ii series of polymers from dietherdianhydrides of arylene-di(benzene-5-ether-1,2-dicarboxylic) anhydride type and tetraamines: 3,3'-diaminobenzidine and 3,3',4,4'-tetraaminodiphenyl ether were synthesized using high and low temperature polycondensation. The polymers had a semiladder structure. The influence of the monomer structure on the polymer properties has been investigated.