DMDPB在聚合物中的热分解行为  

Behavior of Thermal Decomposition of DMDPB in Polymer Matrix

作　　者：俞强[1] 林明德[1] 丁永红[1] 何明阳[2] 

机构地区：[1]江苏石油化工学院材料科学与工程系,江苏常州213016 [2]江苏石油化工学院

出　　处：《江苏石油化工学院学报》2002年第4期54-57,共4页Journal of Jiangsu Institute of Petrochemical Technology

摘　　要：使用示差扫描量热方法对2,3-二甲基-2,3-二苯基丁烷(DMDPB)在聚合物基体中的热分解行为进行了研究。实验发现DMDPB在聚合物基体中的分解温度低于纯DMDPB的分解温度;DMDPB等温分解时起始速率最大,随后以指数形式衰减,表现出一级分解反应的特征。DMDPB分解速率常数随DMDPB含量增加略有增加。在HDPE基体中DMDPB的分解活化能为20kJ/mol左右,远低于过氧或偶氮类自由基引发剂的分解活化能。由于DMDPB非常慢的分解速率以及自由基的弱脱氢能力,DMDPB在HDPE和EPDM基体中分解反应后没有导致聚合物形成凝胶。The behavior of thermal decomposition of 2,3-dimethyl-2,3- diphenylbutane (DMDPB),dispersed in polymer matrix was studied using differential scanning calorimetry (DSC).It was found that the decomposition temperature of DMDPMB in HDPE and/or EPDM matrix was much lower than that of pure DMDPB.When decomposed isothermally in HDPE matrix,the fastest decomposition rate of DMDPB was observed in the beginning of the decomposition processes,and then it slowed down with the feature of the first-order kinetics.The decomposition rate constants of DMDPB in HDPE/DMDPB system increased slightly with the DMDPB contents.The apparent activation energy for the decomposition of DMDPB in HDPE matrix was about 20kJ/mol, much lower than those of peroxide or azo radical initiators.The gels were not found within the reaction products of HDPE and/or EPDM with DMDPB as a crosslinking agent,which could be attributed to the lower decomposition rate of DMDPB and the weaker dehydrogenation capability of DMDPB radicals from the polymer chains.

关 键 词：DMDPB 聚合物 热分解行为 2 3-二甲基-2 3-二苯基丁烷 分解动力学 示差扫描量热 聚乙烯 乙丙橡胶 

分 类 号：O631.22[理学—高分子化学]