Development of Polymer Adhesive from Renewable Resources

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Circular and Green Polymer Science".

Deadline for manuscript submissions: closed (25 August 2023) | Viewed by 3257

Special Issue Editor


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Guest Editor
LERMAB, Laboratoire d’Etude et de Recherche sur le MAteriau Bois, Université de Lorraine, 27 rue Philippe Seguin, CS60036, 88021 Epinal, France
Interests: polycondensation; resins; adhesives; thermosetting polymers for adhesives; natural polymers for industrial use; fibrous and wood composites; polymeric wood constituents (cellulose, lignin, tannins)
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Special Issue Information

Dear Colleagues, 

Polymer adhesives are a fundamental specialty of modern life. Many products used today are bonded with adhesives and used in aeronautics, electronics, timber, medical and dental applications and many others. While adhesives in general have reached a high level of sophistication and effectiveness, this field of research is still constantly evolving. The progressively stricter environmental and government regulations on synthetics, as well as the realization that the oil from which many adhesives are derived has only a limited future supply, has led to research focused on adhesives derived from natural resources. The last decade has seen a considerable surge in research activity on adhesives from an endless variety of renewable resources, and this incredible growth is only intensifying. Some of these adhesives have already started to find their place in the industrial market, and their market share, although still relatively small, is constantly growing. This polymer science constitutes an essential aspect of the green and circular economy.

This Special Issue is focused on collated cutting-edge original research and review articles on the preparation and application of polymer adhesives from renewable resources.

Prof. Dr. Antonio Pizzi
Guest Editor

Manuscript Submission Information

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Keywords

  • adhesives
  • renewable resources
  • green polymer science
  • bonding applications
  • natural materials
  • bio-sources
  • applications
  • manufacturing
  • formulation
  • preparation

Published Papers (2 papers)

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Research

19 pages, 5411 KiB  
Article
The Potential of Visible Spectroscopy as a Tool for the In-Line Monitoring of Lignin Methylolation
by Sofia Gonçalves, Jorge Martins, Nádia T. Paiva, Diana Paiva, Luísa H. Carvalho and Fernão D. Magalhães
Polymers 2023, 15(1), 178; https://doi.org/10.3390/polym15010178 - 30 Dec 2022
Viewed by 1256
Abstract
Out of the 50 to 70 million tons of lignin that are produced annually, only 1 to 2% are used for value-added products. Currently, 90% of the total market of this compound corresponds to lignosulphonates (LS). The most successful industrial attempts to use [...] Read more.
Out of the 50 to 70 million tons of lignin that are produced annually, only 1 to 2% are used for value-added products. Currently, 90% of the total market of this compound corresponds to lignosulphonates (LS). The most successful industrial attempts to use lignin for wood adhesives rely on using it as a partial substitute in phenol–formaldehyde or urea–formaldehyde resins. However, lignin’s aromatic ring presents a low number of reactive sites. Several methods have been proposed to improve its reactivity, such as prior methylolation with formaldehyde. Off-line methods are commonly applied to monitor this reaction’s progress, but this introduces a significant delay in the analysis. This study proposes a new method for in-line monitoring of the methylolation reaction using visible spectroscopy. In order to monitor the reaction progress, principal component analysis was applied to the spectra, and the obtained scores were analyzed. When these results were plotted against those obtained by the off-line methods, a satisfactory regression was obtained at 50 °C (R2 = 0.97) and 60 °C (R2 = 0.98) for two different LS samples. Therefore, it was concluded that visible spectroscopy is a promising technique for studying lignin methylolation. Full article
(This article belongs to the Special Issue Development of Polymer Adhesive from Renewable Resources)
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13 pages, 3416 KiB  
Article
Protein Adhesives: Investigation of Factors Affecting Wet Strength of Alkaline Treated Proteins Crosslinked with Glyoxal
by Elena Averina, Johannes Konnerth and Hendrikus W. G. van Herwijnen
Polymers 2022, 14(20), 4351; https://doi.org/10.3390/polym14204351 - 15 Oct 2022
Cited by 2 | Viewed by 1281
Abstract
Proteins obtained as side-products from starch production (potato and corn proteins) were investigated for wood adhesives application. To improve the wet strength of protein-based adhesives, glyoxal was added as a crosslinking agent. The effect of glyoxal on the wet strength of protein-based adhesives [...] Read more.
Proteins obtained as side-products from starch production (potato and corn proteins) were investigated for wood adhesives application. To improve the wet strength of protein-based adhesives, glyoxal was added as a crosslinking agent. The effect of glyoxal on the wet strength of protein-based adhesives was investigated at different pH, protein: glyoxal ratios and solid content. The alkaline pretreatment of proteins was carried out by two different methods which reduced the molecular weight of proteins to different extents. The effect of molecular weight reduction on the wet strength of protein-glyoxal adhesives was also observed. It was found that pH level affects wet strength more significantly compared to solid content and protein-to-crosslinker ratio. Potato and corn proteins crosslinked with glyoxal showed maximal wet strength results in an acidic pH range Full article
(This article belongs to the Special Issue Development of Polymer Adhesive from Renewable Resources)
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