Authors Usov, D. ; Nitschke, M. ; Chitry, V. ; Ulbrich, K. ; Minko, S. ; Stamm, M.
Title Mixed Polymer Brushes with Thermal Response Amplified by Roughness
Date 01.09.2004
Number 12533
Abstract Surface immobilized poly(N-isopropyl acrylamide) (PNiPAAm) layers show reversible gradual change of water advancing contact angle from hydrophilic (<50°) at ambient temperature to hydrophobic (90-120°) above 40 °C. The receding water contact angle remains unchanged (about 40°) upon the thermal transition. In this report we describe an approach how to broaden the range of the thermal switching and simultaneously reduce the contact angle hysteresis. We use the concept of mixed polymer brushes covalently grafted to a rough substrate. The high roughness of the substrate amplifies the thermal switching of wettability, while presence of the second hydrophobic polymer in the brush elevates the receding contact angle and thus reduces the water contact angle hysteresis.<br /><br />Joint PMSE/POLY Poster Session: General Papers/New Concepts in Polymeric Materials<br />The 227th ACS National Meeting, Anaheim, CA, March 28-April 1, 2004
Publisher Polymeric Materials: Science and Engineering
Citation Polymeric Materials: Science and Engineering 90 (2004) 622-623

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