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Research and Application Progress of Wood Adhesives

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

Deadline for manuscript submissions: closed (31 July 2024) | Viewed by 6812

Special Issue Editors


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Guest Editor
Department of Wood Science and Thermal Techniques, Faculty of Forestry and Wood Technology, Poznan University of Life Sciences, Wojska Polskiego 28, 60-637 Poznan, Poland
Interests: wood technology; adhesives and lacquer products; wood based materials; technology; non-wooden materials
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E-Mail Website
Guest Editor
Department of Wood Science and Thermal Techniques, Poznan University of Life Sciences, Wojska Polskiego 28, 60-637 Poznan, Poland
Interests: wood technology; lacquer products and adhesives; wood based materials; UV technology; wood finishing; wood gluing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In recent years, a continuous growth can be observed in the frame of adhesives and resins for the woodworking industry. Investigations concerning environmentally friendly products have been carried out, and proecological adhesives have been used for gluing not only wood but also composites and modified wood.

Adhesives or resins that are used for gluing have not always shown high thermoresistance and/or water resistance of glue lines, e.g., by gluing modified wood. The bonding characteristic of modified wood becomes a complex issue due to the large diversity of wood species, adhesives, and modification methods (chemical, thermal, etc.). The drying time of the binder increases a few times compared to unmodified wood. Sometimes, problems occur with gluability, and surface shoulds be activated using different methods or tools, e.g., plasma treatment or adhesion promoters.

This Special Issue will serve as a forum for exchanging novel research ideas and application progress in the different groups of wood adhesives. Emphasis in this Special Issue is placed on the properties of adhesives, gluability of modified or activated wood and wood-based composites, and the strength and durability of glue lines.

It is our pleasure to invite you to submit a manuscript to this Special Issue. Full papers and reviews are all welcome.

Dr. Tomasz Krystofiak
Dr. Barbara Lis
Guest Editors

Manuscript Submission Information

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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

  • proecological adhesives
  • polyvinyl acetate (PVAc) adhesives
  • hot melt (HM) adhesives
  • polyurethane (PUR) adhesives
  • upholstery adhesives
  • epoxy resins
  • polycondensation resins
  • gluing
  • surface activation of wood and wood-based materials
  • adhesion promoter
  • plasma surface treatment
  • gluability of modified wood species and wood-based composites
  • wettability of wood and wood-based materials and their treated surfaces
  • strength and durability of glue lines
  • additives for bonding agents

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Published Papers (4 papers)

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Research

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12 pages, 2162 KiB  
Article
Effect of Residue Acrylic Monomers in Synthesized Solvent-Free Photoreactive Pressure-Sensitive Adhesives on the Main Properties of Transfer Tapes Applied to Joining Wooden Elements
by Zbigniew Czech, Marcin Bartkowiak and Tomasz Krystofiak
Materials 2023, 16(24), 7563; https://doi.org/10.3390/ma16247563 - 8 Dec 2023
Cited by 1 | Viewed by 904
Abstract
This publication describes the influence of residue monomers in synthesized pressure-sensitive adhesives based on acrylics on their main properties—tack, peel adhesion, shear strength and shrinkage—in the form of transfer tapes used for joining wooden elements in the furniture industry. The discussed carrier-free adhesive [...] Read more.
This publication describes the influence of residue monomers in synthesized pressure-sensitive adhesives based on acrylics on their main properties—tack, peel adhesion, shear strength and shrinkage—in the form of transfer tapes used for joining wooden elements in the furniture industry. The discussed carrier-free adhesive tapes are synthesized via photo-crosslinking and photopolymerization with UV radiation of the photoreactive prepolymers sandwiched between two adhesive siliconized polyester films. The simultaneous crosslinking and polymerization processes carried out under UV lamps placed simultaneously above and below the crosslinked photoreactive polymer layer lead to the production of a carrier-free adhesive film. The preliminary target of these studies was to investigate how the intensity of UV radiation and the time of its exposure affect the viscosity of the photoreactive compositions and the content of unreacted monomers in them. Next, the influence of the crosslinking agent concentration and UV irradiation time on the content of unreacted monomers after the crosslinking process was tested. The last step of the studies was the investigation of the influence of the residue monomer concentration on the application properties of the obtained pressure-sensitive adhesive layers. The typical PSA application properties were tested on the wood samples: tack, peel adhesion, shear strength (cohesion) and shrinkage. Full article
(This article belongs to the Special Issue Research and Application Progress of Wood Adhesives)
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14 pages, 2731 KiB  
Article
Studying the Wettability and Bonding Properties of Acetylated Hornbeam Wood Using PVAc and PUR Adhesives
by Fanni Fodor and Miklós Bak
Materials 2023, 16(5), 2046; https://doi.org/10.3390/ma16052046 - 1 Mar 2023
Cited by 2 | Viewed by 1541
Abstract
The present study aimed to determine how acetylation affected the bonding properties of European hornbeam wood. The research was supplemented with the investigation of wetting properties, wood shear strength, and microscopical studies of bonded wood, as these all have strong relationships with wood [...] Read more.
The present study aimed to determine how acetylation affected the bonding properties of European hornbeam wood. The research was supplemented with the investigation of wetting properties, wood shear strength, and microscopical studies of bonded wood, as these all have strong relationships with wood bonding. Acetylation was carried out on an industrial scale. Acetylated hornbeam showed a higher contact angle and lower surface energy than untreated hornbeam. Although the adhesion of the acetylated wood surface is lower due to its lower polarity and porosity, the bonding strength of acetylated hornbeam was similar to that of untreated hornbeam when bonded with PVAc D3 adhesive, and it was higher in the case of PVAc D4 and PUR adhesives. Microscopical studies proved these findings. After acetylation, hornbeam could be used in applications where it is exposed to moisture, as its bonding strength after soaking or boiling in water was significantly higher than that of untreated hornbeam. Full article
(This article belongs to the Special Issue Research and Application Progress of Wood Adhesives)
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15 pages, 3905 KiB  
Article
Investigations on the Characterization of Various Adhesive Joints by Means of Nanoindentation and Computer Tomography
by Arkadiusz Bernaczyk, André Wagenführ, Robert Zboray, Alexander Flisch, Thomas Lüthi, Birgit Vetter, Mario Rentsch, Christian Terfloth, Jörg Lincke, Tomasz Krystofiak and Peter Niemz
Materials 2022, 15(23), 8604; https://doi.org/10.3390/ma15238604 - 2 Dec 2022
Cited by 4 | Viewed by 1494
Abstract
The mechanical properties of cured wood adhesive films were tested in a dry state by means of nanoindentation. These studies have found that the application of adhesives have an effect on the accuracy of the hardness and elastic modulus determination. The highest values [...] Read more.
The mechanical properties of cured wood adhesive films were tested in a dry state by means of nanoindentation. These studies have found that the application of adhesives have an effect on the accuracy of the hardness and elastic modulus determination. The highest values of hardness among the tested adhesives at 20 °C have condensation resins: MF (0.64 GPa) and RPF (0.52 GPa). Then the decreasing EPI (0.43 GPa), PUR (0.23 GPa) and PVAc (0.14 GPa) adhesives. The values of the elastic modulus look a little bit different. The highest values among the tested adhesives at 20 °C have EPI (11.97 GPa), followed by MF (10.54 GPa), RPF (7.98 GPa), PVAc (4.71 GPa) and PUR (3.37 GPa). X-ray micro-computed tomography was used to evaluate the adhesive joint by the determination of the voids. It has been proven that this value depends on the type of adhesive, glue quantity and reactivity. The highest values of the void ratio achieve the PUR (17.26%) adhesives, then PVAc (13.97%), RRF (6.88%), MF (1.78%) and EPI (0.03%). The ratio of the gaps increases with the higher joint thickness. A too high proportion of voids may weaken the adhesive joint. Full article
(This article belongs to the Special Issue Research and Application Progress of Wood Adhesives)
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Review

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15 pages, 1018 KiB  
Review
Utilization of Plant Oils for Sustainable Polyurethane Adhesives: A Review
by Żaneta Ciastowicz, Renata Pamuła and Andrzej Białowiec
Materials 2024, 17(8), 1738; https://doi.org/10.3390/ma17081738 - 10 Apr 2024
Cited by 1 | Viewed by 1625
Abstract
The utilization of plant oils as a renewable resource for the production of polyurethane adhesives presents a promising way to improve sustainability and reduce environmental impact. This review explores the potential of various vegetable oils, including waste oils, in the synthesis of polyurethanes [...] Read more.
The utilization of plant oils as a renewable resource for the production of polyurethane adhesives presents a promising way to improve sustainability and reduce environmental impact. This review explores the potential of various vegetable oils, including waste oils, in the synthesis of polyurethanes as an alternative to conventional petroleum-based raw materials. The investigation highlights the environmental challenges associated with conventional polyurethane production and highlights the benefits of switching to bio-renewable oils. By examining the feasibility and potential applications of vegetable oil-based polyurethanes, this study emphasizes the importance of further research and development in this area to realize the full potential of sustainable polyurethane adhesives. Further research and development in this area are key to overcoming the challenges and realizing the full potential of plant-oil-based polyurethanes in various industrial applications. Full article
(This article belongs to the Special Issue Research and Application Progress of Wood Adhesives)
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