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Proceedings Paper

Phase separation in liquid crystal polymer composites
Author(s): E. Grosicka; Maria Mucha
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Paper 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.

Paper Details

Date Published: 12 May 2000
PDF: 6 pages
Proc. SPIE 4147, Liquid Crystals: Chemistry, Physics, and Applications, (12 May 2000); doi: 10.1117/12.385716
Show Author Affiliations
E. Grosicka, Technical Univ. of Lodz (Poland)
Maria Mucha, Technical Univ. of Lodz (Poland)


Published in SPIE Proceedings Vol. 4147:
Liquid Crystals: Chemistry, Physics, and Applications
Stanislaw J. Klosowicz; Jolanta Rutkowska; Jerzy Zielinski; Jozef Zmija, Editor(s)

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