High-performance epoxy hybrid non-isocyanate polyurethanes prepared from diol-cyclocarbonation bisphenol A dicyclocarbonate

A new synthesis route different from convenient epoxy/CO2 method was established to synthesize a five-membered dicyclocarbonate of bisphenol A (BisA-5dCC), and its hybrid non-isocyanate polyurethanes with epoxy resins (HNIPUs) were reported. Bisphenol A was first reacted with 3-chloro-1,2propanediol to prepare a bisphenol A tetraol (BisA-4OH), and then was reacted with excess diethyl carbonate to obtain BisA-5dCC. Three polyhydroxyurethanes with H2N-terminal groups (PHUs) were synthesized from the aminolysis polyaddition of BisA-5dCC and excess hexanediamine. The PHUs were crosslinked with 1,4-butanediol diglycidyl ether and bisphenol A diglycidyl ether, respectively, and different HNIPUs were prepared. The structures of BisA-4OH, BisA-5dCC, and PHUs were confirmed, and the HNIPUs were characterized by Fourier transform infrared, differential scanning calorimetry, dynamic mechanical analysis, thermogravimetric analysis, and tensile tests. HNIPUs prepared from aromatic epoxy showed higher Tg (up to 81 degrees C) and better tensile strength (as high as 60MPa) than those from aliphatic epoxy. High-performance HNIPUs with excellent thermal and mechanical properties were successfully synthesized.