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首页> 外文期刊>Journal of Applied Polymer Science >Quantitative measurement of physisorbed silane on a silica particle surface treated with silane coupling agents by thermogravimetric analysis
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Quantitative measurement of physisorbed silane on a silica particle surface treated with silane coupling agents by thermogravimetric analysis

机译：热重分析法定量测量硅烷偶联剂处理的二氧化硅颗粒表面的物理吸附硅烷

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We investigated a new method for estimating the amount of silanes physisorbed on a silica particle surface treated with silane coupling agents from a weight loss curve measured by thermogravimetric (TG) analysis. The silica particles were treated with 3-glycidoxypropyl trimethoxysilane (GPTMS) or 3-mercaptopropyl trimethoxysilane (MrPTMS) with both dry and wet treatment methods. In the TG curve for silica particles treated with GPTMS, the weight decreased in three steps: 100-170 degrees C (first step), 170-250 degrees C (second step), and 250-400 degrees C (third step). The weight loss in the first step decreased with heating or acetone washing to remove the physisorbed molecules as the posttreatment. The three weight losses were found to be based on physisorbed monomeric silanes (first step), physisorbed polycondensed silanes (second step), and chemisorbed silanes (third step), respectively. The amount of physisorbed silanes on the silane-treated layer could be estimated from the TG curve without solvent washing to remove the physisorbed molecules. The amounts obtained were almost equal to those measured from a comparison of the weight losses for the treated particles before and after acetone washing. A similar tendency was observed for MrPTMS-treated silica. Thus, the amount of physisorbed silanes in silane-coupling-agent-treated silica particles was successfully estimated from the TG measurements. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43256.
机译：我们研究了一种新方法，该方法可从通过热重（TG）分析测得的失重曲线估算出用硅烷偶联剂处理的二氧化硅颗粒表面上物理吸附的硅烷量。用3-环氧丙氧基丙基三甲氧基硅烷（GPTMS）或3-巯基丙基三甲氧基硅烷（MrPTMS）通过干法和湿法处理二氧化硅颗粒。在用GPTMS处理的二氧化硅颗粒的TG曲线中，重量减少了三个步骤：100-170摄氏度（第一步），170-250摄氏度（第二步）和250-400摄氏度（第三步）。第一步的重量损失随着加热或丙酮洗涤以除去物理吸附的分子而减少，作为后处理。发现这三种失重分别基于物理吸附的单体硅烷（第一步），物理吸附的缩聚硅烷（第二步）和化学吸附的硅烷（第三步）。可以从TG曲线估计硅烷处理的层上的物理吸附的硅烷的量，而无需进行溶剂洗涤以除去物理吸附的分子。得到的量几乎等于比较丙酮洗涤前后丙酮处理后重量损失的结果。对于MrPTMS处理的二氧化硅，观察到了类似的趋势。因此，通过TG测量成功地估计了硅烷偶联剂处理的二氧化硅颗粒中的物理吸附的硅烷的量。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，43256。

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