Polymerization of Rodlike Micelles

Steven R. Kline
NIST Center for Neutron Research, Building 235, Room E151, Gaithersburg, Maryland 20899
Langmuir, 1999, 15 (8), pp 2726–2732
DOI: 10.1021/la981451o
Publication Date (Web): March 19, 1999
Copyright Not subject to U.S. Copyright. Published 1999 American Chemical Society

Abstract

A new polymerizable surfactant, cetyltrimethylammonium 4-vinylbenzoate (CTVB), has been prepared and investigated. In aqueous solution, highly entangled rodlike aggregates are formed at millimolar surfactant concentrations. Free-radical polymerization of the surfactant counterions results in nearly complete conversion to a stable, nonviscous solution. Small-angle neutron scattering reveals that the micellar diameter of 40 Å is unchanged during the polymerization process and that the final polymerized micelle length (400−1200 Å) is determined by the relative initiator concentration. In addition, the parent rodlike micellar aggregates rearrange into spherical micelles at elevated temperature, whereas the polymerized structures are insensitive to temperature changes or dilution.

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History

  • Published In Issue April 13, 1999
  • Received October 16, 1998
    Revised February 4, 1999

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