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Efficient synthesis of bio-based poly(amide urethane)s via non-isocyanate route
von Elodie Hablot, Dan Graiver, Ramani Narayan
A novel bio-based, isocyanate-free poly(amide urethane) derived from soy dimer acids is described. Three steps are involved in this one-pot synthesis; first, dimer fatty acids are condensed with ethylene diamine to produce amine terminated oligomers intermediates. These intermediates are then reacted in a second step with ethylene carbonate to yield hydroxyl terminated di-urethanes, which then undergo a transurethane polycondensation to produce high molecular weight polymers. The structure and properties of the intermediates and products were investigated by FITR, GPC as well as hydroxyl value, acid value, and amine value. The number average molecular weight of these poly(amide urethane)s was 8,000 g/mol with a Tg and Tm of –10 °C and 73 °C, respectively. The polymers were stable up to 230 °C.