Non-Isocyanate polyurethane from the extracted tannin of sumac leaves: Synthesis, characterization, and optimization of the reaction parameters

The extracted tannin from Sumac leaves (Rhus coriaria L.) as a bioresource was utilized for Non-isocyanate Polyurethanes (NIPUs) synthesis. The extracted tannin pre-reacted with dimethyl carbonate. Subsequently, NIPUs were synthesized via the reaction of carbonated tannin with hexamethylene diamine. The condition of the reaction was optimized for different parameters including tannin/DMC weight ratio, reaction time, and reaction temperature by...