Sol-Gel Synthesis of Hybrid Organic-Inorganic Materials. Hexylene- and Phenylene-Bridged Polysiloxanes

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• 作者：Douglas A. Loy ; Gregory M. Jamison ; Brigitta M. Baugher ; Sharon A. Myers ; Roger A. Assink ; and Kenneth J. Shea
• 刊名：Chemistry of Materials
• 出版年：1996
• 出版时间：March 1996
• 年：1996
• 卷：8
• 期：3
• 页码：656 - 663
• 全文大小：610K
• 年卷期：v.8,no.3(March 1996)
• ISSN：1520-5002

文摘

New highly cross-linked polysiloxanes were prepared by sol-gelpolymerization of 1,6-bis(diethoxymethylsilyl)hexane (1) and1,4-bis(diethoxymethylsilyl)benzene (2).Hydrolysisand condensation of 1 and 2 under acidic andbasic conditions with 4 equiv of water led tothe rapid formation of hexylene- and phenylene-bridged polysiloxanegels. The dry gels(xerogels) were intractable, insoluble materials that were noticeablyhydrophobic, exhibitingno swelling in organic solvents or water. Most of the xerogelswere high surface area,mesoporous materials. Hexylene-bridged polysiloxanes preparedunder acidic conditionswere always nonporous regardless of whether they wereprocessed to afford xerogels orsupercritically dried as aerogels. Hexylene-bridged polysiloxanesprepared under basicconditions and all of the phenylene-bridged polysiloxanes weremesoporous with surfaceareas as high as 1025 m²/g.