POLYIMIDINES .6. COMPARISON OF POLYIMIDINES FROM BIS(3,3-DIPHENYL-6-PHTHALIDYL) KETONE

In the reported experiments, new thermally stable polyimidines have been synthesized from bis(3,3-diphenyl-6-phthalidyl) ketone and five diamines: o-phenylenediamine, m-phenylenediamine, 1,5-diaminonapthalene, 1,8-diaminonapthalene, and benzidine. Polymers of low molecular weight (inherent viscosity up to 0. 24 dl/g) were obtained by solution and sealed-tube polymerizations. The structural differences of the amines provided information concening the effects on the thermal stability properties of the resulting polyimidines. The yellow to black polymers exhibited a 10% loss ranging from 420-510 degree C in air and 460-555 degree C in nitrogen and were soluble in chloroform and dimethylformamide.