橡胶-填料相互作用对丁苯橡胶/白炭黑复合材料性能的影响  

Effect of rubber-filler interactions on the properties of silica filled styrene-butadiene rubber

作　　者：曲亮靓[1] 解希铭[1] 于国柱[1] 姜科[1] 

机构地区：[1]中国石油化工股份有限公司北京化工研究院燕山分院,北京102500

出　　处：《中国科学：化学》2014年第11期1723-1732,共10页SCIENTIA SINICA Chimica

摘　　要：本文研究了硅烷偶联剂原位改性白炭黑对溶聚丁苯橡胶(SSBR)性能的影响,结果表明,通过哈克转矩流变仪对含有偶联剂的SSBR/白炭黑混炼胶进行原位热处理后可明显减弱混炼胶的Payne效应,改善白炭黑在橡胶基体中的分散.原位热处理方法能够明显提高硫化胶的300%定伸应力,降低动态压缩温升,同时可使硫化胶在0℃附近具有较高的损耗因子(tanδ),60℃附近具有较低的tanδ.对不同聚合方式得到的丁苯橡胶,即溶聚丁苯橡胶与乳聚丁苯橡胶(ESBR)/白炭黑复合材料的力学性能及动态力学性能进行了研究,结果表明,白炭黑在SSBR2305中分散效果优于在ESBR1502中;采用偶联剂原位改性白炭黑可以使SSBR2305硫化胶获得与ESBR1502硫化胶相当的物理机械性能,更理想的动态力学性能,从而得到力学性能、抗湿滑性、滚动阻力及耐磨性更加均衡的理想轮胎材料.通过对具有不同偶联效率的SSBR/白炭黑体系的微观结构与性能研究发现,随偶联效率的增加,其结合橡胶含量增加,Payne效应减弱;高偶联效率的S-SBR具有较低的动态压缩温升及较好的耐磨性.In this work, the effect of rubber-filler interactions on dynamic properties of solution-polymerized styrene-butadiene rubber（SSBR） filled by in-situ modified silica was studied. It was observed that the in-situ modification of silica was an effective way to enhance the SSBR-silica interactions. A better dispersion of silica in rubber matrix was contributed to the increase of tanδ at 0 °C and the decrease of tanδ at 60 °C, suggesting the improvement of the performance in rolling resistance and wet grip behavior. As far as the polymerization method was concerned, emulsion-polymerized SBR（ESBR） was chosen for comparison with SSBR. In the silica filled rubber system, ESBR exhibited relatively high hysteresis compared to SSBR. This was attributed to better dispersion of silica in SSBR proved by lower magnitude Payne effect and more bound rubber content, which was probably caused by its macrostructure, i.e. controlled molecular weight and nearly monodispersed molecular weight distribution. The third factor considered in this paper was the coupling ratio of SSBR. With the increasing of coupling ratio, the magnitude of Payne effect was lowered and thus less hysteresis was observed. The higher molecular weight derived from higher coupling ratio was considered as the key factor for the better dispersion of silica. The high coupling ratio can improve rubbers＇ performance without sacrificing their processabilities.

关 键 词：溶聚丁苯橡胶 白炭黑 填料-橡胶相互作用 PAYNE效应 动态力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程] TQ333.1[化学工程—橡胶工业]