低温溶液缩聚法制备间位芳香族聚酰胺的研究

Study on Preparation of Poly (m-Phenyleneisophthalamide) by the Method of Low-temperature Solution Polycondensation

采用低温溶液缩聚的方法将间苯二胺(MPD)和间苯二甲酰氯(IPC)在N,N′-二甲基乙酰胺(DMAC)中进行缩聚,制得了较高重均相对分子质量的间位芳香族聚酰胺树脂。研究了聚合度与反应时间的关系,并对影响缩聚的各种因素如:单体浓度、起始反应温度、两种单体的摩尔比进行了研究,还对制得的浆液的稳定性进行了观察。

Poly(m-phenyleneisophthalamide) with relatively high inherent viscosity was prepared by the method of low-temperature-solution condensation polymerization. The effect of polymerization time, monomer concentration, IPC/MPD mole ratio and initial reaction temperature on the molecular weight of polymer was studied. The stability of resulted PMIA dope was also observed. The optimal reactivity condition is monomer concentration of 0.8～1.1 mol/L, initial reactor temperature under -10℃, the IPC/MPD mole ratio of 1.002～1.004, the polymerization time of 1～1.5 h.