Synthesis and characterization of imidized poly(styrene‐maleic anhydride) nanoparticles in stable aqueous dispersion |
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Authors: | Pieter Samyn Marlies Deconinck Gustaaf Schoukens Dirk Stanssens Leo Vonck Henk Van den Abbeele |
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Institution: | 1. Department of Textiles, Ghent University, Technologiepark 907, B‐9052 Zwijnaarde, Belgium;2. Topchim N.V., Nijverheidsstraat 98, B‐2160 Wommelgem, Belgium |
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Abstract: | Organic nanoparticles are synthesized by partial imidization of high‐molecular weight styrene(maleic‐anhydride) with 26 to 34 mol% maleic anhydride, in aqueous environment and presence of ammonium hydroxide. The nanoparticle dispersions have a maximum solid content of 35 wt% and good stability that critically depends on the ratio of imidized and ammonolyzed maleic anhydride moieties. The deprotonated residual maleic anhydride moieties provide dispersion stability at pH > 4, while protonation at pH < 4 causes nanoparticle sedimentation. After presentation of the synthesis conditions, the imidization reaction is characterized by FT‐IR and Raman spectroscopy, followed by thermal analysis (TGA, DSC), and morphological characterization (DLS, SEM, TEM, AFM). The reaction conditions were optimized by physical characterization of various dispersions, and finally nanoparticles could be obtained with a maximum degree of imidization of 77% in dispersed conditions, or 90 to 95% after drying that are favorable for coating applications. Copyright © 2010 John Wiley & Sons, Ltd. |
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Keywords: | dispersions nanoparticles surfactants synthesis |
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