聚酯及其电解质的热稳定性

以酯交换反应合成了聚丁二酸酯系列,与高氯酸锂制成固体电解质。通过对聚酯及其电解质的热失重分析,将其热分解进行了动力学处理,结果表明这一系列聚酯分解温度相近,与链节单元长度无关;聚酯电解质的热稳定性比聚酯差,且随无机盐含量提高而降低。利用色-质谱联用技术,剖析了聚酯及其固体电解质的分解产物,提出了它们各自的分解机理。

Thermal Stability of Polyesters and Their Electrolytes

A series of poly alkylene succinate was synthesized by ester exchange reactions and the solid electrolytes were made from the polyesters and lithium perchlorate. Thermal decomposition of the polymers and their electrolytes was explored with thermal gravimetric analysis and their kinetics of thermal decomposition is studied. The results show that the decomposition temperature for the polyesters is nearly the same and is not related to the length of the chain units; thermal stability of polyester electrolytes is worse than that of the polyester and decreases with the increase of salt concentration in the electrolytes. The pyrolytic fragments of poly (tetramethylene succinate) and its electrolyte were determined with GC/MS combined technique. The decomposed products of the polymer are different from those of its electrolyte. Finally, the separate decomposition mechanisms for the polyester and its electrolyte are suggested in this article.