2-naphthoxymethyl-substituted Polystyrenes for homeotropic liquid-crystal alignment layers
- Authors
- Kang, Hyo; Park, Jin Seol; Kang, Daeseung; Lee, Jong-Chan
- Issue Date
- 22-Sep-2008
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- alignment; homeotropic; liquid crystals; polystyrene (PS); rubbing
- Citation
- MACROMOLECULAR CHEMISTRY AND PHYSICS, v.209, no.18, pp.1900 - 1908
- Journal Title
- MACROMOLECULAR CHEMISTRY AND PHYSICS
- Volume
- 209
- Number
- 18
- Start Page
- 1900
- End Page
- 1908
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/16802
- DOI
- 10.1002/macp.200800257
- ISSN
- 1022-1352
- 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 degrees C for 12 h. LC cells fabricated with unrubbed P2NAP films exhibited a homeotropic LC alignment behavior with a pre-title angle of approximately 90 degrees. 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-naphthoxy-methyl group into the phenyl side group of the polystyrene.
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