Ferroelectric polymer-dispersed liquid crystal

To produce novel LC phase behavior and properties, a variety of polymer/LC composites have been developed. These include systems which employ liquid crystal polymers (5), phase separation of LC droplets in polymer dispersed liquid crystals (PDLCs) (4), incorporating both nematic (5,6) and ferroelectric liquid crystals (6-10). Polymer/LC gels have also been studied which are formed by the polymerization of small amounts of monomer solutes in a liquid crystalline solvent (11). The polymer/LC gel systems are of particular interest, rendering bistable chiral nematic devices (12) and polymer stabilized ferroelectric liquid crystals (PSFLCs) (1,13), which combine fast electro-optic response (14) with the increased mechanical stabilization imparted by the polymer (75). [Pg.17]

It can be safely predicted that applications of liquid crystals will expand in the future to more and more sophisticated areas of electronics. Potential applications of ferroelectric liquid crystals (e.g. fast shutters, complex multiplexed displays) are particularly exciting. The only LC that can show ferroelectric property is the chiral smectic C. Viable ferroelectric displays have however not yet materialized. Antifer-roelectric phases may also have good potential in display applications. Supertwisted nematic displays of twist artgles of around 240° and materials with low viscosity which respond relatively fast, have found considerable application. Another development is the polymer dispersed liquid crystal display in which small nematic droplets ( 2 gm in diameter) are formed in a polymer matrix. Liquid crystalline elastomers with novel physical properties would have many applications. [Pg.465]

H.-S. Kitzerow, Polymer-dispersed liquid crystals, from the nematic curvilinear aligned phase to ferroelectric films, Liq. Cryst. 16, 1 (1994). [Pg.409]

This book was conceived as a renewed version of the earlier published original book, Electro-Optical and Magneto-Optical Properties of Liquid Crystals (Wiley, Chichester, 1983) written by one of us (L.M. Blinov). That book was first published in Russian (Nauka, Moscow, 1978) and then was modified slightly for the English translation. Since then new information on electrooptical effects in liquid crystals has been published. Novel effects have been discovered in nematics and cholesterics (such as the supertwist effect), and new classes of liquid crystalline materials, such as ferroelectric liquid crystals, appear. Recently, polymer liquid crystals attracted much attention and new electrooptical effects, both in pure polymer mesophases and polymer dispersed liquid crystals, were studied. An important contribution was also made in the understanding of surface properties and related phenomena (surface anchoring and bistability, flexoelectricity, etc.). [Pg.469]

Boiko N, Zhu X, Vinokur R, Rebrov E, Muzafarov A, Shibaev V (2000) New carbosilane ferroelectric liquid crystalline dendrimers. Mol Cryst Liq Cryst 352 342—350 Botiz I, Stingelin N (2014) Influence of molecular conformations and microstructure rat the optoelectronic properties of conjugated polymers. Materials 7 2273-2300 Bumiing TJ, Natarajan LV, Tondiglia VP, Sutherland RL (2000) Holographic polymer dispersed liquid crystals (HPDLCs). Armu Rev Mater Sci 30 83-115 Busch K, John S (1999) Liquid-crystal photonic-band-gap materials the tunable electromagnetic vacuum. Phys Rev Lett 83 967-970... [Pg.334]

Karapinar R, Neill MO, Hird M (2002) Polymer dispersed ferroelectric liquid crystal films with high electro-optic quality. J Phys D Appl Phys 35(9) 900-903 Kitzerow HS, Molsen H, Heppke G (1992) Linear electro-optic effects in polymer-dispersed ferroelectric liquid crystals. Appl Phys Lett 60 3093 Kossyrev PA, Qi J, Priezjev NV, Pelcovits RA, Crawford GP (2002) Virtual surface, director domain and the Freedericksz transition in polymer-stabilized liquid crystals. Appl Phys Lett 81 2986... [Pg.165]

H. S. Kitzerov, H. Molsen, and G. Heppke, Linear electro-optic effects in polymer-dispersed ferroelectric liquid crystals. Apll. Phys. Lett. 60, 3093-3095,1992. [Pg.386]

Effect of Polymer Network in Polymer Dispersed Ferroelectric Liquid Crystals (PSFLC)... [Pg.133]

Kundu S, Roy SS, Pal Majumder T, Roy SK (2000) Spontaneous polarization and response time of a polymer dispersed ferroelectric liquid crystal (PDFLC). Ferroelectrics 243 197-206 Lahiri T, Pal Majumder T (2011) Theoretical approach to study the effect of free volumes on the physical behavior of polymer stabilized ferroelectric liquid crystal molecules. J Appl Phys 109 114109... [Pg.165]

Lahiri T, Pal Majumder T (2012) The effect of cross-linked chains of polymer network on the memory states of polymer stabilized ferroelectric molecules. Polymer 53 2121-2127 Lee K, Suh SW, Lee SD (1994a) Fast linear electro-optical switching properties of polymer-dispersed ferroelectric liquid crystals. Appl Phys Lett 64 718 Lee K, Suh SW, Lee SD, Kim CY (1994b) Ferroelectric response of polymer-dispersed chiral smectic C liquid crystal composites. J Korean Phys Soc 27(1) 86... [Pg.165]

Miyazaki Y, Fume H, Takahashai T, Shikada M, Kobayashi S (2001) Mesogenic polymer-stabilized FLCDs exhibiting asymmetric and symmetric (V-shape) electro-optical characteristics. Mol Cryst Liq Cryst 364 491 99 Mogensen OE (1995) Positron annihilation in chemistry. Springer, Berlin Molsen H, Kitzerow HS (1994) Bistability in polymer-dispersed ferroelectric liquid crystals. J Appl Phys 75 710-716... [Pg.166]

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