144 research outputs found
Guest-host electro-optic switching in spin-coated polymer ferroelectric liquid crystal film
No full textThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Shoji Okazaki, Sadahito Uto, Masanori Ozaki, Katsumi Yoshino, Kent Skarp, and Bertil Helgee, Appl. Phys. Lett. 71, 3373 (1997) and may be found at https://doi.org/10.1063/1.120399.We have proposed an electro-optic effect in dichroic-dye-doped polymer ferroelectric liquid crystal thin films prepared by a spin-coating technique. A high-quality homeotropically aligned film has been realized. Guest-host type electro-optic switching is confirmed in the dye-doped film, and basic properties such as electric field dependence of the response time are studied
Electro-optic switching in spin-coated ferroelectric mesomorphic polymer films and its analysis
No full textThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Sadahito Uto, Hiroshi Moritake, Masanori Ozaki, Kent Skarp, and Bertil Helgee, Journal of Applied Physics 79, 4444 (1996) and may be found at https://doi.org/10.1063/1.361754.Thin films of a chiral side‐chain polymer with a ferroelectric phase were deposited on a substrate by spin coating. Electro‐optic switching in the films were observed by applying an external field using in‐plane electrodes. Characteristics of the switching are presented, together with an analysis of the switching dynamics that takes into account the inhomogenous field distribution in the active area
Liquid crystal device and its manufacture
No full textThe invention relates to a liq. crystal device comprising a liq. crystal bulk layer and a dynamic surface-director alignment layer, wherein the liq. crystal bulk layer comprises a liq. cryst. material possessing a phase sequence consisting of isotropic phase, nematic phase and optionally cryst. phase (s), and the surface-director alignment layer comprises a chiral smectic liq. cryst. polysiloxane. The invention also relates to a method for its manufg
Functional beads of polyvinylpyrrolidone: promising support materials for solid-phase synthesis
No full text3-But-3-enyl-1-vinylpyrrolidin-2-one, 3,3-dibut-3-enyl-1-vinylpyrrolidin-2-one, 3-undec-10-enyl-1-vinylpyrrolidin-2-one, and 3,3-diundec-10-enyl-1-vinylpyrrolidin-2-one were prepd. and suspension polymd. to prep. hydrophilic polymer beads. Undec-10-en-1-ol was used as a comonomer for the introduction of functional groups. The lightly crosslinked beads contained hydroxyl groups at functional loading 0.28 mmol/g and swelled extensively in a broad range of solvents. [on SciFinder (R)
A liquid crystal device and a method for manufacturing thereof
No full textThe invention relates to a liq. crystal device comprising a liq. crystal bulk layer and a dynamic surface-director alignment layer, wherein the liq. crystal bulk layer comprises a liq. cryst. material possessing a phase sequence consisting of isotropic phase, nematic phase and optionally cryst. phase (s), and the surface-director alignment layer comprises a chiral smectic liq. cryst. polysiloxane. The invention also relates to a method for its manufg. [on SciFinder (R)]
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74 FIELD Section Title:Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes
Field url:
Ae, ag, al, am, at, au, az, ba, bb, bg, br, bw, by, bz, ca, ch, cn, co, cr, cu, cz, de, dk, dm, dz, ec, ee, eg, es, fi, gb, gd, ge, gh, gm, hr, hu, id, il, in, is, jp, ke, kg, km, kp, kr, kz, lc, lk, lr, ls, lt, lu, lv, ma, md, mg, mk, mn, mw, mx, mz, na, ng, ni, no, nz, om, pg, ph, pl, pt, ro, ru, sc, sd, se, sg, sk, sl, sm, sy, tj, tm, tn, tr, tt, tz, ua, ug, us, uz, vc, vn, yu, za, zm, zw.
At, be, ch, cy, de, dk, es, fi, fr, gb, gr, ie, is, it, lu, mc, nl, pt, se, tr, bf, bj, cf, cg, ci, cm, ga, ml, mr, ne, sn, td, tg.
G02f001-1347.
G02f001-1337; g02f001-141; c09k019-40.
Application: WO
20050608.
2005-ep6145
Ep
2004-13592
20040609 FIELD Citations:Demus, D; WO 0003288 A 2000|Galli, G; MOLECULAR CRYSTALS AND LIQUID CRYSTALS 2001, 360, 147|Komitov, L; WO 03081326 A 2003|Komitov, L; JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY SOC, 11, 437|Merck Patent Gmbh; WO 8909203 A 198
Polymers for use as alignment layers in liquid crystal devices
No full textThe invention relates to a polymer for use as a surface-director alignment layer in a liq. crystal device, said polymer comprising a polymeric backbone and side-chains attached thereto, wherein the polymeric backbone lacks directly coupled ring structures, and each side-chain of at least some of the side-chains comprises >=2 unsubstituted and/or substituted phenyls coupled via a coupling selected from a carbon-carbon single bond, a carbon-carbon double bond contg. unit (CH:CH), a carbon-carbon triple bond contg. unit (C.tplbond.C), a methylene eter unit (CH2O) , an ethylene eter unit (CH2CH2O), an ester unit (COO) and an azo unit (N:N), exhibits a permanent and/or induced dipole moment that in ordered phase provides dielec. anisotropy, and is attached to the polymeric backbone via at least two spacing atoms. Thus, 4\u27-(11,11-diethoxyundecyloxy)biphenyl-4-carbonitrile 0.70, octanal 0.081, and polyvinyl alc. 0.198 g were reacted in DMF at 55 Deg for 24 h to give a side-chain liq. crystal polymer, which was fabricated into a liq. crystal device as alignment layer. [on SciFinder (R)
Polymers for use as alignment layers in liquid crystal devices
No full textThe invention relates to a polymer for use as a surface-director alignment layer in a liq. crystal device, said polymer comprising a polymeric backbone and side-chains attached thereto, wherein the polymeric backbone lacks directly coupled ring structures, and each side-chain of at least some of the side-chains comprises >=2 unsubstituted and/or substituted phenyls coupled via a coupling selected from a carbon-carbon single bond, a carbon-carbon double bond contg. unit (CH:CH), a carbon-carbon triple bond contg. unit (C.tplbond.C), a methylene eter unit (CH2O) , an ethylene eter unit (CH2CH2O), an ester unit (COO) and an azo unit (N:N), exhibits a permanent and/or induced dipole moment that in ordered phase provides dielec. anisotropy, and is attached to the polymeric backbone via at least two spacing atoms. Thus, 4'-(11,11-diethoxyundecyloxy)biphenyl-4-carbonitrile 0.70, octanal 0.081, and polyvinyl alc. 0.198 g were reacted in DMF at 55 Deg for 24 h to give a side-chain liq. crystal polymer, which was fabricated into a liq. crystal device as alignment layer. [on SciFinder (R)
A liquid crystal device and a method for manufacturing thereof
No full textThe invention relates to a liq. crystal device comprising a liq. crystal bulk layer and a dynamic surface-director alignment layer, wherein the liq. crystal bulk layer comprises a liq. cryst. material possessing a phase sequence consisting of isotropic phase, nematic phase and optionally cryst. phase (s), and the surface-director alignment layer comprises a chiral smectic liq. cryst. polysiloxane. The invention also relates to a method for its manufg. [on SciFinder (R)]74 FIELD Section Title:Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic ProcessesField url:Ae, ag, al, am, at, au, az, ba, bb, bg, br, bw, by, bz, ca, ch, cn, co, cr, cu, cz, de, dk, dm, dz, ec, ee, eg, es, fi, gb, gd, ge, gh, gm, hr, hu, id, il, in, is, jp, ke, kg, km, kp, kr, kz, lc, lk, lr, ls, lt, lu, lv, ma, md, mg, mk, mn, mw, mx, mz, na, ng, ni, no, nz, om, pg, ph, pl, pt, ro, ru, sc, sd, se, sg, sk, sl, sm, sy, tj, tm, tn, tr, tt, tz, ua, ug, us, uz, vc, vn, yu, za, zm, zw.At, be, ch, cy, de, dk, es, fi, fr, gb, gr, ie, is, it, lu, mc, nl, pt, se, tr, bf, bj, cf, cg, ci, cm, ga, ml, mr, ne, sn, td, tg.G02f001-1347.G02f001-1337; g02f001-141; c09k019-40.Application: WO20050608.2005-ep6145Ep2004-1359220040609 FIELD Citations:Demus, D; WO 0003288 A 2000|Galli, G; MOLECULAR CRYSTALS AND LIQUID CRYSTALS 2001, 360, 147|Komitov, L; WO 03081326 A 2003|Komitov, L; JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY SOC, 11, 437|Merck Patent Gmbh; WO 8909203 A 198
Polymers for use as alignment layers in liquid crystal devices
No full textThe invention relates to a polymer for use as a surface-director alignment layer in a liq. crystal device, said polymer comprising a polymeric backbone and side-chains attached thereto, wherein the polymeric backbone lacks directly coupled ring structures, and each side-chain of at least some of the side-chains comprises >=2 unsubstituted and/or substituted phenyls coupled via a coupling selected from a carbon-carbon single bond, a carbon-carbon double bond contg. unit (CH:CH), a carbon-carbon triple bond contg. unit (C==C), a methylene eter unit (CH2O) , an ethylene eter unit (CH2CH2O), an ester unit (COO) and an azo unit (N:N), exhibits a permanent and/or induced dipole moment that in ordered phase provides dielec. anisotropy, and is attached to the polymeric backbone via at least two spacing atoms. Thus, 4'-(11,11-diethoxyundecyloxy)biphenyl-4-carbonitrile 0.70, octanal 0.081, and polyvinyl alc. 0.198 g were reacted in DMF at 55 Deg for 24 h to give a side-chain liq. crystal polymer, which was fabricated into a liq. crystal device as alignment layer
Necessary conditions for display and fast switching of high contrast images by antiferroelectric liquid crystal displays
No full textAntiferroelectric liquid crystals (AFLC) with 45° molecular tilt were stated to be the solution of the dark state problem in AFLC displays (AFLCDs). However, AFLCs that are available at present actually possess antiferroelectric (AF) to ferroelectric (F) transition of first order characterized by slow switching times which in turn deteriorates the dark state in AFLCDs. Here, we report on the switching behavior of a siloxane AFLC dimer with molecular tilt close to 45°. This material exhibits AF to F transition of second order at lower temperatures, something that enables display and fast switching of high contrast images in AFLCDs. ©2006 American Institute of Physic
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