Electro-optics of polymer dispersed ferroelectric liquid crystals

Zyryanov, V. Ya.; Smorgon, S. L.; Shabanov, V. F.

doi:10.1080/00150199308008338

Cited by 13 publications

(9 citation statements)

References 3 publications

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“…Optical response time increases dramatically at lower voltages, and measured polarization decreases when higher UV intensities are used to increase the polymerization rate 181. Electrooptic characterizations of these systems have also been reported [20,21].…”

Section: Introductionmentioning

confidence: 99%

Phase behaviour and electro-optic characteristics of a polymer stabilized ferroelectric liquid crystal

et al. 1995

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The effects of adding a diacrylate monomer or its polymerized network to a ferroelectric liquid crystal have been characterized. The monomer lowers the temperatures of transition to the more ordered phases, whereas the polymer network phase separates into polymer rich and LC rich phases and has little effect on the LC phase behaviour. Ferroelectric polarization decreases comparably in both monomer and networked systems. As the network concentration increases, the size of LC domains decreases considerably. With low concentrations of polymer and, thus large LC domains, optical response and tilt angle remain fairly independent of polymer concentration, but as the polymer concentration increases, switching speed and tilt angle decrease dramatically. Polymerization rate maxima increase with monomer concentration until saturation of monomer in the liquid crystal is reached. The rate maxima then decrease as monomer must diffuse from monomer rich droplets. Double bond conversion during the polymerization is comparable for all monomer concentrations below 50 per cent.

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Section: Introductionmentioning

confidence: 99%

Phase behaviour and electro-optic characteristics of a polymer stabilized ferroelectric liquid crystal

et al. 1995

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“…37 Systems have been developed which incorporate both cholesteric and nematic LCs 26,27,[29][30][31][32]41 as well as fast switching 43,44 ferroelectric LCs (FLCs). 28,31,[33][34][35][36][37][38][39][40]42 PDLCs are characterized by a large amount of polymer (usually >10%) dispersing the liquid crystal, usually into elliptical or spherical droplets. PSLCs, on the other hand, have relatively little polymer (<5%) which is primarily used for mechanical or electro-optical stabilization.…”

Section: Introductionmentioning

confidence: 99%

Polymerization Behavior and Kinetics during the Formation of Polymer-Stabilized Ferroelectric Liquid Crystals

Guymon

Bowman

1997

Macromolecules

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The effects of photopolymerizing both mesogenic and nonmesogenic diacrylate monomers in ferroelectric liquid crystalline media were characterized. By using monomers with a variety of different physical and optical properties, the influence of the monomer as well as the ordered media was determined. Polymerization rate profiles and double-bond conversions were monitored at different temperatures and in different liquid crystalline phases. As the order of the media increased, the polymerization rates also increased dramatically for all of the monomers studied, despite large decreases in temperature. Solution polymerizations in the liquid crystal at temperatures for which the liquid crystal molecules are isotropically distributed and in an isotropic solvent were much slower and exhibited maximum rates less than one-third those observed in ordered phases. To elucidate the mechanisms behind this behavior, the kinetic constants of both the termination and propagation reactions were determined. For certain monomers, the rate increase was driven by a decrease in the termination kinetic constant causing an increase in the radical concentration. On the other hand, other monomer polymerizations in ordered phases exhibited an increase in both termination and propagation kinetic constants. The effects of increasing monomer concentration in the ferroelectric liquid crystal were also investigated.

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“…The manufacturing technique of the films have been optimized to obtain maximum anisotropy of its transmittance. The data on preparing methods, composition of UOF PDFLC films, and their structural, optical and electric properties is submitted in [24][25][26][27][28][29][30]. The high optical anisotropy of UOF PDFLC film is achieved only in the samples with the droplets possessing a wavy type structure (Fig.…”

Section: Uniaxially Oriented Pdflc Filmsmentioning

confidence: 99%

“…Firstly, PDFLC films can be used as a phase plate placed in traditional layout between two polarizers. The second method is based on light scattering effect [22][23][24][25][26][27][28][29][30]. The light scattering PDFLC modulators in its turn may be both with a single-polarizer [22][23][24][25][26]29,30] and polarizer-free [27].…”

Section: Uniaxially Oriented Pdflc Filmsmentioning

confidence: 99%

“…Characteristics of PDFLC films depending on material constants of FLC and polymer, smectic structure inside droplets, morphology of the film and parameters of control field have been studied [24][25][26][27][28][29][30]. The manufacturing technique of the films have been optimized to obtain maximum anisotropy of its transmittance.…”

Section: Uniaxially Oriented Pdflc Filmsmentioning

confidence: 99%

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Uniaxially Oriented Films of Polymer Dispersed Liquid Crystals: Textures, Optical Properties and Applications

Zyryanov

Barannik

Presnyakov

et al. 2005

Molecular Crystals and Liquid Crystals

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Overview of authors works on uniaxially oriented films (UOF) of polymer dispersed liquid crystals (PDLC) including nematics, cholesterics and ferroelectric smectics are presented. The interference effects such as the oscillations of volt-contrast curves and the quenching of a light transmitted through the nematic PDLC are described. Exceptional behaviour of polarization efficiency revealed in sheared cholesteric PDLC films alive is discussed. We have found the electro-thermooptical hysteresis in cholesteric PDLC and proposed laser-addressed reverse information recording based on it. Structure, optical, dynamic and temperature properties of UOF PDLC based on ferroelectric smectics are presented. Using this material, a single-polarizer and three different types of polarizer-free light modulators were designed.

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Electro-optics of polymer dispersed ferroelectric liquid crystals

Cited by 13 publications

References 3 publications

Phase behaviour and electro-optic characteristics of a polymer stabilized ferroelectric liquid crystal

Phase behaviour and electro-optic characteristics of a polymer stabilized ferroelectric liquid crystal

Polymerization Behavior and Kinetics during the Formation of Polymer-Stabilized Ferroelectric Liquid Crystals

Uniaxially Oriented Films of Polymer Dispersed Liquid Crystals: Textures, Optical Properties and Applications

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