Template-assisted interfacial self-assembly of amphiphilic poly(ethylene oxide)-poly(propylene oxide)-based triblock copolymers for automatic control of molecular alignment
- Authors
- Choi, Jin-Wook; An, Jongil; Son, Seung-Rak; Kim, Soyern; Park, Jisung; Park, Chan Beom; Lee, Jun Hyup
- Issue Date
- 1-Dec-2021
- Publisher
- ELSEVIER
- Keywords
- Amphiphilic triblock copolymer; Interfacial self-assembly; Liquid crystal; Molecular alignment; Polymer nanolayer
- Citation
- JOURNAL OF MOLECULAR LIQUIDS, v.343
- Journal Title
- JOURNAL OF MOLECULAR LIQUIDS
- Volume
- 343
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/41308
- DOI
- 10.1016/j.molliq.2021.117593
- ISSN
- 0167-7322
- Abstract
- Hierarchical self-assembled nanoarchitectures based on peculiar self-assembly of block copolymers are advantageous for the nanofabrication of functionally versatile materials with a wide range of potential applications from bioelectronic devices to flexible displays. Herein, we developed a simple yet efficient, cost-effective, scalable strategy for the fabrication of an ultrafast responsive and highly reliable self-constructed polymer nanolayer for automatic control of molecular alignment by using the template-assisted interfacial self-assembly of amphiphilic poly(ethylene oxide)-poly(propylene oxide)-based triblock copolymers. A new type of ultrathin polymer nanolayer was facilely fabricated on polar electrode surface using simple doping in liquid crystal (LC) medium and in situ interfacial self-assembly of a small amount of amphiphilic triblock copolymers in the closed LC cell. A hydrophobic and ultrathin polymer nanolayer with dense nanoneedle arrays formed by interfacial hydrogen bonding between hydrophilic poly(ethylene oxide) block and hydrophilic indium tin oxide electrode induces a spontaneous homeotropic alignment of LCs during programmed self-assembly process. Moreover, this facile approach endows the polymer nanolayer with ultrafast electro-optical switching and high molecular alignment force characteristics, as well as an excellent alignment stability during long-term operation. Compared to commercial polyimide layer, our polymer nanolayer accomplishes the ultrafast falling response time with an improvement of 55.3% and fast rising response time with a reduction of 36.4%. (C) 2021 Elsevier B.V. All rights reserved.
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