Bistable polymer-dispersed cholesteric liquid crystal thin film enabled by a stepwise polymerization

RSC Advances ◽  
2015 ◽  
Vol 5 (73) ◽  
pp. 58959-58965 ◽  
Author(s):  
Huihui Wang ◽  
Ling Wang ◽  
Mei Chen ◽  
Tongda Li ◽  
Hui Cao ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Liquid Crystal ◽  
Cholesteric Liquid Crystal ◽  
Polymer Network ◽  
Dielectric Anisotropy ◽  
Polymer Dispersed Liquid Crystal ◽  
Polymer Dispersed ◽  
Photo Curing

By using a proper polymer network and an ion-doped cholesteric liquid crystal with negative dielectric anisotropy, bistable polymer-dispersed liquid crystal thin films were prepared by first photo-curing, and then thermally curing.

Preparation and Optical Properties of a Reverse-Mode Polymer Dispersed Liquid Crystal Film

1992 ◽  
Vol 277 ◽  
Author(s):  
Tomohisa Gotoh ◽  
Hideya Murai ◽  
Etsuo Hasegawa ◽  
Katsuhiro Mizoguchi
Keyword(s):  
Liquid Crystal ◽  
Porous Polymer ◽  
Dielectric Anisotropy ◽  
Distinct Advantage ◽  
Dual Frequency ◽  
Uv Curable ◽  
Polymer Dispersed Liquid Crystal ◽  
Reverse Mode ◽  
Polymer Dispersed ◽  
Substitution Type

ABSTRACTTwo new types of reverse-mode polymer-dispersed liquid crystal films have been developed and successfully produced. The first was produced by UV-curing of a mixture of dual frequency addressable liquid crystal (DFALC) and UV-curable polymers under an applied voltage at a frequency lower than the crossover frequency (fc) of the DFALC. This first type is referred to as a dual frequency type. The second type was produced by injecting a liquid crystal having negative dielectric anisotropy into a specially prepared porous polymer film from which liquid crystal having positive dielectric anisotropy had previously been extracted. The type thus produced through such “negative-for-positive” substitution is referred to as a substitution type. While the dual frequency type can not be driven at a low frequency, substitution type can, which gives it a distinct advantage. Other electro-optic characteristics of the two types of films, including alignment properties of the liquid crystal molecules, are also discussed.

Reverse mode operation polymer dispersed liquid crystal with a positive dielectric anisotropy liquid crystal

2010 ◽  
Vol 49 (4) ◽  
pp. 257-262 ◽  
Author(s):  
Daniela Cupelli ◽  
Fiore P. Nicoletta ◽  
Giovanni De Filpo ◽  
Patrizia Formoso ◽  
Giuseppe Chidichimo
Keyword(s):  
Liquid Crystal ◽  
Dielectric Anisotropy ◽  
Polymer Dispersed Liquid Crystal ◽  
Mode Operation ◽  
Reverse Mode ◽  
Polymer Dispersed

Switchable Bragg Gratings Formed in Situ Within a Polymer-Dispersed Liquid Crystal Composite Medium

1996 ◽  
Vol 425 ◽  
Author(s):  
R. L. Sutherland ◽  
L. V. Natarajan ◽  
T. J. Bunning ◽  
V. P. Tondiglia ◽  
W. W. Adams
Keyword(s):  
Liquid Crystal ◽  
Wave Theory ◽  
Acrylate Monomer ◽  
Polymer Dispersed Liquid Crystal ◽  
Unique System ◽  
Polymer Dispersed ◽  
Potential Applications ◽  
Microscopic Morphology ◽  
Photo Curing

AbstractHolographic photo-curing of a penta-acrylate monomer-liquid crystal mixture forms a unique system of liquid crystal microdomains confined to Bragg planes. We examine the physics of this structure as it relates to the formation of electrically switchable holograms, for which many potential applications exist. The results of scanning electron microscopy and laser characterization studies lead to the development of concepts and models for explaining the microscopic morphology and electro-optical properties of these holograms. We find that a model incorporating a shaped-droplet analysis of the electro-mechanical properties of LC domains combined with standard coupled-wave theory of holography offers good numerical agreement with diffraction efficiency data for ppolarized probe light.

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