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用4,4'-二氨基二苯醚作为第三单体与对苯二甲酰氯、对苯二胺共缩聚得到共聚酰胺,并对它在浓硫酸中的稳定性进行了研究。研究了降解动力学,得到了共聚酰胺在不同温度、第三单体不同含量、不同序列结构以及硫酸不同浓度下的降解规律。结果表明,降解过程共聚物的对数比浓粘度的倒数与降解时间成线性关系,在较低温度、较低第三单体含量、分子含有较长PPTA链段以及硫酸浓度接近100%时,共聚酰胺在浓硫酸中的稳定性最好。
With 4,4’-diaminodiphenyl ether as the third monomer and terephthaloyl chloride, p-phenylenediamine copolycondensation to obtain copolyamide, and its stability in concentrated sulfuric acid was studied. The degradation kinetics was studied. The degradation of copolyamides at different temperatures, different contents of the third monomer, different sequence structures and different concentrations of sulfuric acid were obtained. The results showed that the logarithm of the logarithmic specific viscosity of the copolymer degraded linearly with the degradation time. At lower temperatures, the lower third monomer content, the longer PPTA segment of the molecule, and the sulfuric acid concentration near 100% The copolyamide has the best stability in concentrated sulfuric acid.