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Polyurethane Wood Adhesives Prepared from Modified Polysaccharides

This study investigated the performance of polyurethane adhesives prepared with various combinations of wheat starch that had been modified by isophorone diisocyanate (MS), two polyol types (1,3-propanediol (PD) and glycerol (Gly)), native wheat starch (NS), and 4,4′-diphenylmethane diisocyanate (pM...

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Autores principales: Hosseinpourpia, Reza, Eceiza, Arantxa, Adamopoulos, Stergios
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8840148/
https://www.ncbi.nlm.nih.gov/pubmed/35160530
http://dx.doi.org/10.3390/polym14030539
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author Hosseinpourpia, Reza
Eceiza, Arantxa
Adamopoulos, Stergios
author_facet Hosseinpourpia, Reza
Eceiza, Arantxa
Adamopoulos, Stergios
author_sort Hosseinpourpia, Reza
collection PubMed
description This study investigated the performance of polyurethane adhesives prepared with various combinations of wheat starch that had been modified by isophorone diisocyanate (MS), two polyol types (1,3-propanediol (PD) and glycerol (Gly)), native wheat starch (NS), and 4,4′-diphenylmethane diisocyanate (pMDI) at a NCO:OH weight ratio of 1:1. Two more adhesives were also synthesized with NS, PD, or Gly and pMDI blends and served as controls. The thermal behavior of the adhesives before and after the curing process, as well as their rheological performance and lap shear strength, were analyzed. Differential scanning calorimetry (DSC) showed a reduction in curing temperature and heat by adding MS. The thermal stability of the cured adhesives was slightly increased by MS addition. The viscosity of the adhesives that contained MS substantially increased at a linear ascendant ramp of shear, while the controls exhibited relatively low viscosity during the whole shear rate spectrum from 0.1 to 100 s(−1). The tensile shear strength of wood veneers was also significantly increased by the incorporation of MS under both dry and wet measuring conditions. The maximum dry shear strength was obtained for the adhesive with Gly polyol and a higher content of MS and was comparable to the control adhesive with pMDI.
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spelling pubmed-88401482022-02-13 Polyurethane Wood Adhesives Prepared from Modified Polysaccharides Hosseinpourpia, Reza Eceiza, Arantxa Adamopoulos, Stergios Polymers (Basel) Article This study investigated the performance of polyurethane adhesives prepared with various combinations of wheat starch that had been modified by isophorone diisocyanate (MS), two polyol types (1,3-propanediol (PD) and glycerol (Gly)), native wheat starch (NS), and 4,4′-diphenylmethane diisocyanate (pMDI) at a NCO:OH weight ratio of 1:1. Two more adhesives were also synthesized with NS, PD, or Gly and pMDI blends and served as controls. The thermal behavior of the adhesives before and after the curing process, as well as their rheological performance and lap shear strength, were analyzed. Differential scanning calorimetry (DSC) showed a reduction in curing temperature and heat by adding MS. The thermal stability of the cured adhesives was slightly increased by MS addition. The viscosity of the adhesives that contained MS substantially increased at a linear ascendant ramp of shear, while the controls exhibited relatively low viscosity during the whole shear rate spectrum from 0.1 to 100 s(−1). The tensile shear strength of wood veneers was also significantly increased by the incorporation of MS under both dry and wet measuring conditions. The maximum dry shear strength was obtained for the adhesive with Gly polyol and a higher content of MS and was comparable to the control adhesive with pMDI. MDPI 2022-01-28 /pmc/articles/PMC8840148/ /pubmed/35160530 http://dx.doi.org/10.3390/polym14030539 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Hosseinpourpia, Reza
Eceiza, Arantxa
Adamopoulos, Stergios
Polyurethane Wood Adhesives Prepared from Modified Polysaccharides
title Polyurethane Wood Adhesives Prepared from Modified Polysaccharides
title_full Polyurethane Wood Adhesives Prepared from Modified Polysaccharides
title_fullStr Polyurethane Wood Adhesives Prepared from Modified Polysaccharides
title_full_unstemmed Polyurethane Wood Adhesives Prepared from Modified Polysaccharides
title_short Polyurethane Wood Adhesives Prepared from Modified Polysaccharides
title_sort polyurethane wood adhesives prepared from modified polysaccharides
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8840148/
https://www.ncbi.nlm.nih.gov/pubmed/35160530
http://dx.doi.org/10.3390/polym14030539
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