通过调控氯化聚乙烯橡胶相交联密度计算氯化聚乙烯橡胶/丁腈橡胶共混胶应力-应变关系  

Calculation of stress-strain relationship of chlorinated polyethylene rubber/nitrile rubber blend by regulating cross-linking density of chlorinated polyethylene rubber phase

作　　者：孙臻豪 邓涛[1] SUN Zhen-hao;DENG Tao(School of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]青岛科技大学高分子科学与工程学院,山东青岛266042

出　　处：《合成橡胶工业》2023年第6期457-464,共8页China Synthetic Rubber Industry

摘　　要：以氯化聚乙烯橡胶(CM)和丁腈橡胶(NBR)为主要原料,采用机械共混法制备了CM/NBR共混硫化胶,通过改变CM/NBR共混硫化胶中CM相硫化体系的用量并采用平衡溶胀法、力学性能测试、理论计算等手段表征了CM/NBR共混硫化胶中CM相的交联密度及CM/NBR共混硫化胶的应力-应变关系,研究了CM相交联密度变化对CM/NBR共混硫化胶中两相定伸应力匹配程度和力学性能的影响。结果表明,由CM相交联密度增加所引起CM/NBR共混硫化胶定伸应力的变化大于CM相本身的定伸应力变化;随着定伸应力的增加,CM相交联密度变化对CM/NBR共混硫化胶定伸应力的影响增大;通过CM/NBR共混硫化胶中CM相和NBR相应力-应变关系的对比和CM/NBR共混硫化胶力学性能的变化验证了CM相交联密度的降低是两相定伸应力逐渐匹配的过程;与测试的应力-应变关系相比,采用拟合模型预测的共混硫化胶应力-应变关系的误差相对较小,表明此法具有一定的适用性。Chlorinated polyethylene rubber(CM)/nitrile rubber(NBR)blend vulcanizates were prepared by mechanical blending method with CM and NBR as main raw materials,the cross-linking density of CM phase in CM/NBR blend vulcanizate and the stress-strain relationship of CM/NBR blend vulcaizate were characterized by regulating the dose of vulcanization system of CM phase in CM/NBR blend combined with the means of equilibrium swelling method,testing mechanical properties and theoretical calculation,and the influence of the change of cross-linking density of CM phase on matching degree of the modulus of two phase in CM/NBR blend vulcanizate and mechanical properties of CM/NBR blend vulcanizate were studied.The results showed that the change of the modulus of CM/NBR blend vulcanizate caused by the increase in cross-linking density of CM phase was greater than that of its own;with the increase of modulus,the influence of the change of cross-linking density of CM phase on the modulus of CM/NBR blend vulcanizate increased;by comparing the stress-strain relationship of CM phase and NBR phase in CM/NBR blend vulcanizate and the change of mechanical properties of CM/NBR blend vulcanizate,it was proved that the decrease of the cross-linking density of CM phase was a process of the gradual matching of the modulus of the two phase;compared with the error of the measured stress-strain relation,that of the stress-strain relationship predicted by fitting model was relatively smaller,which indicated that fitting model had certain applicability.

关 键 词：氯化聚乙烯橡胶 丁腈橡胶 机械共混法 硫化胶 平衡溶胀法 交联密度 拟合模型 力学性能 

分 类 号：TQ333.7[化学工程—橡胶工业]