Antioxidation efficiency and reinforcement performance of precipitated-silica-based immobile antioxidants obtained by a sol method in natural rubber composites
Antioxidation efficiency and reinforcement performance of precipitated-silica-based immobile antioxidants obtained by a sol method in natural rubber composites
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溶胶法沉淀二氧化硅基固定抗氧剂在天然橡胶复合材料中的抗氧化效率和补强性能
DOI：
10.1039/c5ra15435a
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发表时间：
2015-10
期刊：
影响因子：
--
通讯作者：
Guangsu Huang
中科院分区：
文献类型：
--
作者：
Haitao Wei;Junjun Zhou;Jing Zheng;Guangsu Huang
将四乙氧基硅烷-40（TEOS）在碱性环境下水解，制备出由大量硅酸低聚物组成的溶胶前体，然后通过硅烷偶联剂3-缩水甘油氧基丙基三甲氧基硅烷（KH-560）将硅酸低聚物接枝到抗氧化剂-4010NA（AO）的中间体4-氨基二苯胺（RT）上，生成沉淀二氧化硅基抗氧化剂(P-RT)通过缩聚反应。傅里叶变换红外光谱（FTIR）测试表明RT已成功接枝到沉淀二氧化硅的表面。热重分析（TGA）结果表明该溶胶接枝方法具有较高的接枝效率。大量接枝的抗氧化基团起到与传统表面改性剂双(3-三乙氧基甲硅烷基丙基)四硫化物(TESPT)相同的作用。拉伸试验结果表明，在天然橡胶基体中，P-RT的补强性能优于TESPT改性白炭黑。氧化诱导时间（OIT）测试和加速老化测试表明，P-RT比相应的低分子对应物（4010NA）具有更好的抗氧化和抗迁移效率。
Tetraethoxysilane-40 (TEOS) was hydrolyzed in an alkaline environment to prepare a sol precursor consisting of large amounts of silicic acid oligomers, and then the silicic acid oligomer was grafted with 4-aminodiphenylamine (RT) which was the intermediate of antioxidant-4010NA (AO) via silane coupling agent 3-glycidoxypropyltrimethoxysilane (KH-560), generating the precipitated-silica-based antioxidant (P-RT) through the condensation polymerization. A Fourier transform infrared spectroscopy (FTIR) test demonstrated that RT has been successfully grafted onto the surface of precipitated silica. Thermogravimetric analysis (TGA) results exhibited the high grafting efficiency of this sol-grafting method. The massive grafted antioxidant groups took the same role as the traditional surface modifier bis(3-triethoxysilylpropyl)tetrasulfide (TESPT). According to the results of tensile tests, the reinforcement performance of P-RT was better than that of the silica modified by TESPT in a natural rubber matrix. Oxidation induction time (OIT) tests and accelerated aging tests revealed that P-RT possessed much better anti-oxidative and anti-migratory efficiency than that of the corresponding low molecular counterpart (4010NA).
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