Abstract
Using polarizing microscopy, we investigated the textural transformation and development of banded texture for cholesteric (nematic) liquid-crystalline solutions of poly(γ-benzyl glutamate) (PBG)s in an in-plane electric field. The threshold value for producing the uniform director orientation depends on cell thickness, d, and is inversely proportional to d1/2. In the solution aligned uniaxially by a dc field, the transient banded texture appears perpendicular to the field soon after inversion of the field direction. By using video-recording technique, detailed analysis of the texture can be performed and the following results are obtained: the appearance of banded texture is related to rotation of the director during realignment and two peaks of the optical intensity transmitted through the sample between crossed polarizers appear until the reorientation is completed; the band spacing remains constant during realignment and depends on the applied field strength; being a decreasing function of field strength. The effect of cholesteric twist on the kinetics of director rotation is studied for solutions of poly(γ-benzyl-L-glutamate) (PBLG), poly(γ-benzyl-D-glutamate) (PBDG) and racemic mixtures. A cholesteric twist was noted to affect kinetics of director rotation.
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Monzen, K., Hiraoka, K., Uematsu, Y. et al. Banded Texture Induced by an Electric Field in Polymeric Liquid Crystalline Solution. Polym J 30, 499–507 (1998). https://doi.org/10.1295/polymj.30.499
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DOI: https://doi.org/10.1295/polymj.30.499
