Xinyi Chen1,2, Antonio Pizzi1,*, Xuedong Xi1,2, Xiaojian Zhou2, Emmanuel Fredon1, Christine Gerardin3
Journal of Renewable Materials, Vol.9, No.6, pp. 1045-1057, 2021, DOI:10.32604/jrm.2021.015066
Abstract Soy-protein isolate (SPI) was used to prepare non-isocyanate polyurethane (NIPU) thermosetting adhesives for
wood panels by reacting it with dimethyl carbonate (DMC) and hexamethylene diamine. Both linear as well
as branched oligomers were obtained and identified, indicating how such oligomer structures could further
cross-link to form a hardened network. Unusual structures were observed, namely carbamic acid-derived
urethane linkages coupled with lactam structures. The curing of the adhesive was followed by thermomechanical
analysis (TMA). It appeared to follow a two stages process: First, at a lower temperature (maximum 130°C), the
growth of linear oligomers occurred, finally forming a physically entangled network.… More >
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