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12 May 2000 Phase separation in liquid crystal polymer composites
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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 Tg and TNI of LC changing in the course of matrix polymerization were found.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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