Reactions of a trifunctional silane coupling agent in the presence of colloidal silica sets in polar media
Reactions of a trifunctional silane coupling agent in the presence of colloidal silica sets in polar media
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DOI：
10.1006/jcis.1999.6497
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发表时间：
1999-11-15
影响因子：
9.9
通讯作者：
McCormick, AV
中科院分区：
文献类型：
--
作者：
Daniels, MW;Sefcik, J;McCormick, AV
研究了3-环氧丙氧丙基三甲氧基硅烷（GPS）在富水环境中与硅溶胶的反应。使用Si-29 NMR光谱定量监测GPS水解、缩合和吸附随pH和水浓度的变化。结果表明，在二氧化硅表面上的吸附和在本体液体中的GPS的缩聚反应之间的竞争，并用于确定有利于表面改性的条件。胶体二氧化硅的存在下，显示出增加的表观GPS二聚化速率，这表明无论是表面催化或增加的局部反应物浓度的双电层周围的二氧化硅胶体。(C)北京：科学出版社.
Reactions of 3-glycidoxypropyltrimethoxysilane (GPS) in a water-rich environment with silica colloids were studied. Si-29 NMR spectroscopy was used to monitor quantitatively the variation in GPS hydrolysis, condensation, and adsorption with pH and water concentration. The results show the competition between adsorption on the silica surface and condensation polymerization of GPS in the bulk liquid and are used to identify conditions favorable to surface modification. The presence of colloidal silica was shown to increase the apparent GPS dimerization rate, suggesting either surface catalysis or an increased local reactant concentration in the electrical double layer around the silica colloids. (C) 1999 Academic Press.