Preparation and size control of monodispersed surface charged polystyrene nanoparticles by reversible addition fragmentation transfer reaction |
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Authors: | Jusung Kim Juho Kwak Young Chul Kim Dukjoon Kim |
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Institution: | (1) Department of Chemical Engineering, Polymer Technology Institute, Sungkyunkwan University, 300 Chunchun-dong, Jangan-gu, Suwon, Kyunggi, 440-746, South Korea;(2) Sung-Rim Chemical Co., Ltd, Incheon, 404-818, South Korea;(3) College of Environment and Applied Chemistry, Kyung Hee University, Youngin, Kyunggi, 449-701, South Korea |
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Abstract: | Highly monodispersed polystyrene (PS) nanoparticles were prepared via reversible addition fragmentation transfer (RAFT) living radical emulsion polymerization technique. Two types of novel sur-iniferters with different hydrophilic lipophilic balance (HLB) values, 4-diethythiocarbonylsulfanylmethyl-benzoic acid and 4-(2-hydroxyethyl)piperazine-1-carbodithioicacid benylether, were synthesized for the PS RAFT reaction and their chemical synthesis was identified using nuclear magnetic resonance spectroscopy. Scanning electron microscope and dynamic light scattering experiments showed that the size distribution of the particles prepared was highly monodispersed. The average particle size was affected by the type and concentration of sur-iniferters. It increased with decreasing sur-iniferter concentrations, and the use of sur-iniferters with higher HLB values led to increases of particle sizes, as the particles were growing from, initially, much larger monomer droplets. The surfaces of the nano particles prepared were ionically charged. The surface charge measured was −50 mV, which enabled particles to be stably dispersed in aqueous medium. |
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Keywords: | Mnodisperse Particle Emulsion RAFT Nano |
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