High dielectric polymer and its application on electro-optical Kerr effect of blue phase liquid crystal

Abstract

We present a high-dielectric polymer with a lateral fluorine group, and its dielectric constant exhibits larger than 20 at 1 kHz. This well-soluble polymer can solely stabilize blue phase liquid crystals (BPLCs) while reducing the operating voltage by 30% and increasing the Kerr constant by nearly 70.6%. The influence of the polymer's dielectric property on the operating voltage is investigated based on the potential distribution. The theoretical result predicts that the operation voltage can be further reduced by 50% when the dielectric constant of the chiral dopant is the same as the high-dielectric polymer. The potential application of high-dielectric materials for the improvement of BPLC devices is foreseeable.

Effect of a Trifluorophenyl-Based Monomer on the Electro-optic Performances of Polymer-Stabilized Blue Phase Liquid Crystals

“…Alternative way to reduce high operating voltage is the synthesis of new polymeric materials such as reactive monomers with different functionalities. To the best of our knowledge, the effects of fluoro-content monomers (with a stronger dipole moment) which may possess substantial effect on the properties of the PSBPLCs have seldom been investigated [42,43]. According to the literature, the partial replacement of fluoroacrylates in the monofunctional monomer composition induced a decrease in the free energy of PSBPLC on account of low surface tension of fluorinated polymer [42].…”