Influence of solution conditions on formation of amphiphilic hyperbranched polyanion/linear polycation multilayer films |
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Authors: | Liming Tang Teng Qiu Xinlin Tuo Hu You Deshan Liu Xianlai Tang |
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Affiliation: | (1) Department of Chemical Engineering, Tsinghua University, 100084 Beijing, China;(2) College of Materials Science and Engineering, Beijing University of Chemical Technology, 100029 Beijing, China;(3) College of Science and Biotechnology, Guangxi University, 530005 Nanning, China |
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Abstract: | Amphiphilic hyperbranched polyester (P2) consisting of a hydrophobic core, surrounded by aromatic carboxylic acids, is self-assembled into aggregates in aqueous solution at pH region of 3.8–4.7 and in THF–water mixed solution at THF/water volume ratio of 1/100–1/10. With P2 in both aqueous and THF–water mixed solution as polyanion and linear poly(diallydimethylammonium chloride) (PDAC) as polycation, self-assembled films were successfully formed by layer-by-layer dipping. The solution condition of P2, including the pH of aqueous solution and the THF/water volume ratio, affected not only the absorption behavior of P2 but also the surface morphology and hydrophilicity of the films with P2 as the outmost layer. At lower pH or higher THF/water volume ratio the aggregation of P2 in solution was enhanced, thus resulting in higher adsorption rate for P2, more rough and less hydrophilic surface for the films. |
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Keywords: | Amphiphilic hyperbranched polymer Self-assembly film Solution condition Surface morphology Surface hydrophilicity |
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