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在N-甲基吡咯烷酮——氯化钙溶剂体系中,对苯二甲酰氯与对苯二胺低温溶液缩聚时,加入吡啶类添加剂,可以提高聚对苯二甲酰对苯二胺的分子量。本文讨论了不同结构的添加剂,添加剂的用量、添加方式、氯化钙含量及其与吡啶的关系、单体配比、单体浓度等因素对聚合体对数比浓粘度的关系,存在一个较佳的反应条件区域。当氯化钙含量在7—10％时,只要加入少量添加剂,就能大幅度地提高聚合体的粘度。
In the N-methylpyrrolidone-calcium chloride solvent system, terephthalic acid chloride and p-phenylenediamine solution polycondensation, the addition of pyridine additives, can improve the molecular weight of polyparaphenylene terephthalamide. This article discusses the different structures of additives, the amount of additives, adding mode, the content of calcium chloride and its relationship with pyridine, monomer ratio, monomer concentration and other factors on the relationship between the polymer logarithmic viscosity, there is a more Good reaction conditions area. When the calcium chloride content of 7-10%, as long as adding a small amount of additives, can greatly improve the viscosity of the polymer.