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Ultrasonically irradiated emulsion polymerization of styrene in the presence of a polymeric surfactant

Authors

  • Jingzhi Zhang,

    1. State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
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  • Ya Cao,

    Corresponding author
    1. State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
    • State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
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  • Yuhui He

    1. State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
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Abstract

A polymeric surfactant based on carboxymethyl cellulose and alkyl poly(etheroxy) acrylate (CMC-A9) was used in ultrasonically irradiated emulsion polymerization of styrene. Polystyrene nanoparticles (30–60 nm) with high molecular weight were prepared. Compared with the conventional emulsion polymerization, the introduction of CMC-A9 in the polymerization yielded higher monomer conversion in a shorter time and under lower ultrasonic power output. A single latex particle contained only a few polymer chains with average chain numbers of 2–19. The particle size and polymer chain per particle could be controlled by changing the concentration of CMC-A9 and SDS. The effect of CMC-A9 and SDS on ultrasonically irradiated emulsion polymerization kinetics was studied. The results indicated that the ultrasonically irradiated emulsion polymerization had a similar nucleation mechanism to a miniemulsion polymerization system. This is attributed to the high ratio of radicals and a great number of smaller sizes of monomer droplets produced under ultrasonic irradiation. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 763–768, 2004

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