Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1990-06-25
1992-08-11
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
528 21, 528 23, 528 25, 528 27, 528 31, 556436, 25229901, 25229961, C08G 7704
Patent
active
051380102
ABSTRACT:
New ferroelectric liquid crystal (FLC) materials comprising linear and cyclic polysiloxanes are described. The FLCs exhibit high polarization and fast switching speeds. The disclosed polysiloxanes are derivitized with mesogenic groups which induce high polarization, specifically chiral nonracemic epoxide mesogens, having phenylbenzoate, reverse phenylbenzoate and biphenyl cores. These epoxy polysiloxanes are chemically stable over extended periods. Further, the epoxides can be crosslinked to produce FLC elastomers and like materials having optoelectronic applications. It was found that in the pure polysiloxanes, the smectic layers align along the rubbing direction of an anisotropic surface on contact with that surface. An unexpected alignment transition is observed as a function of polysiloxane concentration in polysiloxane/LC monomer mixtures with smectic layers orienting along the rubbing direction at high polymer concentrations and, typical of low molecular weight liquid crystals, normal to the rubbing direction at low polymer concentrations. A method for alignment of FLC polysiloxanes is described. The aligned polysiloxane FLCs and FLC mixtures exhibit high contrast electro optic switching.
REFERENCES:
patent: 4367924 (1983-01-01), Clarke et al.
patent: 4561726 (1985-12-01), Goodby et al.
patent: 4563059 (1986-01-01), Clarke et al.
patent: 4638073 (1987-01-01), Walba et al.
patent: 4639089 (1987-01-01), Okada et al.
patent: 4705874 (1987-11-01), Walba et al.
patent: 4763995 (1988-08-01), Katagiri et al.
Keller, P. (1988) Mol. Cryst. Liq. Cryst. 157:193-202.
Keller, P. (1990) Chem. of Materials 2:3-4.
Sato, K. et al. (1988) Makromol. Chem. Rapid Commun. 9:631-636.
Richard, H. et al. (1988) Mol. Cryst. Liq. Cryst. 155:141-150.
Mauzac, M. et al. (1986) Eur. Polym. J. 22:137.
Krone, V. and Ringsdorf, H. (1987) Liquid Crystals 2:411-422.
Hahn, B. and Percec, V. (1987) Macromolecules 20:2961.
Hahn, B. and Percec, B. (1988) Mol. Crystl. Liq. Cryst. 157:1252.
Shibaev, V. P. et al. (1984) Polym. Bull. 12:299-301.
Shivaev, V. P. et al. (XXXX) 30th IUPAC Macromol. Symp. (Abstract) p. 528.
Decobert, G. et al. (1985) Polym. Bull. 14:179.
Decobert, G. et al. (1986) Polym. Bull. 14:549.
Decobert, G. et al. (1987) Liquid Crystals 1:307.
Esselin, S. et al. (1987) Liquid Crystals 2:505.
Dubois, J. C. (1986) Mol. Crystl. Liq. Cryst. 137:349-364.
Uchida, S. et al. (1988) Mol. Cryst. Liq. Cryst. 155:93-102.
Bualek, S. et al. (1988) Mol. Cryst. Liq. Cryst. 155:47-56.
Keller, P. (1988) Ferroelectrics 85:425-434.
Suzuki, T. et al. (1988) Makromol. Chem. Rapid Commun. 9:755.
Scherowdky, G. et al. (1989) Liquid Crystals 5:1281.
Crivello, J. V. and Lee, J. L. (1989) Chem. of Materials 1:445-451.
Keller Patrick J.
Walba David M.
Marquis Melvyn I.
University of Colorado Foundation Inc.
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