The demand for high thermal stability and high strength agents is growing steadily as a result of their increasing application in advanced materials. A series of sulfonated poly(m-phenyleneisophthalamide) (SPMIA) copolymers with superior thermal stability and good mechanical properties have been prepared via low temperature polycondensation method. Then the structures of SPMIA copolymers with different content quantities of 2,4-diaminobenzenesulfonic acid (2,4-DABSA) were confirmed by Fourier transform infrared (FTIR). Besides, their superior thermal properties were systematically investigated by differential scanning calorimetry (DSC), thermalgravimetreic analysis (TGA), and dynamic mechanical analysis (DMA). SPMIA fibers were obtained by wet spinning using the resultant SPMIA solutions. In addition, the obtained SPMIA fibers were proved to combine enhanced mechanical properties and unprecedented dyeability. Significantly, the SPMIA fiber with great mechanical property, thermal stability, and dyeability shows great potential in easily dyeing high-performance protective fibers.

由于其在先进材料中的越来越多的应用，对高热稳定性和高强度剂的需求正在稳步增长。一系列磺化聚（米-phenyleneisophthalamide）（SPMIA）具有优异的热稳定性和良好的机械性能的共聚物已经制备通过低温缩聚法。然后通过傅立叶变换红外光谱（FTIR）确定了不同含量的2,4-二氨基苯磺酸（2,4-DABSA）的SPMIA共聚物的结构。此外，还通过差示扫描量热法（DSC），热重分析（TGA）和动态力学分析（DMA）系统研究了它们的优异热性能。使用所得的SPMIA溶液通过湿纺获得SPMIA纤维。另外，证明所获得的SPMIA纤维具有增强的机械性能和空前的可染性。值得注意的是，具有良好机械性能，热稳定性和可染性的SPMIA纤维在容易染色高性能保护纤维方面显示出巨大潜力。