Synthesis of polystyrene latex with amphoteric surfactant and its characterization |
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| Authors: | K Kato H Kondo A Morita K Esumi K Meguro |
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| Institution: | (1) Present address: Department of Applied Chemistry and Institute of Colloid and Interface Science, Science University of Tokyo, Tokyo, Japan |
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| Abstract: | An emulsion polymerization of styrene in the presence of an amphoteric surfactant; N,N-dimethyl-n-laurylbetaine (LNB) was carried out at pH 7.0. The polymerization rate and the concentration of the latex particle were proportional to the LNB concentration of 0.6 power. The latex particle sizes became smaller with increasing concentrations of LNB. The molecular weights of polystyrene latices increased with the concentration of LNB. The zeta-potentials of latex particles were significantly dependent on the pH, and showed the existence of an isoelectric point. |
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| Keywords: | Amphoteric surfactant emulsion polymerization latex zeta-potential (ZP) |
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