二氧化碳共聚物PPC-PCHC与同系共混物PPC/PCHC的热稳定性研究  

STUDY ON THERMAL STABILITY OF CO_2-BASED COPOLYMER PPC-PCHC AND ITS CORRESPONDING BLEND PPC/PCHC

作　　者：全志龙[1] 

机构地区：[1]华侨大学材料科学与工程学院,厦门361021

出　　处：《工程塑料应用》2010年第5期55-58,共4页Engineering Plastics Application

摘　　要：以差热扫描量热法和热重分析法研究了二氧化碳共聚物与同系共混物的热稳定性。结果表明,聚碳酸丙撑酯(PPC)-聚碳酸环己撑酯(PCHC)中含有PC富相链段和环己撑酯(CHC)富相链段,相分离现象明显;另外随着CHC结构单元含量的增加,PPC-PCHC的最大热分解温度从263.8℃提高到320.1℃,而共混物PPC/PCHC的热降解过程分步完成。Kissinger method研究显示,随着CHC结构单元含量的增加,PPC-PCHC热降解反应的表观活化能先增大后减小;Chang method的热降解动力学研究表明,PPC、PCHC、PPC-PCHC、PPC/PCHC的热降解反应级数分别为0、0、0.5和1。Differential scanning calorimetry （DSC） and thermogravimetry （TGA） were used to evaluate the thermal stability of copolymer PPC-PCHC and its corresponding blend PPC/PCHC. The results showed that the PPC-PCHC was composed of CHC-rich molecules chains as well as PC-rich molecules chains, and the thermal stability was dependent on the copolymer structure. With higher CHC ratio in PPC-PCHC, the thermal degradation temperature increased from 263.8℃ to 320. 1℃. Otherwise, the corresponding blend PPC/PCHC showed a complex degradation proceeding. The Ea of the CO2-based copolymers were determined by Kissinger method, and Chang method showed that the reaction order of PPC, PCHC, PPC-PCHC and PPC/PCHC were 0, 0, 0.5 and 1, respectively.

关 键 词：二氧化碳共聚物 热降解 KISSINGER METHOD Chang METHOD 

分 类 号：TQ334.9[化学工程—橡胶工业]