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镍顺丁硫化胶氧化断裂行为的解析——(Ⅰ)过氧化物硫化胶体系的氧化断裂行为
Analysis of Oxidative Scission Behaviour oF Ni-catalyzed Polybutadiene Vulcanizates (Part Ⅰ)——Oxidative Scission Behaviour of Peroxide Vulcanizate
【摘要】 在热氧老化过程中,用过氧化物硫化的镍顺丁橡胶是主链分子发生断裂。在连续化学松弛时不能用单一的 Maxwell 松弛方程描述,它近似的符合下式σ(?)/σ(0)=A1e-k1t+A2e-k2t由连续与间歇化学松弛曲线的比较表明,该硫化胶是链断裂反应和交联反应同时发生的,且交联反应速度是逐渐增加的。
【Abstract】 Peroxide vulcanizate of Ni—catalyzed polybutadiene has C—C crossl-inks.During the oxidative degradation seission reaction occurs onlyalong the main chain at high temperature.According to the Maxwellian decay curve the chemical relaxationapproximately coincides with the following equationσ(t)/σ(0)=e-xt(1)Upon continuous stress relaxation,its modified equation is express-ed asσ(t)/σ(0)=A1e-k1t+A2e-x2t(2)Comparison of the continuous stress relaxation curve with the intermittent one indicates that in the thermo—oxidative process the mainchain scission and crosslinking reaction concur.And the rate of crossl-ink reaction is gradually speeded up in the initiation step.
【Key words】 oxidative scission; chemical relaxation; Ni—catalyzed polybutadiene vulcanizate;
- 【文献出处】 青岛化工学院学报 ,Journal of Qingdao University of Science and Technology(Natural Science Edition) , 编辑部邮箱 ,1989年01期
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