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Synthesis and characterization of imidized poly(styrene‐maleic anhydride) nanoparticles in stable aqueous dispersion
Author(s) -
Samyn Pieter,
Deconinck Marlies,
Schoukens Gustaaf,
Stanssens Dirk,
Vonck Leo,
Van den Abbeele Henk
Publication year - 2012
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1871
Subject(s) - maleic anhydride , materials science , polymer chemistry , thermal stability , aqueous solution , styrene , nanoparticle , dispersion (optics) , chemical engineering , thermogravimetric analysis , raman spectroscopy , organic chemistry , copolymer , polymer , chemistry , composite material , nanotechnology , physics , optics , engineering
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.