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2-Naphthoxymethyl-Substituted Polystyrenes for Homeotropic Liquid-Crystal Alignment Layers

✍ Scribed by Hyo Kang; Jin Seol Park; Daeseung Kang; Jong-Chan Lee

Publisher: John Wiley and Sons
Year: 2008
Tongue: English
Weight: 507 KB
Volume: 209
Category: Article
ISSN: 1022-1352
DOI: 10.1002/macp.200800257

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✦ Synopsis

Abstract

A series of 2‐naphthoxymethyl‐substituted polystyrenes (P2NAP) were prepared by the reaction of poly(chloromethylstyrene) with different amounts of 2‐naphthol to investigate the liquid‐crystal (LC) alignment properties of these polymer films. P2NAP with only 2‐naphthoxymethyl side groups (100% conversion of chloromethyl to 2‐naphthoxymethyl) was obtained when 180 mol‐% of naphthol was used in the reaction at 80 °C for 12 h. LC cells fabricated with unrubbed P2NAP films exhibited a homeotropic LC alignment behavior with a pretilt angle of approximately 90°. The homeotropic LC alignment behavior of the unrubbed LC cell of the P2NAP film was ascribed to the head‐on type incorporation of a nonpolar bulky 2‐naphthoxymethyl group into the phenyl side group of the polystyrene.

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4-Alkylphenoxymethyl-Substituted Polysty

4-Alkylphenoxymethyl-Substituted Polystyrenes for Liquid Crystal Alignment Layers

✍ Hyo Kang; Tae-Ho Kim; Daeseung Kang; Jong-Chan Lee 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 551 KB

## Abstract We synthesized a phenoxymethyl‐substituted polystyrene (PHP) and a series of 4‐alkylphenoxymethyl‐substituted polystyrenes, where the alkyl group is (CH~2~)~__n__~H (__n__ = 1, 2, 4, 6, and 8), using polymer analogous reactions, in order to study the effect of the phenoxymethyl and 4‐a