New Type of Chiral Photochromic Liquid Crystal Polymers for Colour Photo-Optical Recording

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Abstract
Photo-optical properties of a cholesteric copolymer based on nematogenic and photosensitive optical active lateral groups containing a benzeliden-p-mentan-3-on fragment have been investigated. The selective light reflection wavelength was found to be controlled by the UV irradiation that causes the photoisomerization of the chiral photochromic groups. As a result the selective reflection of light can be changed locally. That permits the recording of a color image on a color background. The copolymer's photo-optical properties are compared with properties of a blend of cholesterol-containing copolymer with a low-molar-mass chiral dopant based on menthone derivatives.