Authors Mahltig, B. ; Gohy, J.F. ; Jérome, R. ; Stamm, M.
Title Diblock Polyampholytes at the Silicon-Water Interface: Adsorption as a Function of Block Ratio and Molecular Weight
Date 26.03.2001
Number 9657
Abstract Polyampholytes are highly charged macromolecules carrying oppositely charged functional groups. This article reports on the adsorption of a weak diblock polyampholyte, poly(methacrylic acid)-<I>block</I>-poly[(dimethylamino)ethyl methacrylate], as a function of the copolymer composition and molecular weight. The adsorption experiments were performed on silicon substrates from aqueous polymer solutions at different pHs. The amount of adsorbed polyampholyte chains to the surface was determined by ellipsometry, whereas lateral structures were investigated by scanning force microscopy. A strong influence of pH on the adsorbed amount and the lateral structure formation at the surface was observed. Especially at the isoelectric point, drastic changes in adsorption behavior were detected. At low molecular weights, an increased adsorbed amount was detected, a behavior in contrast to common theoretical predictions. This phenomenon is explained by the high stability of absorbed micelles, which cover the silicon surface as a dense layer. We conclude that micelle formation is an important process for polyampholyte adsorption, which needs to be taken into account more explicitly. &copy; 2001 John Wiley &amp; Sons, Inc. J Polym Sci B: Polym Phys 39: 709-<br />718, 2001
Publisher Journal of Polymer Science: Part B: Polymer Physics
Citation Journal of Polymer Science: Part B: Polymer Physics 39 (2001) 709-718
Tags polyampholytes polyelectrolytes adsorption scanning force microscopy ellipsometry dilute aqueous-solution synthetic polyampholytes solid/liquid interface copolymer micelles polystyrene latex neutral polyampholyte hydrophobic block charged surface salt-sol

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