Reference : Dielectric investigations of a chiral monomer and side chain polymer
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/10993/20565
Dielectric investigations of a chiral monomer and side chain polymer
English
Gouda, F. [> >]
Kutub, Abdul A [> >]
Fodor-csorba, K. [> >]
Galli, G. [> >]
Chiellini, E. [> >]
Komitov, L. [> >]
Lagerwall, Jan mailto [Chalmers University of Technology]
Lagerwall, Sven T. [> >]
2000
Molecular Crystals & Liquid Crystals
Taylor & Francis Ltd
352
169-177
Yes (verified by ORBilu)
International
1542-1406
1543-5318
[en] The dynamics of different collective and non-collective modes in a chiral liquid crystalline monomer and its side-chain polymer have been studied by dielectric spectroscopy. The monomer system enabled us to study the temperature dependence of the dielectric permittivity when crossing the transition from the SmA* phase directly to the crystal phase. Although the polymer system has a SmA* to SmC* transition, we found that the temperature dependence of the dielectric permittivity is radically different from the normally observed behaviour in these phases. The contributions from the soft and Goldstone modes, respectively, are extremely low, a result which is related to the very low value of the spontaneous polarization of the material. At lower temperatures in the SmC* phase, a very weak dielectric absorption located around 50 kHz is observed and discussed in terms of the liberational motion of side chains around the polymer main chain.
http://hdl.handle.net/10993/20565

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