对苯二甲酰氯与N-甲基吡咯烷酮反应机理以及对聚对苯二甲酰对苯二胺聚合的影响  

Reaction Mechanism of Terephthaloyl Chloride/N-Methyl-2-pyrrolidone and the Effect on Poly(p-phenylene terephthalamide) Polymerization

作　　者：郭澄龙[1] 许甲[1] 王力慧[1] 庹新林[1] 王罗新[2] 

机构地区：[1]清华大学化工系高分子研究所先进材料教育部重点实验室,北京00084 [2]武汉纺织大学材料科学与工程学院,武汉430200

出　　处：《有机化学》2014年第6期1132-1137,共6页Chinese Journal of Organic Chemistry

基　　金：国家重点基础研究发展计划(973计划;No.2011CB606102)资助项目~~

摘　　要：稳定合成高分子量聚对苯二甲酰对苯二胺(PPTA)树脂是生产高性能芳纶纤维的基础.在PPTA聚合过程中,以单体对苯二甲酰氯(TPC)/N-甲基吡咯烷酮(NMP)溶液与单体对苯二胺(PPD)/NMP溶液进行溶液缩聚反应是最理想高效的方式,但是因为TPC/NMP间未知的相互作用导致这种聚合方式难以实现.通过实验与计算模拟相结合的方式,利用红外光谱(FTIR)、核磁共振(1H NMR)、飞行时间质谱及示差扫描量热分析对TPC/NMP间的反应进行了分析,并通过分子模拟计算证明TPC与NMP会发生类似Vilsmeier-Haack反应,导致TPC上的酰氯基团失活,从而严重影响其聚合反应活性.最后,通过PPTA聚合实验验证了该结论的正确性.Stable synthesis of high molecular weight of poly（p-phenylene terephthalamide）（PPTA） resin is the basis for the production of high-performance aramid fibers. In PPTA polymerization process, the feeding method of the monomer terephthaloyl chloride（TPC） has important influence on the molecular weight. In theory, using TPC/N-methyl-2-pyrrolidone（NMP） solution and monomer p-phenylene diamine（PPD）/NMP solution for solution polycondensation is the most ideal and effective way, but in real polymerization process, it is difficult to synthesize high molecular weight PPTA due to some unknown interaction between TPC and NMP. This article combines experiments and molecular stimulation together, using Frontier infrared spectroscopy（FTIR）, 1H NMR, the time of flight mass spectrometer（TOF-MS） and differential scanning calorimetric analysis（DSC）, analyzing the reaction between TPC and NMP, and verified that TPC and NMP has obvious reaction similar to Vilsmeier-Haack reaction through molecular stimulation, which may cause the chloride group on the TPC deactivating, and seriously influence its reactivity. And the conclusion is verified through PPTA polymerization experiments, and the longer TPC/NMP solution is prepared, the worse of the polymerization effect is. These observations and experiments suggest that it is not feasible to synthesize high molecular weight PPTA in industry using TPC/NMP solution feeding method.

关 键 词：PPTA TPC/NMP Vilsmeier-Haack反应 分子模拟 

分 类 号：O631.5[理学—高分子化学]