摘要
采用热失重方法(TG)研究了端羟基超支化聚酯和端羟基改性超支化聚酯在氮气气氛中的热稳定性及分解行为。端羟基超支化聚酯的热分解过程包括酯基降解和碳碳键断裂2个阶段,随着代数增加,热稳定性有所改善。当端羟基被烷烃链取代后,端羟基超支化聚酯的热分解温度大幅度提高。低代数端羟基改性超支化聚酯的分解以碳碳键断裂为主,高代数热分解仍包括酯基降解和碳碳键断裂2个阶段。端羟基改性超支化聚酯的表观分解活化能明显提高。
Gravimetric analysis （TG） was used to study the thermal stability and degradation behavior of hydroxyl-ended hyperbranched polyesters（HBPE） and end-group modified hyperbranched polyesters（MHBPE） in nitrogen atmosphere. The thermal degradation process of HBPE is composed of two stages, the ester group degradation, and the C-C bond fragmentation. With the increase of generations, thermal stability of HBPE is improved. The thermal decomposition temperature increases greatly after hydroxyl end groups are replaced by alkane chains. The decomposotion of MHBPE with low generations is mainly contributed by C-C bond fragmentation, while the decomposition process of high generations of MHBPE is still divided into two stages, ester group degradation and C-C bond fragmentation. The apparent decomposition activation energy of MHBPE is much higher than that of the corresponding HBPE.
出处
《现代塑料加工应用》
CAS
北大核心
2012年第1期12-15,共4页
Modern Plastics Processing and Applications
关键词
超支化聚酯
端羟基改性
热稳定性
分解行为
hyperbranched polyesters
end-groups modification
thermastability
degradation behavior
