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Proceedings Paper

Characterization of the phase separation of the E7 liquid crystal component mixtures in a thiol-ene-based polymer
Author(s): Joe B. Whitehead Jr.; Nicole L. Gill; Casie Adams
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Paper Abstract

We have investigated the single components and binary component mixtures of the liquid crystal E7 in NOA65 and UV1 thiol-ene pre-polymers. E7 is composed of K15 (4-pentyl-4'- cyanobiphenyl), K21 (4-heptyl-4'-cyanobiphenyl), M24 (4- octyloxy-4'-cyanobiphenyl), and T15 (4-pentyl-4'- cyanoterphenyl). The single liquid crystal components and binary liquid crystal mixtures that were investigated include K15, K21, K15-K21, K15-M24, and K21-M24. The liquid crystal/pre-polymer phase diagrams were developed using thermally induced phase separation to determine the temperature of phase separation. Then, PDLC samples were prepared using photo-polymerization induced phase separation, and were polymerized at varying increments above the liquid crystal/pre-polymer phase separation temperature to determine how the morphology changes with the polymerization temperature, the liquid crystal component, and liquid crystal percentage. Polarized optical microscopy was used to determine the phase separation temperatures for the liquid crystal/pre- polymer samples and the nematic-to-isotropic transition temperatures for the PDLC samples. Laser light transmission measurements were performed to determine the electro-optic properties of the PDLC samples.

Paper Details

Date Published: 24 October 2000
PDF: 9 pages
Proc. SPIE 4107, Liquid Crystals IV, (24 October 2000); doi: 10.1117/12.405323
Show Author Affiliations
Joe B. Whitehead Jr., Univ. of Southern Mississippi (United States)
Nicole L. Gill, Univ. of Southern Mississippi (United States)
Casie Adams, Picayune High School (United States)

Published in SPIE Proceedings Vol. 4107:
Liquid Crystals IV
Iam-Choon Khoo, Editor(s)

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