LENRA/二氧化硅复合材料的结构与性能

Maha Mohamed, I. Abdullah, H. Dahlan, E. Y. Ariffin
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引用次数: 0

摘要

采用四乙氧基硅烷(TEOS)对改性天然橡胶(NR)基体进行溶胶-凝胶反应,得到原位合成的NR/二氧化硅复合材料。改性NR链中丙烯酸酯基团的存在使复合材料具有辐射固化性。基质中二氧化硅的最大生成量为50phr(重量计)。在溶胶-凝胶过程中,无机矿物沉积在橡胶基体中,形成有机相和无机相之间的氢键。用热重分析和红外光谱等方法对所制得的复合材料进行了表征,研究了其分子结构。低二氧化硅含量(<20phr)时,力学性能的提高取决于填充剂在橡胶基体中的均匀性。对于高含量的TEOS (bbb30phr),产生了更多的二氧化硅,以牺牲机械性能为代价观察到团聚。从DMTA数据来看,橡胶和二氧化硅相之间的相互作用增加到30phr TEOS。用透射电镜分析了非均相体系的结构和形貌。当TEOS含量小于20phr时,复合材料的平均粒径在150nm ~ 300nm之间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Structure and properties of LENRA/silica composite
The sol-gel reaction using tetraethoxysilane (TEOS) was conducted for modified natural rubber (NR) matrix to obtain in situ generated NR/silica composite. The present of acrylate group in the modified NR chain turns the composite into radiation-curable. The maximum amount of silica generated in the matrix was 50phr by weight. During the sol-gel process the inorganic mineral was deposited in the rubber matrix forming hydrogen bonding between organic and inorganic phases. The composites obtained were characterized by various techniques including thermogravimetric analysis and infrared spectrometry to study their molecular structure. The increase in mechanical properties was observed for low silica contents (<20phr) depending on the homogeneity of the filler in the rubber matrix. For higher contents of TEOS (>30phr) where more silica were generated, agglomerations were observed at the expense of the mechanical properties. From the DMTA data, it shows an increase of the interaction between the rubber and silica phases up to 30phr TEOS. Structure and morphology of the heterogeneous system were analyzed by transmission electron microscopy. The average particle sizes of between 150nm to 300nm were achieved for the composites that contain less than 20phr of TEOS.
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