C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 19/38 (2006.01) C08J 3/28 (2006.01) G02F 1/141 (2006.01) G02F 1/137 (2006.01)
Patent
CA 2330894
The invention is a technique that uses reactive diacrylate monomers carrying azobenzene groups to accomplish both the induction and the stabilization of a long-range, uniaxial molecular orientation of ferroelectric liquid crystals (FLCs) in the absence of rubbed surfaces. The process consists in dissolving 5-10 wt% of an azobenzene diacrylate monomer in a FLC host, and polymerizing the monomer while irradiating the mixture with linearly polarized light. The mechanism involves the formation of an optically induced anisotropic azobenzene polymer network that, in turn, induces and locks in the FLC orientation. Both thermal and photopolymerization can be used. In the former case, the polymerization can be carried out in either the isotropic or the nematic phase of the FLC host; while in the latter case, it can be proceeded in all phases. The irradiation is generally turned off after polymerization, but if the polymerization is performed in the isotropic phase, it should be turned off after cooling the sample into one of the liquid crystalline phases of the FLC host. The stabilization of the aligned chiral smectic-C phase is characterized by the recoverable long-range molecular orientation when cooled from the isotropic phase.
Paiement Nadine
Zhao Yue
Goudreau Gage Dubuc
Paiement Nadine
Universite de Sherbrooke
Zhao Yue
LandOfFree
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