通过L-丙氨酸与均苯四甲酸二酐的缩合反应得到手性酰亚胺,再与二苯基甲烷二异氰酸酯（MDI）聚合制备出基于L-丙氨酸的手性聚酰胺酰亚胺。用傅立叶红外光谱仪（FT-IR）,核磁共振（1H-NMR）表征了聚合物的结构。用差示扫描量热法（DSC）和热重分析（TG）研究了共聚物的结晶性能和热稳定性,同时对聚合物的溶解性能进行了探讨。研究表明,实验达到了预期目标,熔点Tm为357.6℃,失重5%的分解温度Td5为215℃,表明具有良好的耐热性能。常温下能溶于N-甲酰二甲胺,二甲基乙酰胺,二甲基亚砜,N-甲基吡咯烷酮,表明具有优异的溶解性能。
The chiral imide was synthesized through the condensation reaction of the L-alanine and pyromellitic dianhydride,and then reacted with 4,4′-diphenylmethane diisocyanate to form L-alanine based chiral polyamide-imide.The structure of the polymers was studied by Fourier transform infrared spectrometer and nuclear magnetic resonance.The crystallization and thermal stability of the polymer were studied using differential scanning calorimetry and thermo gravimetric analyzer.By the same time,the dissolution properties of polymer can be discussed.Experimental results show that to achieve the desired goal,the melting point Tm is 357.6 ℃,mass loss 5% of the decomposition temperature is 215 ℃,the product has good thermal stability.At room temperature the product can be dissolved in N,N-dimethylformamide,dimethylacetamide,dimethyl sulfoxide,N-methyl-2-pyrrolidone,showing excellent solubility.
参考文献
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