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Polymers 2018, 10(2), 201;

Renewable, Eugenol—Modified Polystyrene Layer for Liquid Crystal Orientation

Department of Chemical Engineering, Dong-A University, 37 Nakdong-Daero 550beon-gil, Saha-gu, Busan 604-714, Korea
The authors contributed equally to this work.
Author to whom correspondence should be addressed.
Received: 14 December 2017 / Revised: 24 January 2018 / Accepted: 13 February 2018 / Published: 17 February 2018
(This article belongs to the Special Issue Polymers from Renewable Resources)
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We synthesized a series of plant-based and renewable, eugenol-modified polystyrene (PEUG#) (# = 20, 40, 60, 80, and 100, in which # is the molar content of the eugenol moiety in the side group). Eugenol is extracted from clove oil. We used polymer modification reactions to determine the liquid crystal (LC) orientation properties of the polymer films. In general, the LC cells fabricated using the polymer films with a higher molar content of eugenol side groups exhibited vertical LC orientation behavior. The vertical orientation behavior was well correlated with the surface energy value of the polymer films. The vertical LC orientation could be formed due to the low polar surface energy value on the polymer film generated by the nonpolar carbon group. Electro-optical performances (e.g., voltage holding ratio (VHR), residual DC voltage (R-DC), and thermal orientation stabilities) were good enough to be observed for LC cells using PEUG100 polymer as an eco-friendly LC orientation material. View Full-Text
Keywords: liquid crystal; orientation; polystyrene; eugenol liquid crystal; orientation; polystyrene; eugenol

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ju, C.; Kim, T.; Kang, H. Renewable, Eugenol—Modified Polystyrene Layer for Liquid Crystal Orientation. Polymers 2018, 10, 201.

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