P‐111: Effect of Pressure on Polymer Stabilized Cholesteric Texture Light Shutter

Abstract

In this work, we study the effects of pressure on polymer stabilized cholesteric texture (PSCT) normal‐mode light shutter. The externally applied pressure may damage the polymer network and thus change the orientation of the liquid crystal and produce undesired haze in the transparent state. Through material formulation, we developed new PSCT systems that have better resistance to external pressure. We also explored methods to repair damaged polymer network.

Polymer Stabilized Cholesteric Liquid Crystal for Switchable Windows

“…The normal mode polymer stabilized cholesteric texture material is made from a mixture of a ChLC with a positive dielectric anisotropy (De H 0) and a small amount of monomers [22,23,[26][27][28]. The pitch of the ChLC is a few microns ($0.5-5 mm).…”

“…When a dual frequency LC is used in the bistable mode PSCT, a low frequency voltage switches the material from the focal conic texture to the homeotropic texture and a high frequency voltage switch the material from the homeotropic texture to the focal conic texture. Figure 16.15 shows the response of the bistable mode PSCT window to applied voltages [28]. The dielectric anisotropy of the material is about þ 2.2 at 100 Hz and À2.0 at 20 kHz.…”