AROMATIC THERMOTROPIC LIQUID-CRYSTALLINE POLYMERS FROM 4-AMINOPHENOXY)-ALPHA,ALPHA-DIMETHYLBENZYL]BENZENE

Polymers were synthesized with 4-aminophenoxy)-alpha,alpha-dimethylben zyl]benzene by polycondensation of pyromellitic dianhydride (PMDA), ph thaloyl chlorides and trimellic anhydride chloride (TAC). Their possib le use as aromatic thermotropic liquid crystalline polymers was invest igated. The polyamide from terephthaloyl chloride (TPC), and the copol yamideimide from PMDA and TPC, showed thermotropic liquid crystalline properties according to the results of differential scanning calorimet ry and observations from polarization microscopy. However, neither the polyamide from isophthaloyl chloride nor the polyamideimide from TAC exhibited liquid crystalline properties. (C) 1997 Elsevier Science Ltd .