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Research article - Peer-reviewed, 2022

Polyurethane wood adhesives prepared from modified polysaccharides

Hosseinpourpia, Reza; Eceiza, Arantxa; Adamopoulos, Stergios

Abstract

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.

Keywords

polyurethane adhesive; wheat starch; pMDI; isocyanate chemistry; wood adhesive

Published in

Polymers
2022, volume: 14, number: 3, article number: 539

Authors' information

Hosseinpourpia, Reza
Linnaeus University
Eceiza, Arantxa
University of the Basque Country
Swedish University of Agricultural Sciences, Department of Forest Biomaterials and Technology

UKÄ Subject classification

Wood Science

Publication Identifiers

DOI: https://doi.org/10.3390/polym14030539

URI (permanent link to this page)

https://res.slu.se/id/publ/115824