在酰胺-盐溶剂体系中对苯二甲酰氯与对苯二胺的缩聚反应

本文研究了在酰胺-盐溶剂体系中对苯二胺与对苯二甲酰氯的缩聚反应,溶剂对缩聚反应的影响以及溶剂体系与对苯二甲酰氯的副反应。由NMR实验结果表明,聚对苯二甲酰对苯二胺分子中酰胺基团的氢质子由于溶剂化作用向低场方向位移,位移的大小与溶剂的种类及盐的浓度有关。DMAc与NMP两种溶剂体系在缩聚反应过程中皆与对苯二甲酰氟有竞争反应。在该溶剂体系中可得到适于加工成纤的高分子量聚合物。

STUDIES ON THE POLYCONDENSATION OF TERE- PHTHALOYL CHLORIDE AND p-PHENYLENEDI- AMINE IN AMIDE-SALT SYSTEM

The polycondensation of p-phenylenediamine and terephthaloyl chloride in amide solvent system has been studied. In order to obtain high molecular weight poly (1,4-phenyleneterephthalamide) (PPTA), the solvation of PPTA with the solvents and the competitive side reaction of the solvents with terephthaloyl chloride in amide-salt system were investigated.We can observed from NMR data, the proton resonance of the amide group of these model compounds shifts markedly to lower field due to the effect of solvation. The magnitude of these shifts depends on the kind of solvent and the concentration of the salt used. DMAc and NMP are the solvents which react with terephthaloyl chloride comptitively in the polycondensation process.