Electro-Optical Effect of Varied SCLCP/LC Blend Systems

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Abstract
Varied blend systems containing Imine-based side chain liquid crystalline polysiloxanes or ladderlike polysilsesquioxanes and corresponding low mass liquid crystal (LC) analogues were prepared by blending or crude solution mixing. In later case, in situ crosslinking took place by hydrolysis and further condensation of remained Si-H groups in the macromolecules. Electro-optic measurement results indicate rise time and optical contrast of the blend system are related to the polarity and applied voltage: the blend system containing a weak polar component exhibits lower optical contrast and “recovery” effect, meanwhile, strong polar blend system exhibits “memory” effect; short rise time and lower driving voltage for the PNLC (Polymer Network Liquid Crystal) system containing low content of polymer are similar to that of ordinary low mass LC system. Some peculiar behaviour may be caused by the “anchoring” effect and elastic deformation of the cavity. The blend system containing ladderlike polysilsesquioxane exhibits sharp electro-optic behaviour and distinct thresold voltage.