Polymerisation in lyotropic liquid-crystalline phases of dioctadecyldimethylammonium bromide |
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Authors: | M Jung A L German H R Fischer |
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Institution: | (1) Laboratory of Polymer Chemistry and Coatings Technology Eindhoven University of Technology P.O. Box 513, 5600 MB Eindhoven The Netherlands, NL;(2) TNO-TPD Materials Chemistry and Coatings, P.O. Box 595 5600 AN Eindhoven, The Netherlands, NL |
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Abstract: | The polymerisation of styrene in lyotropic liquid-crystalline (LC) phases of dioctadecyldimethylammonium bromide (DODAB)
in water is explored. Amphiphile concentrations between 20 and 50 wt % are employed. The study is set out as a model study
for polymerisation reactions in nonstabilised, nonfunctional bilayer systems. X-ray characterisation was used to assess the
phase behaviour of the lyotropic mesophases before, during and after polymerisation. The DODAB/water system forms the lamellar
phase within the concentration range considered. Addition of styrene to the lamellar phase of DODAB at an equimolar ratio
induces a phase shift to a bicontinuous cubic phase at elevated temperatures near the phase-transition temperature. Upon polymerisation
within this cubic phase, the phase structure is maintained if the system is kept at constant temperature; however, if the
polymer/amphiphile phase is cooled, the lamellar phase, being typical of the DODAB/water system, is restored. It is concluded
that, as a result of phase separation between the polymer and the amphiphile phase, the polymerisation in lyotropic LC phases
does not provide a stable copy of the templating amphiphile phase. This is in analogy to the observations for polymerisations
in other lyotropic phases.
Received: 16 March 2000 Accepted: 1 July 2000 |
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Keywords: | Polymerisation in lyotropic surfactant phases Interaction of polymers with lyotropic surfactant phases Ternary cubic phases of dioctadecyldimethylammonium bromide |
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