| 학회 |
한국고분자학회 |
| 학술대회 |
2009년 가을 (10/08 ~ 10/09, 광주과학기술원 오룡관) |
| 권호 |
34권 2호 |
| 발표분야 |
액정/LCD 재료 |
| 제목 |
Unusual Alignment of Liquid Crystals on Rubbed Films of Polyimides with Fluorenyl Side Groups |
| 초록 |
We synthesized CBDA-FDA and its analogue, poly(4,4’-(9,9-fluorenyl)diphenylene pyromellitimide), and then investigated quantitatively the orientational distributions of the polymer chain segments in the surfaces of their films by using linearly polarized Fourier transform infrared (FTIR) spectroscopy and optical retardation analysis. We also examined the films’ surface topographies using high spatial resolution atomic force microscopy. Further, rubbed films were used to assemble antiparallel and 90°-twisted nematic LC cells, and the alignment behaviors, pretilt angles and anchoring energies of the LC molecules in the cells were determined. The films were found to have very interesting surface morphologies and LC alignment behaviors, which have not previously been reported. The observed LC alignments, pretilt angles and anchoring energies are discussed by taking into account the interactions of the LC molecules with the oriented polymer chain segments and the surface morphologies. |
| 저자 |
고용기, 함석규, 이택준, 장태현, 정진철, 진왕철, 진상우, 박삼대, 김진철, 김동민, 정정운, 노예철, 안병철, 권원상, 김경태, 김미희, 이문호
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| 소속 |
포항공과대 |
| 키워드 |
Polyimides containing fluorine moiety; Thin films; Rubbing process; Surface morphology; Microgrooves; Molecular orientation; Parallel liquid crystal alignment; Perpendicular liquid crystal alignment
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| E-Mail |
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