Synthesis of Three Novel Aromatic Biazomethine Liquid-Crystalline Epoxy Resins and Curing Reaction with Aromatic Diamine

Three class of novel liquid crystalline epoxy resins containing azomething groups: N,N'-Bis[4-(2,3-epoxypropoxy)benzylidene]-4,4-diamino-diphenyl ether (p-BEPBDDE), N,N'-Bis[4-(2,3-epoxypropoxy)benzylidene]-4,4-diamino-diphenyl methane (p-BEPBDDM) and N,N'-Bis[(4-(2,3-epoxypropoxy)-benzyliden)-1,4- phenylene diamine] (p-BEPBPD) were synthesized and characterized. The results show that p-BEBDDE and p-BEBDDM belong to smectic texture and melting point is 239.5 and 178 degrees C, respectively. The p-BEPBD is nematic texture between its melting temperature (Tm) of 192 degrees C and clearing temperature (Ti) of 238 degrees C. The curing reaction can be described by Ozawa equation, and the alcohol-hydroxyl group can accelerate the curing reaction and decrease Ea in DSC experiment.