纳米二氧化硅对微交联三元乙丙橡胶的交联行为和物理发泡行为的影响研究  

Influences of nanosilica on vulcanization behavior and physical foaming behavior of micro-crosslinked EPDM

作　　者：郑皓 翟文涛 包锦标 郑文革 ZHENG Hao;ZHAI Wentao;BAO Jingbiao;ZHENG Wenge(School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China;Key Laboratory of Bio-based Polymer Materials Technology and Application of Zhejiang Province,Polymers and Composites Division, Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences, Ningbo 315201, China;School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China)

机构地区：[1]宁波大学材料科学与化学工程学院,浙江宁波315211 [2]中国科学院宁波材料技术与工程研究所,浙江省生物基高分子材料技术与应用重点实验室,浙江宁波315201 [3]中山大学材料科学与工程学院,广州510275

出　　处：《功能材料》2020年第6期6084-6090,6132,共8页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51873226)。

摘　　要：通过高压CO2流体物理发泡方法制备了微交联的三元乙丙橡胶(EPDM)纳米复合泡沫材料。研究了EPDM/SiO2纳米复合材料的交联动力学,纳米复合发泡材料的发泡倍率、泡孔形貌及拉伸性能,探讨了纳米粒子对EPDM交联行为和物理发泡行为的影响。研究结果表明,纳米SiO2的添加加快了EPDM的交联速率,但降低其交联程度;同时,纳米SiO2添加量的增加提高了EPDM发泡材料的膨胀倍率至10.3倍,加强了泡孔成核,使泡孔密度从105个/cm3增加至108个/cm3,提高了发泡材料的拉伸性能,其中拉伸强度从0.75MPa提升至1.65 MPa,断裂伸长率从225%提升至423%。不过,当添加量为5phr时,纳米SiO2对EPDM的发泡行为及其发泡材料的拉伸性能产生负面影响。所制备的EPDM/SiO2复合发泡材料具有微交联结构,模压后的薄膜可再次进行物理发泡。In this study,micro-crosslinked EPDM nanocomposite foams were prepared via a solid state foaming process with using compressed CO2 as blowing agent.Nano-silica was added as a nucleating agent and BIPB was selected as a crosslink agent.The influences of nanoparticle addition on the vulcanization kinetics and foaming behavior of EPDM were studied.It is observed that nano-silica could accelerate the cross-linking rate but reduced the crosslink degree of EPDM.Moreover,presence of nano-silica improved the foamability of EPDM,characterized by the increased foam expansion up to 10.3 times and increased cell density from 105 to 108 cells/cm3.Meanwhile,presence of nano-silica improved the tensile properties of the as-prepared EPDM foams,characterized by the increased tensile strength from 0.75 MPa to 1.65 MPa and increased elongation at break from 225%to 423%.At higher loading of 5 phr,however,nano-silica presented negative effect on the foaming of EPDM and the tensile properties of the prepared EPDM foam.It was interesting to find that the vulcanized EPDM/SiO2 nanocomposites possessed the micro-crosslinked structure,and which ensured that the fabricated EPDM/SiO2 foams could be melt-recycled and could be foamed again by blown with CO2.

关 键 词：纳米二氧化硅 三元乙丙橡胶 微交联 物理发泡 

分 类 号：TQ334[化学工程—橡胶工业]