Non-Isocyanate-Based Polyurethanes Derived upon the Reaction of Amines with Cyclocarbonate Resins

摘要

Laprolate-803 (L-803) was used as the model Cyclocarbonate resin for reactivity and kinetic studies of non-isocyanate-based solventless polyurethanes derived upon the reaction of amines with the l,3-dioxolan-2-one (dioxolanone) rings of L-803. It was shown that the reaction could undergo either acid-, base- or metal-type catalysis yielding polyurethanes with 100% conversion of the dioxolanone rings at approximately half the time needed for their uncatalyzed counterparts. The activation energy of the reaction of L-803 with diethylene triamine in the presence or absence of a catalyst was determined via Arhenious studies. The reactivity of amines towards the aforementioned model resin was correlated to their chemical structure. A model non-isocyanate-based polyurethane displayed T_g of -1°C (DMA), fast gel time (390 min) at room temperature and good elongation (～70%).