Mixed Polymer Brushes by Sequential Polymer Addition: Anchoring Layer Effect

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• 作者：John Draper ; Igor Luzinov ; Sergiy Minko ; Igor Tokarev ; and Manfred Stamm
• 刊名：Langmuir
• 出版年：2004
• 出版时间：May 11, 2004
• 年：2004
• 卷：20
• 期：10
• 页码：4064 - 4075
• 全文大小：933K
• 年卷期：v.20,no.10(May 11, 2004)
• ISSN：1520-5827

文摘

Smart surfaces can be described as surfaces that have the ability to respond in a controllable fashionto specific environmental stimuli. A heterogeneous (mixed) polymer brush (HPB) can provide a syntheticroute to designing smart polymer surfaces. In this research we study HPB comprised of end-graftedpolystyrene (PS) and poly(2-vinyl pyridine) (P2VP). The synthesis of the HPB involves the use of an"intermolecular glue" acting as a binding/anchoring interlayer between the polymer brush and the substrate,a silicon wafer. We compare anchoring layers of epoxysilane (GPS), which forms a self-assembled monolayerwith epoxy functionality, to poly(glycidyl methacrylate) (PGMA), which forms a macromolecular monolayerwith epoxy functionality. The PS and P2VP were deposited onto the wafers in a sequential fashion tochemically graft PS in a first step and subsequently graft P2VP. Rinsing the HPB in selective solventsand observing the change in water contact angle as a function of the HPB composition studied the switchingnature of the HPB. Scanning probe microscopy was used to probe the topography and phase imagery ofthe HPB. The nature of the anchoring layer significantly affected the wettability and morphology of themixed brushes.