Abstract The incorporation of nanofillers into polymeric matrix has been proven to be an effective route to reinforce their mechanical properties, and the usage of binary fillers that combines the advantages of the two fillers could lead to further property enhancement. In this work, binary nanofillers consist of multi-walled carbon nanotubes (MWCNTs)-bridged fumed silica (FSiO2) were synthesized for the first time by Pt coupling reaction of methyldiethoxysilane (MDES) modified MWCNTs and triethoxyvinylsilane (TEVS) functionized SiO2, in which MDES modified MWCNTs was synthesized by reacting OH-functionized MWCNTs with MDES, while TEVS-FSiO2 was obtained by reacting fume silica with TEVS. The binary MWCNTs-bridged-FSiO2 was introduced into liquid silicone rubber (LSR) for mechanical reinforcement. It is shown that the interfacial interaction between binary fillers and LSR matrix is significantly enhanced due to the chemical bridging as well as the excess TEVS molecules on SiO2, and the Young's modulus, tensile strength and tear strength of the LSR could be increased by 64%, 29% and 52%, respectively, with incorporation of only 0.25 phr of MWCNTs for the binary fillers. The observed mechanical enhancement could be attributed to good interfacial interaction between the fillers and LSR due to the existence of SiO2 (with excess matrix compatible molecules) on the surface of MWCNTs, which facilitate the filler dispersion in LSR matrix and the promote stress transfer from matrix to MWCNTs, as well as the advantages of extremely high aspect ratio and excellent mechanical strength of MWCNTs.

中文翻译：

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碳纳米管桥接气相二氧化硅作为一种有效的二元纳米填料，用于增强有机硅弹性体

摘要 将纳米填料掺入聚合物基体已被证明是增强其机械性能的有效途径，结合两种填料优点的二元填料的使用可以进一步提高性能。在这项工作中，首次通过甲基二乙氧基硅烷 (MDES) 改性的 MWCNTs 和三乙氧基乙烯基硅烷 (TEVS) 功能化的 SiO2 的 Pt 偶联反应合成了由多壁碳纳米管 (MWCNTs)-桥连气相二氧化硅 (FSiO2) 组成的二元纳米填料，其中MDES 改性的 MWCNTs 是通过 OH 功能化的 MWCNTs 与 MDES 反应合成的，而 TEVS-FSiO2 是通过气相二氧化硅与 TEVS 反应获得的。将二元 MWCNTs-bridged-FSiO2 引入液体硅橡胶 (LSR) 以进行机械增强。结果表明，由于化学桥连以及SiO2上过量的TEVS分子，二元填料与LS​​R基体之间的界面相互作用显着增强，LSR的杨氏模量、拉伸强度和撕裂强度可提高64%分别为 29% 和 52%，其中二元填料仅掺入了 0.25 份 MWCNT。观察到的机械增强可能归因于填料和 LSR 之间良好的界面相互作用，因为 MWCNTs 表面存在 SiO2（具有过量的基体相容分子），这促进了填料在 LSR 基体中的分散并促进了应力从基体转移MWCNTs，以及MWCNTs极高的纵横比和优异的机械强度等优点。