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.
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)
出处
《功能材料》
EI
CAS
CSCD
北大核心
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)。
