Phase separation in liquid crystal polymer composites

E. Grosicka; Maria Mucha

doi:10.1117/12.385716

12 May 2000 Phase separation in liquid crystal polymer composites

E. Grosicka, Maria Mucha

Proceedings Volume 4147, Liquid Crystals: Chemistry, Physics, and Applications; (2000) https://doi.org/10.1117/12.385716
Event: XIII International Conference on Liquid Crystals: Chemistry, Physics, and Applications, 1999, Krynica Zdroj, Poland

Abstract

The aim of this study is presentation of thermodynamic analysis of polymerization induced phase separation for a previously investigated (8 - 11) PDLC consisting of nematic LC mixture (W-52a and 6CB) dissolved in unsaturated oligoester resin. That is polymerized by UV radiation to form photosetting polymer matrix. The analysis of the separation is focused on polarized optical microscopy determination of cloud-point. The separation temperature is dependent on weight fraction of LC in the blend with oligoester. The value (for the same weight fraction) depends strongly on polymer conversion. Flory-Huggins interaction parameter (chi) (calculated from spinodal equation) is dependent on temperature according to equation: (chi) _(T) equals C_(p) + D_(p)/T; where C_(p) and D_(p) depend on a conversion degree of the polymer. Additionally T_g and T_NI of LC changing in the course of matrix polymerization were found.

Citation Download Citation

E. Grosicka and Maria Mucha "Phase separation in liquid crystal polymer composites", Proc. SPIE 4147, Liquid Crystals: Chemistry, Physics, and Applications, (12 May 2000); https://doi.org/10.1117/12.385716

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