with a significant reduction in molecular weight. The thermal degradation of PAAG-n was examined by thermogravimetric analysis combined with IR and NMR spectroscopy. At low temperatures (<300°C) decomposition was found to take place by depolymerization with releasing of the corresponding alkyl pyroglutamate. Decarboxylation of PAAG-n to an unsaturated polyamide seemed to be the main process occurring at
由微
生物来源的聚(γ-谷
氨酸)(
PGGA)经两步合成程序制备了一系列聚(α-烷基γ-谷
氨酸烷基酯)(P
AAG- n,n = 1-10)。首先通过
PGGA的酯化反应获得聚(α-乙基γ-谷
氨酸),然后与所选的链烷醇进行酯交换反应,得到相应的P
AAG- n。发现修饰反应在不改变原始对映体组成的情况下发生,但是分子量显着降低。P
AAG- n的热降解通过热重分析结合IR和NMR光谱进行检测。发现在低温(<300℃)下,通过解聚发生分解并释放出相应的焦谷
氨酸烷基酯。P
AAG- n脱羧成不饱和聚酰胺似乎是高温(400–450°C)下发生的主要过程。