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	合成橡胶工业 CHINA SYNTHETIC RUBBER INDUSTRY 2009 Vol.32 No.6 P.507-511

几种胎面用橡胶及其混炼胶的应力弛豫特性

王焰　赵素合　梁磊　

摘　要：研究了4种胎面用胶[星形全偶联溶聚丁苯橡胶(S-SSBR)、偶联度为40%的SSBR 2305、乳聚丁苯橡胶(ESBR),顺丁橡胶(BR)]生胶及其混炼胶的应力弛豫特性,分析了弛豫机理,考察了混炼胶的应力弛豫和挤出膨胀性能间的关系.结果表明,4种生胶及其混炼胶的应力弛豫过程均表现出快速和缓慢弛豫2个阶段;生胶的应力弛豫机理:ESBR和BR为缠结分子链束和自由分子链解取向过程,2种SSBR为锡偶联分子链束和分子链的解取向过程;4种混炼胶的弛豫机理为橡胶-炭黑变形网络的回缩和分子链受阻解取向过程;2种SSBR生胶及混炼胶的快速弛豫阶段更显著;在实验温度范围,随着温度升高,2种SSBR的弛豫时间明显缩短,ESBR略有缩短,BR变化不大.2种SSBR生胶与混炼胶的应力弛豫时间比值远大于ESBR和BR;2种SSBR混炼胶的应力弛豫时间短,挤出膨胀比小.
关键词：胎面胶;偶联溶聚丁苯橡胶;乳聚丁苯橡胶;顺丁橡胶;生胶;混炼胶;应力弛豫;挤出膨胀
分类号：TQ333 　文献标识码：B
文章编号：1000-1255(2009)06-0507-05

Stress relaxation characteristics of several kinds of rubber and their compounds used in tire tread

Wang Yan（Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, China）　 Zhao Suhe（Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, China）　 Liang Lei（Key Laboratory for Nanomaterials of Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China）　

Abstract：The stress relaxation characteristics of four kinds of raw rubber, such as star-shaped solution-polymerized styrene-butadiene rubber(S-SSBR), SSBR 2305 with coupling degree of 40%, emulsion styrene-butadiene rubber (ESBR) and cis-1,4-polybutadiene rubber(BR), and their compounds were studied,and the stress relaxation mechanism was analyzed. The relationship between stress relaxation and extrusion swelling of the compounds was investigated. The results showed that the stress relaxation of all the four kinds of raw rubber and their compounds used in tire tread exhibited two stages, fast and slow relaxation. The stress relaxation mechanism of raw rubbers was found to be that the relaxation of ESBR and BR was deorientation of tangled molecular chains and free molecular chains, while the relaxation of S-SSBR and SSBR 2305 was the deorientation of coupled molecular chains and tangled free molecular chains. The stress relaxation mechanism of rubber compounds was the retraction of rubber-carbon deformation network and deorientation of hindered molecular chains. The fast relaxation of the two kinds of SSBR raw rubber and rubber compounds was more obvious. In the experiment temperature range, with the temperature, the relaxation time of the two kinds of SSBR significantly shortened, ESBR slightly shortened and BR had little change. The stress relaxation time ratios of the raw rubbers to their rubber compounds of S-SSBR and SSBR 2305 respectively were much larger than those of ESBR and BR. Due to their shorter relaxation time, the compounds of S-SSBR and SSBR 2305 has smaller extrusion swelling ratio.
Keywords：tire tread; coupled solution-polymerized styrene-butadiene rubber; emulsion styrene-butadiene rubber; cis-1,4-polybutadiene rubber; raw rubber; compound; stress relaxation; extrusion swelling

基金项目：国家"十五"攻关计划资助项目(2004 BA 310 A 41).
作者简介：王焰(1984-),男,硕士研究生.已发表论文1篇.
作者单位：王焰（北京化工大学,北京市新型高分子材料制备与成型加工重点实验室,北京,100029）　
　　　　　赵素合（北京化工大学,北京市新型高分子材料制备与成型加工重点实验室,北京,100029）　
　　　　　梁磊（北京化工大学,纳米材料先进制备技术与应用科学教育部重点实验室,北京,100029）　

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收稿日期：2008年11月24日

修稿日期：2009年8月26日

出版日期：2009年11月15日