pH-Responsive Thin Film Membranes from Poly(2-vinylpyridine): Water Vapor-Induced Formation of a Microporous Structure

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• 作者：Maxim Orlov ; Ihor Tokarev ; Andreas Scholl ; Andrew Doran ; Sergiy Minko
• 刊名：Macromolecules
• 出版年：2007
• 出版时间：March 20, 2007
• 年：2007
• 卷：40
• 期：6
• 页码：2086 - 2091
• 全文大小：851K
• 年卷期：v.40,no.6(March 20, 2007)
• ISSN：1520-5835

文摘

We report the fabrication of microporous thin film membranes with two-dimensionally arrangedsubmicron pores whose size can be varied by changing pH of aqueous medium. A solution containing poly(2-vinylpyridine) partially quaternized with 1,4-diiodobutane (qP2VP) and unreacted 1,4-diodobutane (DIB) wasused for the formation and deposition of the membranes on solid substrates. The membranes were spin-coatedonto solid substrates in a controlled humid environment. The presence of water vapor in air was found to be anecessary condition for the pore formation. We studied the influence of relative humidity on the membranemorphology and proposed a mechanism of pore formation. Cross-linking the qP2VP membranes with DIB madethem insoluble (stable) in organic solvents and acidic water. The cross-linked membranes demonstrated pH-dependent swelling, which had a strong influence on the pore size.