Performance enhancement of rubber composites using VOC-Free interfacial silica coupling agent
Performance enhancement of rubber composites using VOC-Free interfacial silica coupling agent
复制标题
使用无VOC界面二氧化硅偶联剂增强橡胶复合材料的性能
DOI：
10.1016/j.compositesb.2020.108301
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发表时间：
2020-12-01
影响因子：
13.1
通讯作者：
Zhang, Liqun
中科院分区：
文献类型：
--
作者：
Ye, Neng;Zheng, Junchi;Zhang, Liqun
纳米二氧化硅是制造“绿色轮胎”用弹性体复合材料的重要组分。然而，二氧化硅颗粒在橡胶基体中的分散性差，以及二氧化硅改性过程中挥发性有机化合物（VOCs）的排放限制了改性剂的应用。本文设计合成了一种新型的环氧型偶联剂--双环氧丙基聚硫醚（BEP），用于纳米SiO2的改性，使纳米SiO2与橡胶基体之间产生界面作用，避免VOC的释放。热重分析结果和结合橡胶含量表明，BEP有效地在纳米SiO2和橡胶之间架起了一座桥梁，从而产生了较强的界面效应和良好的力学性能。用透射电镜和橡胶加工分析仪研究了白炭黑在溶聚丁苯橡胶（SSBR）中的分散情况，结果表明，BEP能显著改善白炭黑在SSBR中的分散。静态和动态力学性能测试结果表明，BEP是一种有效的偶联剂，可以获得高模量和增强指数的白炭黑/SSBR复合材料。此外，BEP与双-（γ-三乙氧基硅丙基）-四硫化物（TESPT）的组合也显示出协同效应，这导致白炭黑/SSBR复合材料具有优异的静态和动态性能，用于制备更高能效的“绿色轮胎”。"
Nano-silica is an important component for producing elastomer composites used for fabricating "green tires." However, the poor dispersion of silica particles in the rubber matrix and the emission of volatile organic compounds (VOCs) during the silica modification limit the applications of the modifiers. Here, bis-epoxypropyl polysulfide (BEP), a novel epoxy-type coupling agent, was designed and synthesized for nano-silica modification to cause an interfacial interaction between nano-silica and the rubber matrix and avoid VOC emission. The thermogravimetric analysis result and the bound rubber content show that BEP effectively built a bridge between the nano-silica and the rubber, which led to a strong interfacial effect and promising mechanical performance characteristics. The silica dispersion in solution-polymerized styrene-butadiene rubber (SSBR) was studied using a transmission electron microscope and a rubber process analyzer, and the results demonstrate that BEP could significantly improve silica dispersion. The static and dynamic mechanical performance results indicate that BEP is a valid coupling agent that can achieve silica/SSBR composites with high moduli and reinforcement indices. Moreover, the combination of BEP and bis-(gamma-triethoxysilylpropyl)-tetrasulfide (TESPT) was also found to demonstrate a synergistic effect, which resulted in excellent static and dynamic performances of silica/SSBR composites for preparing higher-energy-efficient "green tires."