Increasing chemisorbed silane coupling agents in surface-treated layer of silica particles
Increasing chemisorbed silane coupling agents in surface-treated layer of silica particles
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DOI：
10.1002/app.51297
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发表时间：
2021-06-21
影响因子：
3
通讯作者：
Nakamura, Yoshinobu
中科院分区：
文献类型：
--
作者：
Nakamura, Takashi;Tsutsumi, Ryota;Nakamura, Yoshinobu
在硅烷偶联剂(SCA)表面处理的无机粒子中，处理层中存在化学吸附和物理吸附的分子。研究了通过增加SCA的相对分子质量来增加化学吸附量。经3-甲基丙烯氧基丙基三甲氧基硅烷处理的二氧化硅颗粒在室温下储存10天以上，通过自缩合形成低聚物。单体SCA通过加热很容易蒸发。低聚物限制了蒸发，加热增加了化学吸附。考察了SCA相对分子质量的影响。在氨基的情况下，高分子量的氨基乙基辛基三甲氧基硅烷的化学吸附量大于3-氨丙基三乙氧基硅烷。对于具有碳氢链的SCA，无论是低分子量的SCA还是高分子量的十烷基三甲氧基硅烷(D)的化学吸附量都较低。对于氟碳链，低分子1H，1H，2H，2H-heptadecafluorodecyltriethoxysilane(F)的化学吸附量较小，而高相对分子质量的F型分子的化学吸附量随加热而显著增加。经氟处理的二氧化硅颗粒的广角X射线衍射分析表明，氟碳碳链形成了有序结构。对于D处理系统，没有这样的指征。这种有序结构似乎影响了氟处理体系的高化学吸附。
In the surface treated inorganic particles with silane coupling agent (SCA), chemisorbed and physisorbed molecules are present in the treated layer. Increasing the amount of chemisorption by increasing the molecular weight of SCAs was investigated. Oligomers formed via self-condensation during storage more than 10 days at room temperature for 3-methacryloxypropyltrimethoxysilane-treated silica particles. Monomeric SCA evaporates easily by heating. The oligomers restrict evaporation, and heating increases the chemisorption. The influence of molecular weight of SCA was investigated. In the case of amino group, the amount of chemisorbed was greater for aminoethylaminooctyltrimethoxysilane with high molecular weight than for 3-aminopropyltriethoxysilane. For SCAs with hydrocarbon chains, the amount of chemisorption was lower for both low molecular weight molecules and decyltrimethoxysilane (D) with a high molecular weight. For fluorocarbon chains, the amount of chemisorption was lower for low molecular weight molecules, whereas it increased significantly by heating for high molecular weight type of 1H,1H,2H,2H-heptadecafluorodecyltriethoxysilane (F). Wide-angle X-ray diffraction analysis of F-treated silica particles showed that the fluorocarbon chains formed an ordered structure. There was no such indication for the D-treated system. This ordered structure seems to influence on higher chemisorption for F-treated systems.