This study was completely carried out at the Chemical Resources Laboratory of the Tokyo Institute of Technology (T.I.T.). The authors are grateful for financial support in the form of a grant for “Harmonized Molecular Materials” from the New Energy and Industrial Technology Development Organization (NEDO). One of the authors (S.F.) thanks the Japan Society for the Promotion of Science (JSPS) for Research Fellowships for Young Scientists during his Ph.D. studies at T.I.T.
Photogeneration of High Pretilt Angles of Nematic Liquid Crystals by Non-Polarized Light Irradiation of Azobenzene-Containing Polymer Films†
Article first published online: 10 MAR 2004
Copyright © 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Functional Materials
Volume 14, Issue 3, pages 247–254, March, 2004
How to Cite
Furumi, S. and Ichimura, K. (2004), Photogeneration of High Pretilt Angles of Nematic Liquid Crystals by Non-Polarized Light Irradiation of Azobenzene-Containing Polymer Films. Adv. Funct. Mater., 14: 247–254. doi: 10.1002/adfm.200304484
- Issue published online: 10 MAR 2004
- Article first published online: 10 MAR 2004
- Manuscript Accepted: 28 OCT 2003
- Manuscript Received: 25 JUL 2003
- Liquid crystals, nematic;
A vertical-alignment (VA) cell of nematic liquid crystals (LCs) was prepared using photoirradiated thin films of a poly(methacrylate) with mesogenic moieties of 4-trifluoromethoxyazobenzene as the side chains. Optical anisotropy was generated by oblique irradiation of the azobenzene-containing polymer films with non-polarized UV light, followed by annealing treatment to enhance the photodichroism, which displayed thermal stability. The combination of oblique exposure to non-polarized UV light and subsequent annealing treatment brought about high pretilt angles of nematic LCs so that a photoaligned VA LC cell was fabricated. The photopatterned LC cell exhibited electro-optical properties with excellent optical quality when a voltage was applied even after heating at 100 °C for several hours.