乙烯-醋酸乙烯共聚物/丁苯橡胶热塑性硫化胶的压缩Mullins效应及其可逆回复  

Mullins Effect Under Compression Mode and Its Reversibility of EVA/SBR Thermoplastic Vulcanizates

作　　者：王灿灿[1] 刘情情[1] 王兆波[1] 

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：《青岛科技大学学报（自然科学版）》2016年第1期56-61,共6页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：山东省自然科学基金项目(ZR2012EMM002);山东省高等学校科技计划项目(J12LA15)

摘　　要：采用动态硫化法制备了乙烯-醋酸乙烯共聚物（EVA）/丁苯橡胶（SBR）热塑性硫化胶（TPV）,对其微观结构、压缩Mullins效应及其可逆回复进行了研究。结果表明：TPV在单轴循环压缩过程中存在显著的Mullins效应,在特定压缩应变下,最大压缩应力、内耗及tanδ均在第一次循环压缩时出现最大值,第二次压缩时显著降低,之后下降趋势减缓;提高热处理温度,二次循环压缩的最大压缩的应力回复程度增大,且80℃热处理时Mullins效应回复效果最佳。研究表明,SBR硫化胶粒子以3～8μm的尺寸均匀分散于刻蚀样品表面。Thermoplastic vulcanizates （TPV） based on ethylene-vinyl acetate copolymer （EVA）/styrene-butadiene rubber （SBR） blends were prepared by dynamic vulcanization. The microstructure, Mullins effect under compression mode and its reversibility of the prepared TPV were investigated. Experimental results indicated that Mullins effect could be observed in the compression stress-strain curves of the TPV during the uniaxial loading-unloading cycles; and the maximum stress, internal friction loss and tan3 at specific strain were decreased obviously after the first loading-unloading while only decreased slightly at the later loading-unloading cycles. The maximum compression stress reversibility of the compressed sample during the secondary compressing were improved with the increase of the heat treatment temperature, and the best performance was achieved when the temperature was 80 ℃. Morphology studies showed that the crosslinked SBR particles, with the dimensions of 3-8 μm, were dispersed evenly in the etched surface of the thermoplastic matrix.

关 键 词：乙烯-醋酸乙烯共聚物 丁苯橡胶 动态硫化 压缩Mullins效应 可逆回复 

分 类 号：TQ334.2[化学工程—橡胶工业] TQ333.1