OV-POSS改性CM胶料的硫化行为及其硫化胶的性能

将氯化聚乙烯弹性体(CM)与笼型八乙烯基倍半硅氧烷(OV-POSS)进行共混,制备POSS改性CM胶料；采用过氧化二异丙苯(DCP)为硫化剂,三烯丙基异氰脲酸酯(TAIC)为助硫化剂,利用无转子硫化仪对该改性胶料的硫化行为及硫化动力学进行研究。利用动态力学热分析仪(DMA)以及热机械分析仪(TMA)对硫化胶的力学性能、热稳定性能,及其动、静态热机械性能进行了研究。结果表明：随着OV-POSS用量的增加,改性胶料的硫化反应活化能逐步降低,硫化速度加快,硫化胶的拉伸强度、玻璃化温度(T_g)相应提高。表明OV-POSS对CM的硫化具有促进作用,加入OV-POSS,可改善其硫化胶的力学性能以及提高热稳定性能。

Vulcanization behavior of CM modified by OV-POSS and performance of their vulcanizates

In the present study, chlorinated polyethylene elastomer (CM) was mixed with polyhedral oligomeric silsesquioxane(OV-POSS), and a series of CM modified by OV-POSS were prepared. After that, they were cured with dicumyl peroxide (DCP) and triallylisocyanurate (TAIC) as curing system, and their vulcanization behavior and curing kinetics were investigated via a moving-die rheometer. Moreover, the mechanical properties, thermal stability, dynamic and static thermo-mechanical properties of vulcanizates were studied by dynamic mechanical analysis (DMA) and thermomechanical analyzer (TMA). The results indicated that, with increasing amount of OV-POSS, the activation energy of the vulcanization reaction of the modified rubber gradually decreases and curing rates increased gradually, the tensile strength and glass transition temperature (T_g) of the vulcanizates increased correspondingly, implying that OV-POSS can helpful to accelerate the vulcanization of CM elastomer, and to modify its the mechanic performance and heat resistance.