摘要
以马来酸酐作为改性剂,在稀土异戊橡胶聚合末期对其进行接枝改性,制备了马来酸酐接枝异戊橡胶.通过傅里叶变换红外光谱表征了接枝产物的结构,并推测了相应的改性反应机理.采用直接滴定法测试了产物的接枝率和反应的接枝效率.结果表明,在异戊橡胶的聚合溶剂己烷中,以过氧化氢对?烷作为引发剂的反应活性要优于偶氮二异丁腈和过氧化苯甲酰,马来酸酐与异戊橡胶的接枝反应遵循自由基机理.在该高黏度溶液接枝反应体系中存在交联副反应,适当调节胶液浓度和引发剂用量可避免交联副反应的发生.
Maleated isoprene rubber(IR- g -MAH) was prepared with maleic anhydride(MAH)and isoprene rubber (IR) compounds catalyzed by the rare earth catalysts after polymerization reaction. The molecular structures of IR- g -MAH were characterized by Fourier transform infrared spectroscopy and its modification reaction mechanism was speculated. The grafting ratio of IR- g -MAH and grafting efficiency of the reaction were determined by chemical titration method. The results showed that aliphatic peroxide initiators p -menthane hydroperoxide had the higher grafting reaction activity than azodiisobutyronitrile and benzoyl peroxide in non-polar solvent hexane as the polymerization solvent for IR. The grafting reaction of MAH and IR followed the radical grafting reaction mechanism. Studies on the Grafting reaction conditions showed that there were crosslin- king side reactions in this high viscosity reaction system. Appropriate decreased in IR concentration and initiator concentration could effectively reduce the degree of crosslinking side reactions.
作者
何丽霞
刘光烨
刘福胜
HE Li-xia;LIU Guang-ye;LIU Fu-sheng(School of Chemical Engineering,Qingdao University of Science and Technology, Qingdao 266042, China;School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)
出处
《合成橡胶工业》
CAS
北大核心
2019年第4期260-265,共6页
China Synthetic Rubber Industry
关键词
马来酸酐
异戊橡胶
接枝率
接枝效率
反应机理
引发剂
maleic anhydride
isoprene rubber
grafting ratio
grafting efficiency
reaction mechanism
initiator
