基于反式聚异戊二烯/乙烯醋酸乙烯酯共聚三重形状记忆复合材料的制备及性能  

Preparation and properties of triple shape memory composites based on transpolyisopren/poly(ethylene-co-vinyl acetate)

作　　者：辛华[1] 李阳帆 彭琪 陈悦 李新琦 XIN Hua;LI Yangfan;PENG Qi;CHEN Yue;LI Xinqi(College of Chemistry and Chemical Engineering,Shaanxi University of Science&Technology,Xi'an 710021,China)

机构地区：[1]陕西科技大学化学与化工学院,西安710021

出　　处：《复合材料学报》2023年第7期4039-4047,共9页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51603117)~~。

摘　　要：本文将反式聚异戊二烯(TPI)和乙烯醋酸乙烯酯共聚物(EVA)复合,设计过氧化二异丙苯交联反应连接两相,制备TPI-EVA三重形状记忆复合材料。采用无转子硫化特性曲线、万能试验机、XRD、DSC、动态力学分析(DMA)对TPI-EVA复合材料进行了表征。探究了EVA质量比对TPI-EVA复合材料的力学性能、相结构、结晶性能及三重形状记忆性能的影响。结果表明,随着EVA质量比增加,TPI的结晶温度(Tc)从14.7℃降低至8.2℃,EVA的Tc略有上升。SEM结果表明,随EVA质量比增加,复合材料的相界面由光滑变为粗糙;DMA测试结果表明,EVA比例的增加使样品的第一临时形状固定率从57.6%提升至88.5%。此外,TPI-EVA复合材料表现出优异的力学强度,其中拉伸强度高达30.3 MPa,断裂伸长率达490%。The TPI-EVA triple shape memory composites were prepared by compounding trans-polyisoprene and poly(ethylene-co-vinyl acetate)(TPI-EVA),and designed cross-linking reaction of dicumyl peroxide to connect the two phases.The TPI-EVA composites were characterized by rheometer,universal testing machine,XRD,DSC and dynamic thermomechanical analyzer(DMA).The effects of the mass ratio of EVA on the mechanical properties,phase structure,crystalline properties and triple shape memory properties of TPI-EVA composites were studied.The results show that with the increase of the mass ratio of EVA,the crystallization temperature(Tc)of TPI decreases from 14.7℃to 8.2℃,and the Tc of EVA increase slightly.SEM test showed that with the increases of EVA mass ratio,the phase interface of the composites changes from smooth to rough;DMA test shows that the increase of EVA mass ratio increases the first temporary shape memory fixation rate of the samples from 57.6%to 88.5%.Moreover,the TPI-EVA composites exhibit excellent mechanical properties,the tensile strength is as high as 30.3 MPa and the elongation at break reaches 490%.

关 键 词：三重形状记忆效应 反式聚异戊二烯 乙烯醋酸乙烯酯共聚物 结晶性能 力学性能 

分 类 号：O636.9[理学—高分子化学]