| 학회 |
한국고분자학회 |
| 학술대회 |
2003년 봄 (04/11 ~ 04/12, 연세대학교) |
| 권호 |
28권 1호, p.93 |
| 발표분야 |
분자전자 부문위원회 |
| 제목 |
Synthesis, Liquid-Crystalline Behavior and Anisotropic Electro-optic Properties of Fluorene Oligomers |
| 초록 |
A series of well-defined monodispersed fluorene oligomers up to heptamer were synthesized based on repetitive Suzuki and Yamamoto coupling reactions. Optical properties for these fluorine oligomers were characterized using UV/Vis absorption and photoluminescence spectroscopy both in solutions and films. The limiting conjugation length for the poly(9,9-bis(2-ethylhexyl)fluorine-2,7-diyl) was estimated to be 14 from absorption spectra of the oligomers. Glass transition and liquid crystalline behavior of the oligomers were also investigated under polarized optical microscope and differential scanning calorimetry (DSC). In case of oligomers with 2-ethylhexyl as a branch, thermotropic nematic phase was observed starting from the tetramer. The monodomain glassy nematic thin films of the oligomers were prepared by employing rubbed alignment layers and the anisotropies of their electro-optic.properties were investigated as function of the chain length |
| 저자 |
조정호;Chunyan Chi ;임찬;S. Hoeger ;G. Wegner ;윤도영 |
| 소속 |
서울대 |
| 키워드 |
fluorene oligomer; liquid crystal; anisotropic
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| E-Mail |
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