Co-condensation type polyamides were prepared by using1,2-dihydro-2-(4-aminophenyl)-4- [4-(4-aminophenoxyl) phenyl]-phthalazin-1-one and 4,4′-diamino biphenyl ether or 4,4′-diamino biphenyl methane as the co-diamine monomers and aromatic diacid as the co-condensation monomer. The polyamides were observed to be soluble in strong polar solvents only when the molar ratio of 1,2- dihydro-2- (4-aminophenyl)-4-[4-(4-aminophenoxyl) phenyl]-phthalazin- 1-one and 4,4′-diamino biphenyl ether or 4,4′-diamino biphenyl methane was 10∶0～5∶5. The intrinsic viscosity of soluble polyamides in NMP was observed to be 0.91～1.43 dL/g. The thermal decomposition temperature (5%) of soluble polyam ides in N2 was observed to be about 450 ℃ and almost independent of the struc ture and molar ratio of the co-diamine monomers studied.%采用1,2-二氢-2-(4-氨基苯基)-4-[4-(4-氨基苯氧基)-苯基]-二氮杂萘-1-酮(A)、4,4′-二氨基二苯醚(B)、4,4′-二氨基二苯甲烷(C)为共缩聚二胺单体与对苯二甲酸进行共缩聚反应,制备共缩聚型聚酰胺.当A与B或C的物质的量比为10∶0～5∶5时,所得聚酰胺溶于强极性溶剂,在NMP中的特性粘度为0.91～1.43dL/g.它们的玻璃化转变温度均高于300℃,具有优异的耐热性能,在氮气中5%的热失重温度为450℃左右,并且在研究范围内与共聚二胺的结构及比例无关.
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