Influence of Dissolved Dye Molecules on Liquid Crystalline Side Chain Polymers

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Abstract
We report on the influence of dissolved dichroic dye molecules as well on the dye order parameter as on the clearing point of polymeric liquid crystalline host as a function of concentration. The investigations of several anthraquinone dyes in polyacrylic side chain polymers, using phenylebenzoate and biphenyle systems as mesogenic groups, show that the order parameter S (Dye) is constant over the concentration range under investigation for all systems. In all cases a decrease of the clearing point with increasing dye concentration could be observed. Also the influence of the dye structure, the spacer length and the mesogenic group are discussed.