Dynamic processes in polymer-liquid crystal composites pp.853-870
Authors: (I. Drevenšek-Olenik, A. Petelin, M. Čopič, University of Ljubljana, Slovenia, and others)
Abstract: Polymer-liquid crystal composites exhibit many interesting dynamic phenomena associated with the mesoscopic size, large surface to volume ratio and strong deformations of the liquid crystal order imposed by the embedding polymer matrix. We show that orientational dynamics of liquid crystals in confined geometries can be conveniently studied by dynamic light scattering technique (DLS). DLS measurements provide information on the size and shape of the confinement volume, viscoelastic parameters of the liquid crystalline material within the confined matrix, and magnitude of the intrinsic structural field acting on the orientational order of the liquid crystalline state. Results of the DLS investigations are presented for two different composite structures: holographic polymer-dispersed liquid crystals (HPDLC) and liquid crystal elastomers (LCE). Comparison of the DLS response with electro-optical switching properties of the composites is made.