带过氧键侧基的大分子过氧化物的热分解行为  

STUDY ON THERMAL DECOMPOSITION BEHAVIOR OF POLYMERIC PEROXIDES

作　　者：俞强[1] 林明德[1] 李坚[1] 

机构地区：[1]江苏石油化工学院化工系,江苏常州213016

出　　处：《高分子材料科学与工程》2003年第5期134-137,共4页Polymer Materials Science & Engineering

基　　金：江苏省自然科学基金资助项目(BK99115)

摘　　要：用示差扫描量热法研究了1-(2-叔丁基过氧异丙基)-3-异丙烯基苯与苯乙烯、丙烯酸甲酯单体共聚后所得大分子过氧化物的热稳定性以及分解动力学。发现大分子过氧化物的热稳定性明显高于单体过氧化物,而且随共聚物中过氧基团含量的下降,大分子过氧化物的稳定性进一步提高。大分子过氧化物的等温分解呈一级反应,其分解速率常数与共聚物中过氧键含量以及分解温度有关。大分子过氧化物的分解活化能在110kJ/mol～115kJ/mol范围,低于相应D120单体过氧化物的139.2kJ/mol。The thermal stabilities and the decomposition kinetics of the copolymers of tbutyl3isopropenylcumylperoxide (D120) with styrene and/or methyl acrylate monomers were studied using differential scanning calorimetry. It was found that the thermal stability of the pendant peroxide groups was substantially increased after copolymerization and further improved with the decrease of D120 units in the copolymers. The character of first order kinetics was observed regarding the isothermal decomposition of the polymeric peroxides. Decomposition rate constants were related with the contents of D120 units in the copolymers and also depended on decomposition temperatures. The apparent activation energies for the decomposition of polymeric peroxides were between 110 kJ/mol and 115 kJ/mol, lower than that of D120 monomer peroxide (139.2 kJ/mol).

关 键 词：过氧键侧基 大分子过氧化物 热分解行为 热稳定性 分解动力学 苯乙烯 丙烯酸甲酯 1-(2-叔丁基过氧异丙基)-3-异丙烯基苯 

分 类 号：O631.31[理学—高分子化学]