Spontaneous photoinduced formation of hybrid polymer films with functionalized macroporous patterns

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• 作者：Abraham Chemtob ; Lingli Ni ; C¨¦line Dietlin ; C¨¦line Croutx¨¦-Barghorn ; Patrick Kitzmann ; Maurice Brogly ; Lo?c Vidal
• 关键词：Macroporous ; Sol&ndash ; gel ; Hybrid film ; UV irradiation ; Confocal Raman spectroscopy ; Conformational order
• 刊名：Surface and Coatings Technology
• 出版年：2012
• 出版时间：25 September, 2012
• 年：2012
• 卷：209
• 期：Complete
• 页码：64-72
• 全文大小：2114 K

文摘

Sol-gel phase separation of 3-(glycidyloxypropyl)trimethoxysilane (GPTMS) in presence of a long-chain hydrophobic precursor ((H₃C(CH₂)_n ? 1Si(OCH₃)₃), n = 12-16) served to synthesize macroporous hybrid films, without the requirement of any template or additives. The method used was both simple and fast; proceeding through a sol-gel process triggered by UV light, and based on efficient Br?nsted supercid photocatalysts. The film surface was characterized by a three-dimensional network of relatively well-defined and homogeneously dispersed micro- or nanopatterns as assessed by a variety of microscopy techniques. The concentration and structure of the n-alkylsilane as well as the film thickness were critical parameters in controlling the macrostructuration and the size of the perforations. Time-resolved Fourier transformed infrared spectroscopy allowed to probe in situ the compositional changes during the sol-gel process. By using spatially-resolved confocal Raman spectroscopy, we showed a preferential localization of the condensed n-alkylsiloxane species at the surface of the pores to form conformationally ordered monolayers. This self-assembly process was presumably driven by the surfactant properties of the hydrolyzed alkylsilane species formed in situ and stabilizing the macropores.