液体橡胶对丁基橡胶复合材料力学性能和气密性能的影响  

Effect of liquid rubber on mechanical properties and gas barrier properties of butyl rubber composites

作　　者：杨长浩 温世鹏[1] YANG Zhanghao;WEN Shipeng(Beijing Engineering Research Center of Advanced Elastomers,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学北京市先进弹性体工程技术研究中心,北京100029

出　　处：《弹性体》2024年第2期1-6,共6页China Elastomerics

基　　金：国家自然科学基金项目(52273049)。

摘　　要：研究了不同类型液体橡胶(LR),包括两种液体三元乙丙橡胶(LEPDM),相对分子质量(M_(r))为30000或50000,两种液体聚异丁烯(LPIB),M_(r)为680或2400以及液体丁腈橡胶(LNBR),M_(r)为5000对丁基橡胶(IIR)/LR复合材料力学性能、自由体积和气密性能的影响规律。结果表明,LR使复合材料交联密度降低,断裂伸长率和拉伸强度显著提高,IIR/LNBR 5000较IIR在拉伸及撕裂强度上分别提高了74.7%和29.4%。正电子湮灭测试表明,除LPIB 2400外,其他几种LR均会造成复合材料自由体积分数的升高。气密性能结果表明,分子链运动能力是决定IIR/LR复合材料氮气渗透系数的关键因素,IIR/LPIB 2400和IIR/LNBR 5000两组的氮气渗透系数较IIR分别降低了13.0%和14.3%。Different types of liquid rubber including liquid EPDM(LEPDM,M r=30000/50000),liquid polyisobutene rubber(LPIB,M_(r)=680/2400)and liquid nitrile butadiene rubber(LNBR,M_(r)=5000)on mechanical properties,free volume and gas barrier properties of butyl rubber/liquid rubber composites were studied.The results showed that the crosslinking density of the composite decreased while the elongation at break and tensile strength strength increased significantly after the addition of liquid rubber.Compared with IIR,the tensile strength and tear strength of IIR/LNBR 5000 increased by 74.7%and 29.4%,respectively.Positron annihilation test showed that liquid rubber increased the free volume of the composite except LPIB 2400.The gas permeability tests confirmed that the molecular chain movement was the key factor to determine the nitrogen permeability coefficient of IIR/LR composites.The nitrogen permeability coefficients of IIR/LPIB 2400 and IIR/LNBR 5000 decreased by 13.0% and 14.3%,respectively,compared with that of IIR.

关 键 词：液体橡胶 丁基橡胶 力学性能 自由体积 气密性能 

分 类 号：TQ333.4[化学工程—橡胶工业]