| With the development of the automotive industry and people's awareness of environmental protection, silica as a reinforcing filler used in the rubber industry is becoming more important. Silica-rubber composites offer a number of advantages, such as better rolling resistance and reduction of heat build-up. But silica shows poor compatibility with rubber. The sol-gel method is a method for preparing organic/inorganic hybrid materials, which can effectively solve the problem of the dispersion of the filler. In this paper, we fist synthesized siloxane-functionalized PB-silane using n-BuLi as initiator and CPTMO and triethoxychlorosilane as capping agents. Subsequently, PB/SiO2 hybrid materials were prepared by sol-gel reaction of PB-silane and TEOS. In addition, we discussed the effective of two kinds capping agents, sol-gel reaction conditions and the preparation method of SEM samples. On this basic, we used dilithium initiator and CPTMO capping agent to synthesis silane-PB-silane. PB rubber composites with silica reinforcement were prepared by sol-gel reaction, and the silica-rubber having a well-defined crosslinked network.Silica-rubber composites were characterized by gel permeation chromatography (GPC), infrared spectroscopy (IR), nuclear magnetic resonance Pope ('H-NMR), thermal gravimetric analysis (TG), differential scanning calorimetry (DSC) and scanning electron microscope (SEM) and other analytical methods. The results showed that:capped efficiency of PB-silane was 99% and 90% by triethoxy chlorosilane and CPTMO, and functionalized efficiency of silane-PB-silane was 85%; silane-PB-silane and TEOS produced a cross-linked structure only by acid-catalyzed sol-gel reaction; mor eover, in situ generated SiO2 reinforcing fillers having a uniform particle size distribution, and substantially dispersed in a crosslinked network with single-particle state; and there are covalent interactions between SiO2 and polymer, which can effectively enhance the force between rubber and fillers. |
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