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首页> 外文期刊>Journal of porous materials >Studies on functionalized mesoporous materials-Part Ⅰ: characterization of silylized mesoporous material of type MCM-41
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Studies on functionalized mesoporous materials-Part Ⅰ: characterization of silylized mesoporous material of type MCM-41

机译：功能化介孔材料的研究-第一部分：MCM-41型甲硅烷基化介孔材料的表征

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The synthesis of organic-inorganic composite materials was performed by the surface modification of mesoporous material type MCM-41 by chlor-odimethylphenylsilane and dichloromethylphenylsilane. Applying IR spectroscopy, low temperature nitrogen adsorption/desorption (isotherms BET), thermogravimetric measurements and technique of competitive adsorption of toluene and water it was shown that the degree of silyla-tion, hydrophobicity, surface and volume properties (pore size distribution, pore volume) strongly depends on the nature of silylation agent and the ratio of calculated amount of silanol groups to the modifier. Two types of condensation reaction take place: (1) the reaction of the modifier with surface silanol groups, and (2) an inter-molecular condensation of the modifier, resulting in additional pore blocking. Only 24-36 % of the surface silanol groups react with modifier agent. The materials are stable up to temperatures of about 170 ℃ that is higher than the corresponding polymeric resins. The TG/DTA data allowed concluding that the degree of grafting depends on the ratio silylation agent to SiOH groups. As shown by Fourier transform diffuse reflectance mode spectroscopy only free silanol groups react with modifier.
机译：有机-无机复合材料的合成是通过用氯邻二甲基苯基硅烷和二氯甲基苯基硅烷对介孔材料类型MCM-41进行表面改性来进行的。应用红外光谱，低温氮吸附/解吸（等温线BET），热重分析以及甲苯和水的竞争性吸附技术，表明了甲硅烷基化的程度，疏水性，表面和体积特性（孔径分布，孔体积） ）在很大程度上取决于甲硅烷基化剂的性质以及硅烷醇基团与改性剂的计算量之比。发生两种类型的缩合反应：（1）改性剂与表面硅烷醇基团的反应，和（2）改性剂的分子间缩合，导致额外的孔堵塞。只有24-36％的表面硅烷醇基团与改性剂反应。该材料在高达约170℃的温度下是稳定的，该温度高于相应的聚合树脂。 TG / DTA数据可以得出结论，接枝度取决于甲硅烷基化剂与SiOH基团的比例。如傅里叶变换漫反射模式光谱所示，只有游离的硅烷醇基团与改性剂反应。

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