Phase Separation in Sol-Gel Systems of Organic-Inorganic Hybrids
Phase Separation in Sol-Gel Systems of Organic-Inorganic Hybrids
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DOI：
10.4028/www.scientific.net/ast.45.759
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发表时间：
2006-10
期刊：
影响因子：
--
通讯作者：
K. Nakanishi;K. Kanamori
中科院分区：
文献类型：
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作者：
K. Nakanishi;K. Kanamori
通过溶胶-凝胶法结合聚合诱导相分离合成了具有明确大孔和/或介孔的有机-无机杂化整体材料。使用烷基三烷氧基硅烷和亚烷基桥连的烷氧基硅烷，两种不同类别的有机硅氧烷网络的特点是在大孔性的基础上相分离，以及介孔性的基础上超分子模板表面活性剂。烷基封端的聚硅氧烷网络表现出显著的表面疏水性以及机械柔性。另一方面，亚烷基桥接的网络表现得更类似于从四烷氧基硅烷制备的那些关于表面亲水性，机械刚性和介孔形成能力。超分子模板化介孔嵌在凝胶骨架中，形成了一个有序的大孔网络，可以合成出多种具有层次结构的大孔-介孔有机-无机杂化材料。
Organic-inorganic hybrid monoliths with well-defined macropores and/or mesopores have been synthesized by a sol-gel process accompanied by polymerization-induced phase separation. Using aklyltrialkoxysilanes and alkylene-bridged alkoxysilanes, two different categories of organo-siloxane networks have been characterized in view of macroporoisity based on phase separation as well as mesoporosity based on supramolecular templating by surfactants. The alkyl-terminated polysiloxane network exhibited substantial surface hydrophobicity together with the mechanical flexibility. On the other hand, the alkylene-bridged network behaved much more similarly to those prepared from tetraalkoxysilanes with regard to surface hydrophilicity, mechanical rigidness and mesopore-forming ability. Supramolecular templating of mesopores embedded in the gel skeletons comprising well-defined macroporous network has proven to give wide variety of hierarchically designed macro-mesoporous organic-inorganic hybrid materials.