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Nematic liquid crystals polymer alignment

Alternate irradiation with UV and blue light leading to the photoisomerization of azobenzene side chains attached to vinyl polymers induced the reversible switching of the alignment of nematic liquid crystals between homeotropic and... [Pg.42]

K. Ichimura, Y. Suzuki, T. Seki, Y. Kawanishi, T. Tamaki, and K. Aoki, Reversible alignment change of liquid crystals induced by photochromic molecular films, 2. Reversible alignment change of a nematic liquid crystal induced by pendent azobenzene groups-containing polymer thin films, Makromol. Chem., Rapid Commun. 10, 5-8 (1989). [Pg.63]

Y. Kawanishi, T. Tamaki, T. Seki, M. Sakuragi, and K. Ichimura, Alignment of nematic liquid crystals controlled by the photochromic reaction of aggregated surface azobenzenes, J. Phot-polym. Sci. Technol. 4, 271-278 (1991). [Pg.63]

Parfenov A, Tamaoki N, Ohnishi S. 2000. Photoinduced alignment of nematic liquid crystal on the polymer surface microrelief. J Appl Phys 87(4) 2043 2045. [Pg.172]

Gu, D., Jamieson, A. M., and Wang, S. Q., Rheological characterization of director tumbling induced in a flow-aligning nematic solvent by dissolution of a side-chain liquid crystal polymer, J. RheoL, 37, 985-1001 (1993). [Pg.83]

Kempe, M. D., and Kornfleld, J. A., Shear alignment behavior of nematic solutions induced by ultralong side-group liquid crystal polymers, Phys. Rev. Lett., 90, 115501 (2003). [Pg.84]

Fig. 6.9. The origin of liquid crystal alignment on rubbed polymer surfaces (A) Liquid crystal molecules have highly anisotropic charge distributions with their tt system preferentially oriented perpendicular to their long axis, which gives an ensemble of oriented (nematic) liquid crystals an asymmetric charge distribution (B). This can be characterized by molecular orientation factors (fa,fb,fc) describing the preferential orientation of the tt system. For the experimentally observed alignment directions the anisotropic charge distribution of the liquid crystal is oriented parallel to the one of the rubbed polyimide (C) and polystyrene (D) surface, which optimizes their interaction energy [3]. Fig. 6.9. The origin of liquid crystal alignment on rubbed polymer surfaces (A) Liquid crystal molecules have highly anisotropic charge distributions with their tt system preferentially oriented perpendicular to their long axis, which gives an ensemble of oriented (nematic) liquid crystals an asymmetric charge distribution (B). This can be characterized by molecular orientation factors (fa,fb,fc) describing the preferential orientation of the tt system. For the experimentally observed alignment directions the anisotropic charge distribution of the liquid crystal is oriented parallel to the one of the rubbed polyimide (C) and polystyrene (D) surface, which optimizes their interaction energy [3].
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