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Hierarchically self-constructed alignment layer of comb-shaped amphiphilic copolymers for spontaneous and stable vertical orientation of liquid crystals

Authors
Choi, Jin-WookKim, Sang HeeShin, Gyu JinKim, Jin-WookKim, Do HyunLee, Jun Hyup
Issue Date
Mar-2023
Publisher
ELSEVIER
Keywords
Alignment layer; Comb-shaped amphiphilic copolymer; Liquid crystal; Self-assembly; Vertical alignment
Citation
JOURNAL OF MOLECULAR LIQUIDS, v.373
Journal Title
JOURNAL OF MOLECULAR LIQUIDS
Volume
373
URI
http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/43329
DOI
10.1016/j.molliq.2023.121247
ISSN
0167-7322
Abstract
Hierarchically self-constructed ordered nanoarchitectures for precise control of molecular alignment has received much attention in a wide range of applications from optoelectronic devices to flexible biosen-sors. Herein, we present a facile and effective fabrication strategy to create a hierarchically constructed self-alignment layer of comb-shaped amphiphilic copolymers for spontaneous vertical molecular orien-tation of liquid crystals (LCs). Amphiphilic poly(vinyl 4-heptylbenzoate)-g-poly(vinyl alcohol) (PVHB-g- PVA) as a comb-shaped copolymer was doped to an LC medium, and its interfacial self-assembly on indium tin oxide electrode induced the hierarchical self-constructed alignment layer through hydrophilic interactions of hydroxy groups. In addition, hydrophobic and cooperative interactions of alkyl phenyl moieties in amphiphilic copolymers ensured the stable vertical self-alignment of LC molecules. Compared to conventional polyimide layer, the proposed self-constructed alignment layer afforded high vertical alignment ability for LCs and outstanding device performance in terms of the threshold voltage and response speed. Furthermore, the long-term alignment reliability of the proposed copolymeric self-assemblies was comparable to that of commercial alignment layer.(c) 2023 Elsevier B.V. All rights reserved.
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