乙烯基三甲氧基硅烷用量对烯烃复分解反应改性溶聚丁苯橡胶的影响  

Influence of vinyltrimethoxysilane amount on modification of solution-polymerized styrene-butadiene rubber by olefin metathesis

作　　者：刘姣 朋泽蕙 赵菲[1] LIU Jiao;PENG Zehui;ZHAO Fei(School of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]青岛科技大学高分子科学与工程学院,山东青岛266042

出　　处：《弹性体》2020年第6期30-33,共4页China Elastomerics

基　　金：国家重点基础研究计划(973计划)项目(2015CB654706)。

摘　　要：以含双键的乙烯基三甲氧基硅烷(VTMO)为小分子烯烃,采用烯烃复分解反应对溶聚丁苯橡胶(SSBR)进行改性。研究了VTMO的用量对改性后SSBR的相对分子质量、与白炭黑的相互作用及硫化胶物理机械性能的影响。研究表明,VTMO改性后的SSBR相对分子质量普遍降低,硫化最低转矩降低,最高转矩升高,交联密度提高,硫化速度加快,加工性能得到改善。由于硅氧烷基团的引入,改性后的SSBR与白炭黑之间的相互作用加强,结合胶含量增加,混炼胶的Payne效应降低,白炭黑分散变好。与未改性SSBR相比,当VTMO与SSBR中双键摩尔比为0.1%时,虽然改性SSBR的相对分子质量降低了21%,但硫化胶的拉伸强度和拉断伸长率分别提高32%和25%;60℃的tan δ降低了约16%,用于绿色轮胎将有更低的滚动阻力。Vinyltrimethoxysilane(VTMO)containing dowble bond was chosen as small olefin and reacted with solution-polymerized styrene-butadiene rubber(SSBR)through metathesis.The influence of VTMO amount on molecular weight,interaction with silica and mechanical properties of modified SSBR was investigated.The results showed lower molecular weight of modified SSBR,lower minimum torque,higher maximum torque,higher crosslink density and higher cure rate indicated better processability.The interaction between silica and modified SSBR was improved due to the introduction of siloxane group onto SSBR,consequently higher bound rubber content,lower Payne effect and better silica dispersion.Compared with unmodified SSBR,when the mole ratio of double bond in VTMO with SSBR was 0.1%,the molecular weight of modified SSBR decreased by 21%,but its tensile strength and elongation at break increased by 32%and 25%,respectively,and dynamic loss factor(tanδ)at 60℃decreased by 16%,indicating lower rolling resistance for green tire.

关 键 词：烯烃复分解 溶聚丁苯橡胶 白炭黑 结合橡胶 PAYNE效应 

分 类 号：TQ433.9[化学工程]