Elham Azadeh1, Antonio Pizzi1,2,*, Christine Gerardin-Charbonnier1,*, Philippe Gerardin1
Journal of Renewable Materials, Vol.11, No.6, pp. 2823-2848, 2023, DOI:10.32604/jrm.2023.027651
Abstract Non-isocyanate polyurethane (NIPU) foams from a commercial hydrolysable tannin extract, chestnut wood
tannin extract, have been prepared to determine what chemical species and products are taking part in the
reactions involved. This method is based on two main steps: the reaction with dimethyl carbonate and the
formation of urethane bonds by further reaction of the carbonated tannin with a diamine-like hexamethylene
diamine. The hydroxyl groups on the tannin polyphenols and on the carbohydrates intimately linked with it
and part of a hydrolysable tannin are the groups involved in these reactions. The carbohydrate skeleton of the
hydrolysable tannin is also able… More >
Graphic Abstract
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