Preparation of newly designed reverse mode polymer dispersed liquid crystals and its electro-optic characteristics

Abstract

Polymer Dispersed Liquid Crystal (PDLC) films, of which the liquid crystal has negative dielectric anisotropy, were prepared from the phase separation between liquid crystal (MJ001317) and the various compositions of resins by common polymerization induced phase separation method. In this work, the effects of resin compositions have been systematically investigated. It was found that the morphology and size of droplets related to electro-optic properties mainly depend on the rate of polymerization and cross-linking density for each resin composition. A reverse mode PDLC films developed from a new formulation containing TPGDA/EHA/HMPPO showed the good off-state transmittance, contrast ratio (19:1), and relatively low driving voltage (10 V).