Synthesis of poly(styrene‐co‐4‐vinylpyridine) microspheres via dispersion polymerization: Effect of the concentration of 4‐vinylpyridine |
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| Authors: | Hyekyung Han Chang Kook Hong Jinho Hong Dong Wha Park Sang Eun Shim |
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| Affiliation: | 1. Department of Chemical Engineering, Inha University, 253 Yonghyundong, Namgu, Incheon, South Korea 402‐751;2. School of Applied Chemical Engineering, Chonnam National University, 300 Yongbong‐dong, Puk‐gu, Gwangju, South Korea 500‐757 |
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| Abstract: | Amphiphilic copolymer microspheres of poly(styrene‐co‐4‐vinylpyridine) were prepared by dispersion polymerization in an alcohol/water medium. The synthesis of poly(styrene‐co‐4‐vinylpyridine) microparticles was successfully carried out, and the latexes had a spherical morphology with good monodispersity. The degree of conversion in the early stage of polymerization decreased with increasing 4‐vinylpyridine (4VP) monomer content, but the final conversions were similar (>95%). The copolymerization rate decreased with increasing 4VP content, and a broad particle size distribution was observed with 20 wt % 4VP because of the prolonged nucleation time. With the 4VP concentration increasing, the molecular weight of the copolymer microspheres decreased, and the glass‐transition temperature of the copolymers increased; this indicated that all the copolymers were random and homogeneous. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 |
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| Keywords: | colloids copolymerization dispersions particle size distribution polystyrene |
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