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|Title:||Microemulsion polymerization of styrene for obtaining high ratios of polystyrene/surfactant|
|Citation:||Xu, X.J., Chew, C.H., Siow, K.S., Wong, M.K., Gan, L.M. (1999-11-09). Microemulsion polymerization of styrene for obtaining high ratios of polystyrene/surfactant. Langmuir 15 (23) : 8067-8071. ScholarBank@NUS Repository. https://doi.org/10.1021/la9904152|
|Abstract:||A modified ternary microemulsion polymerization was successfully used to prepare nanosized polystyrene (PS) microlatexes with high PS/surfactant weight ratios of up to 14:1. Cationic surfactants used were alkyltrimethylammonium bromides, CnTAB, where n is either 12, 14, or 16. A water-soluble initiator was used for the polymerization at room temperature, with moderate stirring. The latexes obtained are bluishopaque and have been stable now for about 8 months. The process produced rather uniform (Dw/Dn ≅ 1.10) latex particles of about 40 nm having high molar masses of PS ranging from 1.0 to 2.2 × 10-6 g/mol. This was obtained by first generating monomer-starved latex particles in a ternary microemulsion containing only 0.5-1.0 wt % styrene 1.0 wt % cationic surfactant. The subsequent supply of styrene monomer to the polymerized microemulsion was delivered either through dropwise addition or via hollow-fiber feeding of monomer. The latter method was employed for the first time.|
|Appears in Collections:||Staff Publications|
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