撕裂模式下乙烯-丙烯酸共聚物/丁腈橡胶热塑性硫化胶的Mullins效应及其可逆回复  

Mullins effect under tearing mode and its reversibility of ethylene-acrylic acid copolymer/nitrile rubber thermoplastic vulcanizate

作　　者：孙颖涛 刘化通 王兆波[1] SUN Ying-tao;LIU Hua-tong;WANG Zhao-bo(College of Materials Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]青岛科技大学材料科学与工程学院,山东青岛266042

出　　处：《合成橡胶工业》2021年第1期28-32,共5页China Synthetic Rubber Industry

基　　金：山东省自然科学基金资助项目(ZR2017MEM021)。

摘　　要：采用动态硫化法制备了乙烯-丙烯酸共聚物(EAA)/丁腈橡胶(NBR)热塑性硫化胶(TPV),对其撕裂强度、微观相结构、撕裂模式下的Mullins效应及热处理条件下的Mullins效应可逆回复行为进行了研究。结果表明,EAA/NBR TPV在EAA与NBR的质量比为40/60时的撕裂强度和应变较高。微观形貌观察可见,EAA/NBR TPV呈现出典型的“海-岛”结构。在EAA/NBR TPV撕裂模式下的单轴循环加载-卸载过程中可观察到明显的Mullins效应,且随着应变的增大,最大撕裂强度、瞬时残余应变、内耗及阻尼因子均增大,但应力软化因子则减小。经适当热处理后EAA/NBR TPV的Mullins效应回复能力得到明显提高,且在105℃时回复效果最好。Thermoplastic vulcanizates(TPV)based on ethylene-acrylic acid copolymer(EAA)/nitrile rubber(NBR)blends were prepared by dynamic vulcanization process,the tearing strength,microstructure,Mullins effect under tearing mode and its reversible behavior at different heat temperatures were investigated.The results showed that the tearing strength and strain of EAA/NBR TPV were higher when the mass ratio of EAA to NBR was 40/60.Microscopic observation showed that EAA/NBR TPV had a typical structure of“sea-island”microstructure.An obvious Mullins effect could be observed during the uniaxial cycle loading-unloading of EAA/NBR TPV under tearing mode.The maximum tear strength under tearing mode,residual deformation,internal friction and damping factor were increased with the increasing of strain under tearing mode,while the degree of stress softening effect was decreased.During the reversible recovery process of Mullins effect,the recovery ability of EAA/NBR TPV was significantly improved after the proper heat treatment,and the recovery effect was best at 105℃.

关 键 词：乙烯-丙烯酸共聚物 丁腈橡胶 动态硫化 Mullins效应 撕裂模式 可逆回复 

分 类 号：TQ334.9[化学工程—橡胶工业]