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Polyurethane Wood Adhesives Prepared from Modified Polysaccharides
Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology. Linnaeus University, Linnaeus Knowledge Environments, Advanced Materials. Linnaeus University, Linnaeus Knowledge Environments, Green Sustainable Development. (Group of Forest Products)ORCID iD: 0000-0003-0883-2306
University of the Basque Country UPV/EHU, Spain.ORCID iD: 0000-0001-6471-9215
2022 (English)In: Polymers, E-ISSN 2073-4360, Vol. 14, no 3, article id 539Article in journal (Refereed) Published
Sustainable development
SDG 9: Build resilient infrastructure, promote inclusive and sustainable industrialization, and foster innovation, SDG 12: Ensure sustainable consumption and production patterns, SDG 15: Protect, restore and promote sustainable use of terrestrial ecosystems, sustainably manage forests, combat desertification, and halt and reverse land degradation and halt biodiversity loss
Abstract [en]

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.

Place, publisher, year, edition, pages
MDPI, 2022. Vol. 14, no 3, article id 539
National Category
Wood Science Polymer Chemistry
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
URN: urn:nbn:se:lnu:diva-109991DOI: 10.3390/polym14030539ISI: 000916060700001Scopus ID: 2-s2.0-85123455785OAI: oai:DiVA.org:lnu-109991DiVA, id: diva2:1633712
Funder
Swedish Research Council Formas, 2018-00637Available from: 2022-01-31 Created: 2022-01-31 Last updated: 2024-01-17Bibliographically approved

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Hosseinpourpia, RezaAdamopoulos, Stergios

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