https://scholars.lib.ntu.edu.tw/handle/123456789/74444
Title: | PPV及PPP側接短鏈和液晶發光團之合成、結構和光電性質研究(2/3) | Authors: | 林金福 | Issue Date: | 2002 | Publisher: | 臺北市:國立臺灣大學材料科學與工程學研究所 | Abstract: | 本計畫第二年主要是合成㆒系列側接液晶短鏈(末端基分別為NO2, CN,及CF3) 的PPP 共軛高分子,探討其液晶相及發光性質。結果顯示以biphenyl tolane-based 的單體大部分具有寬廣範圍的液晶相,而部分聚合物在偏光顯微鏡鑑定㆘有nematic 相的存在。除了含NO2 取代基的高分子外,其餘聚 合體的主鏈和側鏈均有藕合現象,放射出400~450 nm 範圍的單㆒波峰螢光。聚合物在配向處理過polyimide 膜的配向實驗顯示,平行配向方向的螢光強度為垂直方向的4 倍,而側接的液晶分子則有平行排列於配向方向的現象。 In the second year of this project, a series of poly(p-phenylene) (PPP) derivatives were synthesized with each phenyl units attaching a short side chain composed of a flexible segment varying with lengths, a biphenyl tolane mesogenic moiety, and one of the following terminal groups: -NO2, -CN, and -CF3. The results indicate that most of the monomers with such arranged side chains exhibited a wide range of mesophases, but only part of their polymers possessed a nematic phase observed by a polarized optical microscope. Except those terminated with nitro groups, other polymers have theirπ- electrons in main chain and side chains coupled together and showed only one photoluminescence peak appeared in a wavelength range of 400 ~ 450 nm. When the polymers with side chains were aligned by casting the solutions to a rub-aligned polyimide films, their photoluminecent intensity in aligned direction was 4 times higher than that in transverse direction. IR analysis indicated that the attached mesogenic groups were preferentially oriented to the aligned direction. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/12403 | Other Identifiers: | 902216E002021 | Rights: | 國立臺灣大學材料科學與工程學研究所 |
Appears in Collections: | 材料科學與工程學系 |
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902216E002021.pdf | 347.76 kB | Adobe PDF | View/Open |
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