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Sustainable Lignocellulosic Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Green Materials".

Deadline for manuscript submissions: closed (21 November 2023) | Viewed by 4252

Special Issue Editors


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Guest Editor
1. Faculty of Wood Engineering and Creative Industry, University of Sopron, 9400 Sopron, Hungary
2. Fiber and Nanotechnology Program, University of Sopron, 9400 Sopron, Hungary
Interests: wood and wood-based products; biocomposites; natural fiber; lignocellulosic material defibration; natural fiber modifications; cementitious products; green synthesis of nanoparticles
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Faculty of Wood Engineering and Creative Industry, University of Sopron, 9400 Sopron, Hungary
Interests: wood and wood-based products; glued wooden structures; non-destructive testing of wood
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
1. Faculty of Wood Engineering and Creative Industry, University of Sopron, 9400 Sopron, Hungary
2. Fiber and Nanotechnology Program, University of Sopron, 9400 Sopron, Hungary
Interests: wood and wood-based products; biocomposites; natural fiber; defibration; natural fiber modifications; green synthesis of nanoparticles
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Wood and wood-based products are considered the most significant renewable source of lignocellulosic material abundantly available in Nature. They are widely used for sustainable structural and building materials instead of traditional steel and concrete products. However, natural fibers are also defibrated from wood particles, and can be used for green insulation and plastic composite material production. The particles obtained from softwoods and hardwoods are another important source of lignocellulosic materials used for sustainable particle board manufacturing. Different thermosetting, thermoplastic, and cementitious polymers are used for the production of wood-based products and the development and manufacturing of composites. Recently, multiple hard woods, barks, and leaves have been used for metallic nanoparticle synthesis, adding a new dimension to green chemistry and physics as well. Furthermore, a variety of waste woods and industrial byproducts are excellent sources of sustainable lignocellulosic raw materials. The developed products are used for producing furniture, building and construction, packaging, bioplastics (aeronautics, defense, transportation vehicles, biomedicine, automotive, shipbuilding, etc.), and so on. In some cases, nanoparticles are also used to improve the thermomechanical and physical properties of the developed products. However, there is still a long way to go for sustainable lignocellulosic products to replace the traditional nonbiodegradable products made of steel, glass, carbon, and so on, due to the lack of efficient technology and production protocols. Hopefully, this Special Issue will play a significant role in overcoming such challenges in the coming times.

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but are not limited to) the following:

  • Wood and wood-based products;
  • Biocomposites;
  • Natural fiber;
  • Defibration;
  • Sustainable cementitious products;
  • Natural fiber modifications;
  • Green synthesis of nanoparticles;
  • Recycling of wood-based products;
  • Vegetable fibers and associated products;
  • Cultivation and harvesting of plants;
  • Industrial biproducts and uses;
  • Numerous biopolymers and their uses;
  • Application of wood and wood-based products;
  • Application of vegetable fibers and associated products;
  • Glued wooden structures;
  • Non-destructive testing of wood.

We look forward to receiving your contributions.

You may choose our Joint Special Issue in Sustainability.

Dr. Tibor László Alpár
Dr. Laszlo Bejo
Dr. K. M. Faridul Hasan
Guest Editors

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • wood and plant materials
  • vegetable fibers
  • lignocellulosic raw materials
  • biocomposites
  • biopolymers
  • industrial by-products
  • recycling
  • thermomechanical performances
  • new material synthesis
  • sustainable products

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Published Papers (3 papers)

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Research

18 pages, 9595 KiB  
Article
Synthesis and Characterization of Cellulose Microfibril-Reinforced Polyvinyl Alcohol Biodegradable Composites
by Fatemeh Mahdiyeh Boroujeni, Gabriella Fioravanti and Ronald Kander
Materials 2024, 17(2), 526; https://doi.org/10.3390/ma17020526 - 22 Jan 2024
Cited by 8 | Viewed by 1585
Abstract
The pursuit of an environmentally sustainable manufacturing process requires the substitution of less damaging and recyclable solutions for harmful reagents. This study aims to assess the effectiveness of using cellulose microfibrils synthesized via different hydrolysis reactions as reinforcing agents in polyvinyl alcohol (PVA) [...] Read more.
The pursuit of an environmentally sustainable manufacturing process requires the substitution of less damaging and recyclable solutions for harmful reagents. This study aims to assess the effectiveness of using cellulose microfibrils synthesized via different hydrolysis reactions as reinforcing agents in polyvinyl alcohol (PVA) at varying concentrations. The investigation explores the morphology, thermal properties, and chemical behavior of the cellulose particles. The cellulose microfibrils (CMFs) produced using citric acid exhibited the highest yield and aspect ratio. Notably, particles from organic acids demonstrated greater thermal stability, with oxalic acid-derived particles displaying the maximum thermal degradation temperature. Subsequently, cast films of PVA reinforced with the cellulose microfibrils underwent comprehensive analyses, including Fourier transfer infrared (FTIR) spectroscopy, thermal degradation temperature (Td), differential scanning calorimetry (DSC), and tensile strength tests. The thermal behavior of cast films experienced notable changes with the addition of cellulose particles, evidenced by increased melting and crystallinity temperatures, along with a rise in the degree of crystallinity. The incorporation of cellulose particles led to a substantial improvement in mechanical properties. Films containing CMF displayed higher Young’s modulus, and the sample incorporating 5% CMF derived from citric acid exhibited the most significant increase in modulus. Full article
(This article belongs to the Special Issue Sustainable Lignocellulosic Materials)
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13 pages, 3344 KiB  
Article
The Bending Properties of Hybrid Cross-Laminated Timber (CLT) Using Various Species Combinations
by Ahmed Altaher Omer Ahmed, József Garab, Erika Horváth-Szováti, János Kozelka and László Bejó
Materials 2023, 16(22), 7153; https://doi.org/10.3390/ma16227153 - 14 Nov 2023
Cited by 1 | Viewed by 1227
Abstract
Cross-laminated timber (CLT) has become a massive commercial success in recent years due to its high performance, technological advantages, and low environmental impact. The finite softwood raw material supply has motivated researchers to find alternatives. This study presents an investigation of the viability [...] Read more.
Cross-laminated timber (CLT) has become a massive commercial success in recent years due to its high performance, technological advantages, and low environmental impact. The finite softwood raw material supply has motivated researchers to find alternatives. This study presents an investigation of the viability of some Hungarian hardwood materials, such as CLT materials. Homogeneous beech, poplar, and spruce panels, as well as their combinations, were created using a polyurethane adhesive. The experimental results show the clear potential of Hungarian poplar, which performed much better than spruce. Poplar’s modulus of elasticity (MOE) and modulus of rupture (MOR) values reached or exceeded those of high-grade commercial softwood CLT. The bending properties of beech and hybrid beech–poplar panels far exceeded the performance of commercial panels, which shows the excellent potential of high-density hardwoods for high-performance CLT production. Beech–spruce hybrid panels seriously underperformed. This was caused by gluing issues, probably due to the large density differences between the two species, as evidenced by the glueline failure exhibited by most of these specimens during testing. The average panel density proved to be the best predictor of mechanical performance, except for beech–spruce hybrid panels. Full article
(This article belongs to the Special Issue Sustainable Lignocellulosic Materials)
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15 pages, 3096 KiB  
Article
Effect of Reducing the Size and Number of Faces of Polyhedral Specimen on Wood Characterization by Ultrasound
by Cinthya Bertoldo, Geise Aparecida Pereira and Raquel Gonçalves
Materials 2023, 16(13), 4870; https://doi.org/10.3390/ma16134870 - 7 Jul 2023
Viewed by 897
Abstract
The complete characterization of wood, with the determination of the 12 elastic constants that represent its orthotropy, is greatly relevant in applications employing structural calculation software programs. Ultrasound allows for such characterization with relative simplicity when compared to other methods. The polyhedron is [...] Read more.
The complete characterization of wood, with the determination of the 12 elastic constants that represent its orthotropy, is greatly relevant in applications employing structural calculation software programs. Ultrasound allows for such characterization with relative simplicity when compared to other methods. The polyhedron is considered the most appropriate specimen format for allowing the 12 constants to be calculated with a single specimen, and the traditionally used one is the 26-sided polyhedron, which, to be produced manually with more precision in directing the main directions of the wood, needs larger faces. The accuracy of this technique tends to be reduced when increasing the growth rings’ inclination since the waves deviate from the main directions of orthotropy. This research aimed to verify whether it is possible to reduce the polyhedra dimension without affecting the results of the elastic parameters obtained in wood characterization by ultrasound. The results indicate that the dimension of the polyhedron can be reduced without prejudice to the results of the elastic parameters obtained by the ultrasound test and that, in the manual production process of the specimen, the best way to make this reduction is to eliminate the faces unused in the test, changing the polyhedron to 18 faces instead of 26. Reducing the number of faces simplifies the manufacturing process and thus increases the possibility of producing specimens with straighter growth rings and better-directed symmetry axes. Full article
(This article belongs to the Special Issue Sustainable Lignocellulosic Materials)
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