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Hybrid Silica-Based Fillers in Nanocomposites: Influence of Isotropic/Isotropic and Isotropic/Anisotropic Fillers on Mechanical Properties of Styrene-Butadiene (SBR)-Based Rubber

机译:纳米复合材料中的杂种二氧化硅基填料:各向同性/各向同性和各向同性/各向异性填料对苯乙烯 - 丁二烯(SBR)的橡胶机械性能的影响

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摘要

The improvement of mechanical properties of polymer-based nanocomposites is usually obtained through a strong polymer–silica interaction. Most often, precipitated silica nanoparticles are used as filler. In this work, we study the synergetic effect occurring between dual silica-based fillers in a styrene-butadiene rubber (SBR)/polybutadiene (PBD) rubber matrix. Precipitated Highly Dispersed Silica (HDS) nanoparticles (10 nm) have been associated with spherical Stöber silica nanoparticles (250 nm) and anisotropic nano-Sepiolite. By imaging filler at nano scale through Scanning Transmission Electron Microscopy, we have shown that anisotropic fillers align only in presence of a critical amount of HDS. The dynamic mechanical analysis of rubber compounds confirms that this alignment leads to a stiffer nanocomposite when compared to Sepiolite alone. On the contrary, spherical 250 nm nanoparticles inhibit percolation network and reduce the nanocomposite stiffness.
机译:通过强聚合物 - 二氧化硅相互作用,通常通过强聚合物 - 二氧化硅相互作用获得基于聚合物基纳米复合材料的力学性能的改善。通常,沉淀的二氧化硅纳米粒子用作填料。在这项工作中,我们研究了苯乙烯 - 丁二烯橡胶(SBR)/聚丁二烯(PBD)橡胶基质中双二氧化硅基填料之间发生的协同作用。沉淀的高度分散的二氧化硅(HDS)纳米颗粒(10nm)与球形Stöber二氧化硅纳米颗粒(250nm)和各向异性纳米 - 海硫酸盐有关。通过扫描透射电子显微镜通过纳米刻度成像填料,我们已经表明,各向异性填料仅在存在临界量的HDS存在下对齐。橡胶化合物的动态力学分析证实,与单独的Sepiolite相比,该对准导致纤维型纳米复合材料。相反,球形250nm纳米粒子抑制渗透网络并降低纳米复合刚度。

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