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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received August 8, 2007
Accepted September 12, 2007

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Temperature stability of electro-optic properties of polymer dispersed liquid crystal with different crosslinking monomer in PN393 base pre-polymer

Young-Seok No Jae Hong Kim Chan-Wook Jeon^† Si-Hyun Park¹

School of Display and Chemical Engineering, Yeungnam University, Gyeongsan 712-749, Korea ¹Department of Photonic Engineering, Chosun University, Gwangju 501-759, Korea

Korean Journal of Chemical Engineering, January 2008, 25(1), 181-184(4), 10.1007/s11814-008-0033-2

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Abstract

The electro-optic properties of polymer-dispersed liquid crystals (PDLCs) fabricated by photo-induced phase separation have been investigated. A mixture of TL205 (80 wt%) liquid crystal and PN393 (20 wt%) pre-polymer having different crosslinking monomers was used for producing various PDLCs to compare its temperature stability. As a reference, a commercialized PN393 formulation was closely examined to compare the effects of replacing the crosslinker. The liquid crystal domain size varied from 3.5mm to 10.3 μm depending on the crosslinker used. The larger domain size of PDLCs consisting of vinyl ether shows higher contrast ratio but faster response time and higher turnon voltage, which is contrary to the prediction. Acrylate-based PDLCs were found to be turned on, although abruptly increasing below 20 ℃, and also showed heavy variation of other electro-optic over a wide operation temperature range. By substituting a vinyl-ether for the acrylate crosslinker, the temperature behavior was greatly improved.

Keywords

PDLC Crosslinker PN393 TMPTA DEGDVE

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