新型手性聚酰胺酰亚胺的合成及其性能研究

Synthesis and Properties of Novel Chiral Poly(amide-imide)

L-丙氨酸与均苯四甲酸二酐反应制得手性二酸单体(1);1与4,4'-二氨基二苯醚经溶液缩聚合成了一种新型的主链含手性结构的聚酰胺酰亚胺(2),其结构经1H NMR和IR表征。并利用UV,荧光光谱和TGA研究了2的光学性质和热稳定性,结果表明,2的最大吸收波长位于267.5 nm;最大发射波长位于348 nm;2的5%热失重温度超过280℃。2在常温下溶于N-甲基吡咯烷酮等极性非质子试剂。

A novel chiral poly（amide-imide）（2） was synthesized by the solution polycondensation of 4,4′-diamino diphenyl ether and chiral diacid（1） which was prepared from L-alanine with pyromellitic dianhydride.The structures and properties were characterized by UV,1H NMR,IR,fluorescence spectrum and TGA.The results showed that the maximum absorbant wavelength and the maximum emission wavelength of 2 was 267.5 nm and 348 nm,respectively.Decomposition temperature was above 280 ℃ at weight loss 5%,and 2 was soluble in polar aprotic solvents such as NMP at room temperature.