Biodegradable isocyanate-free polyurethane films a noncatalytic route: facile modified polycaprolactone triol and biobased diamine as precursors.

A facile synthesis of isocyanate free polyurethanes (PU) was executed by the reaction of biodegradable cyclic carbonate and sustainable diamines generated chemical modification. The biodegradable polyol polycaprolactone triol (PCL) was transformed into a new glycerol carbonate derivative, PCL-(COOGC), and subjected to polyaddition with the diamines linalool diamine (LLDA), isosorbide diamine (ISODA) and hexamethylene diamine (HDA). Polyaddition of PCL-(COOGC) with the above diamine precursors was conducted a one-pot reaction under catalyst-free reaction conditions prior to film casting.