NMP/助溶剂体系中含氯对位芳香族聚酰胺的合成与表征

Synthesis and Characterization of Chlorinated Poly(para-phenylene terephthanlamide)in NMP/Consolvent System

采用低温溶液缩聚法将对苯二甲酰氯(TPC)和邻氯对苯二胺(Cl-PPD)在N-甲基吡咯烷酮(NMP)/助溶剂体系中进行缩聚反应,制备了较高相对分子质量的含氯对位芳香族聚酰胺(ClPPTA)树脂,并用傅里叶变换红外光谱对Cl-PPTA分子结构进行了表征.研究了Cl-PPD浓度、初始反应温度、助溶剂加入量、TPC和Cl-PPD的单体摩尔比、反应时间等因素对Cl-PPTA比浓对数黏度的影响,获得了较优的聚合条件.结果发现,NMP/LiCl体系相对于NMP/CaCl2体系更易获得相对分子质量较高的Cl-PPTA,最佳条件下可制得比浓对数黏度达2.38dL/g的Cl-PPTA.

Chlorinated poly（para-phenylene terephthanlamide）（Cl-PPTA） with relatively high molecular weight was synthesized by low-temperature solution polycondensation between 2-chloro-1,4-diaminobenzene（Cl-PPD）and terephthaloyl chloride（TPC）in N-methyl-2-pyrrolidone（NMP）/consolvent system.The molecular structure of Cl-PPTA was characterized by Fourier transform infrared spectroscopy（FTIR）.The effects of the concentration of Cl-PPD,initial reaction temperature,cosolvent content,molar ratio of TPC to Cl-PPD and reaction time on the inherent viscosity of Cl-PPTA were investigated.The optimum polymerization conditions were obtained.The results show that it is much easier to get higher molecular weight of Cl-PPTA in NMP/LiCl system than that in NMP/CaCl2 system.The Cl-PPTA with inherent viscosity of 2.38 dL/g can be produced under the optimum condition.