Preparation, structure, and properties of solution-polymerized styrene-butadiene rubber with functionalized end-groups and its silica-filled composites
Preparation, structure, and properties of solution-polymerized styrene-butadiene rubber with functionalized end-groups and its silica-filled composites
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端基功能化溶液聚合丁苯橡胶及其二氧化硅填充复合材料的制备、结构与性能
DOI：
10.1016/j.polymer.2014.02.067
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发表时间：
2014-04-10
期刊：
影响因子：
4.6
通讯作者：
Bai, Yu
中科院分区：
文献类型：
--
作者：
Liu, Xiao;Zhao, Suhe;Bai, Yu
以双锂为引发剂，采用阴离子聚合法合成了溶聚丁苯橡胶（SSBR）和大分子链两端烷氧基硅烷官能化的溶聚丁苯橡胶（A-SSBR）。通过表征，证实了端基官能化和缩合反应的发生，并计算了A-SSBR大分子链末端接枝烷氧基硅烷基团的分子结构参数和端基官能化效率。通过这种新型的结构改性，二氧化硅和橡胶基体之间存在化学键合，而不是传统的物理吸附。这种新技术不仅有利于固定自由链末端以减少大分子链的自由末端的数量，而且还将橡胶链化学键合在二氧化硅颗粒表面以显著增强填料-聚合物相互作用。此外，在SiO2颗粒周围形成一层末端官能化的大分子链覆盖层，有利于减少SiO2颗粒的团聚，提高SiO2颗粒的分散性。研究了共凝聚法和机械共混法制备的SiO2/SSBR和SiO2/A-SSBR复合材料的结构、形态和性能。结果表明，SiO2/A-SSBR复合材料的综合性能优于SiO2/SSBR复合材料，具有较高的抗湿滑性和较低的滚动阻力。因此，A-SSBR是绿色轮胎胎面胶的理想材料。(c)2014爱思唯尔有限公司版权所有。
With anionic polymerization, the solution-polymerized styrene-butadiene rubber (SSBR) and solutionpolymerized styrene-butadiene rubber with alkoxysilane-functionalization at two ends of macromolecular chains (A-SSBR) were synthesized by dilithium as initiator. The occurrences of end-group functionalization and condensation reaction were confirmed, but also the molecular structure parameters and end-functionalized efficiency of A-SSBR grafted alkoxysilane groups onto the ends of its macromolecular chains were calculated through the characterizations. By this novel structural modification, there were chemical bondings rather than conventional physical adsorption between silica and rubber matrix. This novel technology was beneficial to not only immobilizing the free chain ends to decrease the amount of macromolecular chains' free terminals, but also chemically bonding the rubber chains on the surfaces of silica particles to enhance the filler-polymer interaction significantly. Furthermore, the covering layer of end-functionalized macromolecular chains around the silica particles was conducive to reducing the silica agglomeration and improving the silica dispersion. The structures, morphologies, and properties of SiO2/SSBR and SiO2/A-SSBR composites prepared by co-coagulation and mechanical blending, were investigated. The results showed that SiO2/A-SSBR composites behaved better comprehensive performances including higher wet skid resistance and lower rolling resistance than SiO2/SSBR composites. Consequently, A-SSBR was an ideal material for the green tire treads. (c) 2014 Elsevier Ltd. All rights reserved.