Recovery and Purification of Nanoparticulate Bioproducts Using Expanded Bed Adsorption. Dyn. Biochem. Process Biotechnol. Mol. Biol. 2009, 3, 57–60. [Google Scholar]
  23. Kuang, T.; Ju, J.; Liu, T.; Hejna, A.; Saeb, M.R.; Zhang, S.; Peng, X. A facile structural manipulation strategy to prepare ultra-strong, super-tough, and thermally stable polylactide/nucleating agent composites. Adv. Compos. Hybrid Mater. 2022. [Google Scholar] [CrossRef]
  24. Barczewski, M.; Hejna, A.; Aniśko, J.; Andrzejewski, J.; Piasecki, A.; Mysiukiewicz, O.; Bąk, M.; Gapiński, B.; Ortega, Z. Rotational molding of polylactide (PLA) composites filled with copper slag as a waste filler from metallurgical industry. Polym. Test. 2022, 106, 107449. [Google Scholar] [CrossRef]
  25. Scaffaro, R.; Maio, A.; Gulino, E.F.; Pitarresi, G. Lignocellulosic fillers and graphene nanoplatelets as hybrid reinforcement for polylactic acid: Effect on mechanical properties and degradability. Compos. Sci. Technol. 2020, 190, 108008. [Google Scholar] [CrossRef]
  26. Wolski, K.; Cichosz, S.; Masek, A. Surface hydrophobisation of lignocellulosic waste for the preparation of biothermoelastoplastic composites. Eur. Polym. J. 2019, 118, 481–491. [Google Scholar] [CrossRef]
  27. Singh, T.; Lendvai, L.; Dogossy, G.; Fekete, G. Physical, mechanical, and thermal properties of Dalbergia sissoo wood waste-filled poly (lactic acid) composites. Polym. Compos. 2021, 42, 4380–4389. [Google Scholar] [CrossRef]
  28. Moreno-Anguiano, O.; Cloutier, A.; Rutiaga-Quiñones, J.G.; Wehenkel, C.; Rosales-Serna, R.; Rebolledo, P.; Hernández-Pacheco, C.E.; Carrillo-Parra, A. Use of Agave durangensis Bagasse Fibers in the Production of Wood-Based Medium Density Fiberboard (MDF). Forests 2022, 13, 271. [Google Scholar] [CrossRef]
  29. Scussel, R.; Feltrin, A.C.; Angioletto, E.; Galvani, N.C.; Fagundes, M.Í.; Bernardin, A.M.; Feuser, P.E.; de Ávila, R.A.M.; Pich, C.T. Ecotoxic, genotoxic, and cytotoxic potential of leachate obtained from chromated copper arsenate-treated wood ashes. Environ. Sci. Pollut. Res. 2022, 1–14. [Google Scholar] [CrossRef]
  30. Raclavská, H.; Růžičková, J.; Juchelková, D.; Šafář, M.; Brťková, H.; Slamová, K. The quality of composts prepared in automatic composters from fruit waste generated by the production of beverages. Bioresour. Technol. 2021, 341, 125878. [Google Scholar] [CrossRef]
  31. Kannepalli, S.; Strom, P.F.; Krogmann, U.; Subroy, V.; Giménez, D.; Miskewitz, R. Characterization of wood mulch and leachate/runoff from three wood recycling facilities. J. Environ. Manag. 2016, 182, 421–428. [Google Scholar] [CrossRef]
  32. Zhu, Y.; Romain, C.; Williams, C.K. Sustainable polymers from renewable resources. Nature 2016, 540, 354–362. [Google Scholar] [CrossRef] [PubMed]
  33. Shahavi, M.H.; Esfilar, R.; Golestani, B.; Sadeghabad, M.S.; Biglaryan, M. Comparative study of seven agricultural wastes for renewable heat and power generation using integrated gasification combined cycle based on energy and exergy analyses. Fuel 2022, 317, 123430. [Google Scholar] [CrossRef]
  34. Kazemeini, H.; Azizian, A.; Shahavi, M.H. Effect of Chitosan Nano-Gel/Emulsion Containing Bunium Persicum Essential Oil and Nisin as an Edible Biodegradable Coating on Escherichia Coli O157:H7 in Rainbow Trout Fillet. J. Water Environ. Nanotechnol. 2019, 4, 343–349. [Google Scholar] [CrossRef]
  35. Maresca, A.; Krüger, O.; Herzel, H.; Adam, C.; Kalbe, U.; Astrup, T.F. Influence of wood ash pre-treatment on leaching behaviour, liming and fertilising potential. Waste Manag. 2019, 83, 113–122. [Google Scholar] [CrossRef]
  36. Berger, F.; Gauvin, F.; Brouwers, H. The recycling potential of wood waste into wood-wool/cement composite. Construct Build. Mater. 2020, 260, 119786. [Google Scholar] [CrossRef]
  37. Hosseini, M.; Shahavi, M.H.; Yakhkeshi, A. AC & DC-currents for separation of nano-particles by external electric field. Asian J. Chem. 2012, 24, 181–184. [Google Scholar]
  38. de Klerk, S.; Ghaffariyan, M.R.; Miles, M. Leveraging the Entrepreneurial Method as a Tool for the Circular Economy: The Case of Wood Waste. Sustainability 2022, 14, 1559. [Google Scholar] [CrossRef]
  39. Che, X.; Wu, M.; Yu, G.; Liu, C.; Xu, H.; Li, B.; Li, C. Bio-inspired water resistant and fast multi-responsive Janus actuator assembled by cellulose nanopaper and graphene with lignin adhesion. Chem. Eng. J. 2021, 433, 133672. [Google Scholar] [CrossRef]
  40. Pizzi, A. Bioadhesives for wood and fibres. Rev. Adhes. Adhes. 2013, 1, 88–113. [Google Scholar] [CrossRef]
  41. Gaff, M.; Kačík, F.; Gašparík, M. Impact of thermal modification on the chemical changes and impact bending strength of European oak and Norway spruce wood. Compos. Struct. 2019, 216, 80–88. [Google Scholar] [CrossRef]
  42. Mohammadi-Rovshandeh, J.; Pouresmaeel-Selakjani, P.; Davachi, S.M.; Kaffashi, B.; Hassani, A.; Bahmeyi, A. Effect of lignin removal on mechanical, thermal, and morphological properties of polylactide/starch/rice husk blend used in food packaging. J. Appl. Polym. Sci. 2014, 131, 41095. [Google Scholar] [CrossRef]
  43. Hwang, S.W.; Shim, J.K.; Selke, S.; Soto-Valdez, H.; Rubino, M.; Auras, R. Effect of Maleic-Anhydride Grafting on the Physical and Mechanical Properties of Poly (L-lactic acid)/Starch Blends. Macromol. Mater. Eng. 2013, 298, 624–633. [Google Scholar] [CrossRef]
  44. ASTM D3418-21; Standard Test Method for Transition Temperatures and Enthalpies of Fusion and Crystallization of Polymers by Differential Scanning Calorimetry. ASTM International: West Conshohocken, PA, USA, 2021. [CrossRef]
  45. ASTM D638-14; Standard Test Method for Tensile Properties Of Plastics. ASTM International: West Conshohocken, PA, USA, 2014; p. 18. [CrossRef]
  46. ASTM D256-10; Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics. ASTM International: West Conshohocken, PA, USA, 2018. [CrossRef]
  47. ASTM D2240-15; Standard Test Method for Rubber Property—Durometer Hardness. ASTM International: West Conshohocken, PA, USA, 2021. [CrossRef]
  48. Abatari, M.N.; Emami, M.R.S.; Jahanshahi, M.; Shahavi, M.H. Superporous pellicular κ-Carrageenan–Nickel composite beads; morphological, physical and hydrodynamics evaluation for expanded bed adsorption application. Chem. Eng. Res. Des. 2017, 125, 291–305. [Google Scholar] [CrossRef]
  49. Rad, A.S.; Shahavi, M.H.; Esfahani, M.R.; Darvishinia, N.; Ahmadizadeh, S. Are nickel- and titanium- doped fullerenes suitable adsorbents for dopamine in an aqueous solution? Detailed DFT and AIM studies. J. Mol. Liq. 2021, 322, 114942. [Google Scholar] [CrossRef]
  50. Pérez Quiñones, J.; Brüggemann, O.; Kjems, J.; Shahavi, M.H.; Peniche Covas, C. Novel brassinosteroid-modified polyethylene glycol micelles for controlled release of agrochemicals. J. Agric. Food Chem. 2018, 66, 1612–1619. [Google Scholar] [CrossRef] [PubMed]
  51. Jahanshahi, M.; Shahavi, M.H. Chapter 17—Advanced Downstream Processing in Biotechnology. In Biochemical Engineering and Biotechnology, 2nd ed.; Najafpour, G.D., Ed.; Elsevier: Amsterdam, The Netherlands, 2015; pp. 495–526. [Google Scholar]
  52. Sauerbier, P.; Köhler, R.; Renner, G.; Militz, H. Surface activation of polylactic acid-based wood-plastic composite by atmospheric pressure plasma treatment. Materials 2020, 13, 4673. [Google Scholar] [CrossRef]
  53. Lashkenari, A.S.; Najafi, M.; Peyravi, M.; Jahanshahi, M.; Mosavian, M.T.H.; Amiri, A.; Shahavi, M.H. Direct filtration procedure to attain antibacterial TFC membrane: A facile developing route of membrane surface properties and fouling resistance. Chem. Eng. Res. Des. 2019, 149, 158–168. [Google Scholar] [CrossRef]
  54. Shahavi, M.H.; Hosseini, M.; Jahanshahi, M.; Meyer, R.L.; Darzi, G.N. Clove oil nanoemulsion as an effective antibacterial agent: Taguchi optimization method. Desalination Water. Treat. 2016, 57, 18379–18390. [Google Scholar] [CrossRef]
  55. Halder, P.; Kundu, S.; Patel, S.; Parthasarathy, R.; Pramanik, B.; Paz-Ferreiro, J.; Shah, K. TGA-FTIR study on the slow pyrolysis of lignin and cellulose-rich fractions derived from imidazolium-based ionic liquid pre-treatment of sugarcane straw. Energy Convers. Manag. 2019, 200, 112067. [Google Scholar] [CrossRef]
  56. Hejna, A.; Barczewski, M.; Andrzejewski, J.; Kosmela, P.; Piasecki, A.; Szostak, M.; Kuang, T. Rotational molding of linear low-density polyethylene composites filled with wheat bran. Polymers 2020, 12, 1004. [Google Scholar] [CrossRef]
  57. Rahaman, M.N.; Brown, R.F. Materials for Biomedical Engineering: Fundamentals and Applications; John Wiley & Sons: Hoboken, NJ, USA, 2021. [Google Scholar]
  58. Davachi, S.M.; Bakhtiari, S.; Pouresmaeel-Selakjani, P.; Mohammadi-Rovshandeh, J.; Kaffashi, B.; Davoodi, S.; Yousefi, A. Investigating the effect of treated rice straw in PLLA/starch composite: Mechanical, thermal, rheological, and morphological study. Adv. Polym. Technol. 2018, 37, 5–16. [Google Scholar] [CrossRef]
  59. Börcsök, Z.; Pásztory, Z. The role of lignin in wood working processes using elevated temperatures: An abbreviated literature survey. Eur. J. Wood Wood Prod. 2021, 79, 511–526. [Google Scholar] [CrossRef]
  60. Park, C.-W.; Youe, W.-J.; Kim, S.-J.; Han, S.-Y.; Park, J.-S.; Lee, E.-A.; Kwon, G.-J.; Kim, Y.-S.; Kim, N.-H.; Lee, S.-H. Effect of lignin plasticization on physico-mechanical properties of lignin/poly (lactic acid) composites. Polymers 2019, 11, 2089. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  61. Ferrández-Montero, A.; Lieblich, M.; Benavente, R.; González-Carrasco, J.L.; Ferrari, B. Study of the matrix-filler interface in PLA/Mg composites manufactured by Material Extrusion using a colloidal feedstock. Addit. Manuf. 2020, 33, 101142. [Google Scholar] [CrossRef]
  62. Khan, T.A.; Lee, J.-H.; Kim, H.-J. Chapter 9—Lignin-Based Adhesives and Coatings. In Lignocellulose for Future Bioeconomy, Ariffin, H., Sapuan, S.M., Hassan, M.A., Eds.; Elsevier: Amsterdam, The Netherlands, 2019; pp. 153–206. [Google Scholar]
  63. Nofar, M.; Sacligil, D.; Carreau, P.J.; Kamal, M.R.; Heuzey, M.-C. Poly (lactic acid) blends: Processing, properties and applications. Int. J. Biol. Macromol. 2019, 125, 307–360. [Google Scholar] [CrossRef]
  64. Tang, J.; Li, L.; Wang, X.; Yang, J.; Liang, X.; Li, Y.; Ma, H.; Zhou, S.; Wang, J. Tailored crystallization behavior, thermal stability, and biodegradability of poly (ethylene adipate): Effects of a biocompatible diamide nucleating agent. Polym. Test. 2020, 81, 106116. [Google Scholar] [CrossRef]
  65. Spinelli, G.; Guarini, R.; Kotsilkova, R.; Ivanov, E.; Romano, V. Experimental, Theoretical and Simulation Studies on the Thermal Behavior of PLA-Based Nanocomposites Reinforced with Different Carbonaceous Fillers. Nanomaterials 2021, 11, 1511. [Google Scholar] [CrossRef]
  66. Tábi, T. The application of the synergistic effect between the crystal structure of poly (lactic acid)(PLA) and the presence of ethylene vinyl acetate copolymer (EVA) to produce highly ductile PLA/EVA blends. J. Therm. Anal. Calorim. 2019, 138, 1287–1297. [Google Scholar] [CrossRef] [Green Version]
  67. Vanaei, H.R.; Shirinbayan, M.; Costa, S.F.; Duarte, F.M.; Covas, J.A.; Deligant, M.; Khelladi, S.; Tcharkhtchi, A. Experimental study of PLA thermal behavior during fused filament fabrication. J. Appl. Polym. Sci. 2021, 138, 49747. [Google Scholar] [CrossRef]
  68. Kachur, K.; Suntres, Z. The antibacterial properties of phenolic isomers, carvacrol and thymol. Crit. Rev. Food Sci. Nutr. 2020, 60, 3042–3053. [Google Scholar] [CrossRef]
  69. Sonseca, A.; Madani, S.; Rodríguez, G.; Hevilla, V.; Echeverría, C.; Fernández-García, M.; Muñoz-Bonilla, A.; Charef, N.; López, D. Multifunctional PLA blends containing chitosan mediated silver nanoparticles: Thermal, mechanical, antibacterial, and degradation properties. Nanomaterials 2020, 10, 22. [Google Scholar] [CrossRef] [Green Version]
  70. Chong, W.J.; Shen, S.; Li, Y.; Trinchi, A.; Pejak, D.; Kyratzis, I.L.; Sola, A.; Wen, C. Additive manufacturing of antibacterial PLA-ZnO nanocomposites: Benefits, limitations and open challenges. J. Mater. Sci. Technol. 2022, 111, 120–151. [Google Scholar] [CrossRef]
Polymers 14 01227 g001 550
Figure 1. Structure of the main components of the wood leachate (WL) (a) phenol, and (b) lignin.
Figure 1. Structure of the main components of the wood leachate (WL) (a) phenol, and (b) lignin.
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Polymers 14 01227 g002 550
Figure 2. FTIR spectra of PLA and PLA-WL biocomposites.
Figure 2. FTIR spectra of PLA and PLA-WL biocomposites.
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Polymers 14 01227 g003 550
Figure 3. Stress–strain curves of tensile tests for neat PLA and PLA-WL biocomposites.
Figure 3. Stress–strain curves of tensile tests for neat PLA and PLA-WL biocomposites.
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Polymers 14 01227 g004 550
Figure 4. The DSC curves for PLA-WL biocomposites.
Figure 4. The DSC curves for PLA-WL biocomposites.
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Polymers 14 01227 g005a 550Polymers 14 01227 g005b 550
Figure 5. The SEM micrographs of the surface ((a) PLA and (b) PLA-WL-7 biocomposites), fracture surface ((c) PLA and (d) PLA-WL-7 biocomposites), and fracture surface of PLA-WL-9 in two different magnifications ((e) 1KX and (f) 10 KX).
Figure 5. The SEM micrographs of the surface ((a) PLA and (b) PLA-WL-7 biocomposites), fracture surface ((c) PLA and (d) PLA-WL-7 biocomposites), and fracture surface of PLA-WL-9 in two different magnifications ((e) 1KX and (f) 10 KX).
Polymers 14 01227 g005aPolymers 14 01227 g005b
Polymers 14 01227 g006 550
Figure 6. The contact angle images for fabricated biocomposites ((a) PLA and (b) PLA-WL-7).
Figure 6. The contact angle images for fabricated biocomposites ((a) PLA and (b) PLA-WL-7).
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Polymers 14 01227 g007 550
Figure 7. The antibacterial activity of the prepared biocomposites ((a) PLA and PLA-WL-3 and (b) PLA-WL-5, PLA-WL-7, and PLA-WL-9) against E. coli.
Figure 7. The antibacterial activity of the prepared biocomposites ((a) PLA and PLA-WL-3 and (b) PLA-WL-5, PLA-WL-7, and PLA-WL-9) against E. coli.
Polymers 14 01227 g007
Table
Table 1. Manufacturing parameters of PLA-WL biocomposites produced in this work.
Table 1. Manufacturing parameters of PLA-WL biocomposites produced in this work.
SamplePLA (%)WL (%)Mixing Temp (°C)Mixing Time (min)Sheet Thickness (mm)
PLA1000180153.4
PLA-WL-3973180153.6
PLA-WL-5955180153.7
PLA-WL-7937180153.5
PLA-WL-9919180153.9
Table
Table 2. The mechanical characteristics of the fabricated PLA-WL biocomposites.
Table 2. The mechanical characteristics of the fabricated PLA-WL biocomposites.
SampleTensile Strength (MPa)Elongation at Break (%)Elastic Modulus (MPa)Charpy Impact Strength (KJ/m2)Shore A Hardness
PLA33.954.00183738.6289.21
PLA-WL-358.658.80155346.2191.32
PLA-WL-5121.7516.73181762.4791.85
PLA-WL-7169.7518.93194274.5692.30
PLA-WL-966.9511.71142761.8486.21
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Shahavi, M.H.; Selakjani, P.P.; Abatari, M.N.; Antov, P.; Savov, V. Novel Biodegradable Poly (Lactic Acid)/Wood Leachate Composites: Investigation of Antibacterial, Mechanical, Morphological, and Thermal Properties. Polymers 2022, 14, 1227. https://doi.org/10.3390/polym14061227

AMA Style

Shahavi MH, Selakjani PP, Abatari MN, Antov P, Savov V. Novel Biodegradable Poly (Lactic Acid)/Wood Leachate Composites: Investigation of Antibacterial, Mechanical, Morphological, and Thermal Properties. Polymers. 2022; 14(6):1227. https://doi.org/10.3390/polym14061227

Chicago/Turabian Style

Shahavi, Mohammad Hassan, Peyman Pouresmaeel Selakjani, Mohadese Niksefat Abatari, Petar Antov, and Viktor Savov. 2022. "Novel Biodegradable Poly (Lactic Acid)/Wood Leachate Composites: Investigation of Antibacterial, Mechanical, Morphological, and Thermal Properties" Polymers 14, no. 6: 1227. https://doi.org/10.3390/polym14061227

APA Style

Shahavi, M. H., Selakjani, P. P., Abatari, M. N., Antov, P., & Savov, V. (2022). Novel Biodegradable Poly (Lactic Acid)/Wood Leachate Composites: Investigation of Antibacterial, Mechanical, Morphological, and Thermal Properties. Polymers, 14(6), 1227. https://doi.org/10.3390/polym14061227

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