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22 April 2008 Phase correlation function of liquid crystal-polymer composites
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Proceedings Volume 7008, Eighth International Conference on Correlation Optics; 700813 (2008)
Event: Eighth International Conference on Correlation Optics, 2007, Chernivsti, Ukraine
The methods of correlation optics are for the first time applied to study structure of liquid crystal (LC) - polymer (P) composites at various concentrations of LC and P. Their phase correlation function (PCF) was obtained considering LC-P composite as a random phase screen. The amplitude of PCF contains information about number of LC domains and structure of LC director inside of them, while a half-width of this function is connected with a size of these domains. We studied unpowered and powered composite layers with a thickness of 5 μm. As liquid crystal and polymer were used nematic LC E7 from Merck and photopolymer composition NOA65 from Norland. Concentration of polymer φP was varied in a range 10-55 vol. %. In good agreement with previous studies by SEM technique we detected monotone decrease of LC domains with concentration of polymer. With application of electric field, amplitude of PCF behaves differently for the samples with different polymer content. For the samples with φP >35 vol. % (samples having morphology of polymer dispersed LC), this dependence is monotonic. In turn, if φP <35 vol. % (samples with polymer network LC morphology), the amplitude of PCF non-monotonically depends on the applied voltage going through a maximum. The latter fact is explained by transformation of orientational defects of LC phase with the applied voltage.
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P. P. Maksymyak, A. L. Negrych, L. O. Dolgov, and O. V. Yaroshchuk "Phase correlation function of liquid crystal-polymer composites", Proc. SPIE 7008, Eighth International Conference on Correlation Optics, 700813 (22 April 2008);

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