Synthesis and characterization of novel polyimides containing stilbene unit in the side chain and their controllability of nematic liquid crystal alignment on the rubbed surfaces
SCIE
SCOPUS
- Title
- Synthesis and characterization of novel polyimides containing stilbene unit in the side chain and their controllability of nematic liquid crystal alignment on the rubbed surfaces
- Authors
- Park, JH; Jung, JC; Sohn, BH; Lee, SW; Ree, M
- Date Issued
- 2001-10-15
- Publisher
- JOHN WILEY & SONS INC
- Abstract
- Four polyimides containing hexylene spacer and a fluorostilbene unit in the side chains were prepared in thin-film form by two-step condensation of 3,3'-bis[(4'-fluoro-4-stilbenyl)oxyhexyloxy]-4,4'-biphenyldiamine (FS6B) with pyromellitic dianhydride (PMDA), benzophenone-3,3',4,4'-tetracarboxylic dianydride (BTDA), 4,4'-oxydi(phthalic anhydride) (ODPA), and 4,4'-hexafluoroisopropylidenedi(phthalic anhydride) (6FDA), respectively, and their controllability of liquid crystal (LC) alignment on rubbed surfaces was investigated. Pretilt angles of LCs were achieved in the 2-9 degrees range, depending on the rubbing density and backbone structures. The effect of the mesogenic stilbene group on the pretilting of LCs was distinctive in FS6B-PMDA. Contact-angle measurements on thin films annealed at 120 degreesC revealed that FS6B-PMDA potentially had the better alignment stability than FS6B-6FDA. (C) 2001 John Wiley & Sons, Inc.
- Keywords
- polyimides; stilbene; rubbing; pretilt angle; contact angle; MOLECULAR-ORIENTATION; PRETILT ANGLES; AROMATIC POLYIMIDES; POLYMER SURFACES; THIN-FILMS; STRENGTH; DISPLAYS; OPTICS; LAYERS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/19371
- DOI
- 10.1002/pola.10010
- ISSN
- 0887-624X
- Article Type
- Article
- Citation
- JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, vol. 39, no. 20, page. 3622 - 3632, 2001-10-15
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