| Abstract: | A series of new high molecular weight soluble ester phenyl-as-triazine and ester phenyl-quinoxaline polymers were prepared by solution cyclopolycondensation of oxalamidrazone or 3,3′-diaminobenzidine, respectively, with various bis(benzilyl)esters. Ester groups are incorporated within the backbone of the polymer chain and also as pendant groups on the heterocyclic ring. By TGA in air, initial weight losses for the all-aromatic polyester phenyl-as-triazines and polyester phenylquinoxalines began at ca. 350 and 400°C, respectively. Films of ester phenyl-as-triazine and ester phenylquinoxaline polymers exhibited good thermo-oxidative stability after aging in circulating air at 232 and 288°C, respectively. Two phenylquinoxaline model compounds were also prepared. |
