Synthesis and characterization of novel polyimides bearing a side chain composed of stilbene mesogen and undecyl spacer and the alignment ability of nematic liquid-crystal molecules
- Authors
- Park, Ju Hyun; Sohn, Byeong Hyeok; Jung, Jin Chul; Lee, Seung Woo; Ree, Moonhor
- Issue Date
- May-2001
- Publisher
- JOHN WILEY & SONS INC
- Keywords
- polyimide; stilbene; rubbing; undecyl spacer; pretilt angle
- Citation
- JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, v.39, no.10, pp 1800 - 1809
- Pages
- 10
- Journal Title
- JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
- Volume
- 39
- Number
- 10
- Start Page
- 1800
- End Page
- 1809
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/38972
- DOI
- 10.1002/pola.1157
- ISSN
- 0887-624X
1099-0518
- Abstract
- Four different polyimides with side chains containing undecyl spacers and 4-fluorostilbene mesogen end groups were prepared, and their structures and the controllability of the liquid-crystal (LC) alignment with rubbing were investigated. From X-ray scattering and differential scanning calorimetry data, pyromellitic dianhydride (PMDA)-, benzophenone-3,3 ' ,4,4 ' -tetracarboxylic dianhydride (BTDA)-, and 4,4 ' -oxydi(phthalic anhydride) (ODPA)-based polyimides were shown to have layered structures and short-range ordering. Pretilt angles of LCs on the rubbed surfaces were 1-9 degrees, depending on the rubbing density and backbone. In particular, the long undecyl spacers caused the mesogenic stilbene end groups to lie next to the main chain, resulting in a reduction in the pretilt angles. (C) 2001 John Wiley & Sons, Inc.
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Collections - College of Engineering > School of Chemical Engineering and Material Science > 1. Journal Articles
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