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Proceedings Paper

Morphological Control In Polymer-Dispersed Liquid Crystal Film Matrices
Author(s): Frederick G. Yamagishi; Leroy J. Miller; Camille I. van Ast
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Paper Abstract

Polymer-dispersed liquid crystal (PDLC) films are derived from the polymerization of solutions of liquid crystals (LCs) in monomers. Upon polymerization:a phase separation occurs causing the liquid crystal to separate into discrete droplets. The liquid crystal material within these droplets still retains the electro-optic properties of bulk material. We describe the preparation of PDLC films in which the polymer is derived from a number of photopolymerizable acrylate-based monomers and the liquid crystal is a commercially available mixture with a positive dielectric anisotropy. It was found that the morphology of the resulting PDLC film can be controlled by the composition and concentration of the monomer/liquid crystal solution, the type of photoinitiator, and the rate of polymerization. Two distinct morphologies were observed: (1) A "polymer ball" morphology, in which the liquid crystal droplets were large and irregularly shaped, and (2) a "Swiss cheese" morphology, in which the liquid crystal droplets were small and nearly spherical. Modification of the polymerization mechanism from a chain polymerization to a stepwise polymerization had a dramatic effect on the resulting morphology.

Paper Details

Date Published: 25 July 1989
PDF: 8 pages
Proc. SPIE 1080, Liquid Crystal Chemistry, Physics, and Applications, (25 July 1989); doi: 10.1117/12.976397
Show Author Affiliations
Frederick G. Yamagishi, Hughes Research Laboratories (United States)
Leroy J. Miller, Hughes Research Laboratories (United States)
Camille I. van Ast, Hughes Research Laboratories (United States)

Published in SPIE Proceedings Vol. 1080:
Liquid Crystal Chemistry, Physics, and Applications
J. William Doane; Zvi Yaniv, Editor(s)

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