Self-Assembly of a Bridged Silsesquioxane Containing a Pendant Hydrophobic Chain in the Organic Bridge

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• 作者：Herná ; n E. Romeo ; Marí ; a A. Fanovich ; Roberto J. J. Williams ; Libor Mat//pubs.acs.org/images/entities/ecaron.gif" border="0">jka ; Josef Ple//pubs.acs.org/imag
• 刊名：Macromolecules
• 出版年：2007
• 出版时间：March 6, 2007
• 年：2007
• 卷：40
• 期：5
• 页码：1435 - 1443
• 全文大小：568K
• 年卷期：v.40,no.5(March 6, 2007)
• ISSN：1520-5835

文摘

The aim of this study was to synthesize and characterize the self-assembly of a new family ofbridged silsesquioxanes containing a pendant hydrophobic chain in the organic bridge. The precursor of thishybrid was obtained by the reaction of glycidoxypropyl(trimethoxysilane) (GPMS) (2 mol) with dodecylamine(1 mol). Polycondensation was produced with formic acid, either in mass or using tetrahydrofuran or isopropanolas solvents. The resulting bridged silsesquioxane was characterized by the presence of both ordered and disordereddomains. Experimental evidence obtained from SAXS, WAXS, ²⁹Si NMR, FTIR, HRTEM, and SAED techniquessuggested that the basic structure of ordered domains consisted of hybrid organic-inorganic multilayers separatedby hydrophobic regions with a thickness equal to the length of a tail-to-tail association of dodecylamine chainsin all-trans conformations. To our knowledge, this is the first example of the presence of this kind of structurein a cross-linked hybrid material. A hierarchical organization of ordered domains into semicylindrical shells wasobserved in a microscopic scale. Because of the presence of pendant hydrophobic chains, the precursor of thishybrid material may be used for the dispersion of hydrophobic molecules or of nanoparticles stabilized byhydrophobic chains.