Hierarchically self-constructed alignment layer of comb-shaped amphiphilic copolymers for spontaneous and stable vertical orientation of liquid crystals
- Authors
- Choi, Jin-Wook; Kim, Sang Hee; Shin, Gyu Jin; Kim, Jin-Wook; Kim, Do Hyun; Lee, 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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