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論文名稱 Title |
新型含苯并雙噻唑之二次非線性光學聚醯亞胺的合成與鑑定 Synthesis and Characterization of Novel Nonlinear Optical Polyimides Containing Benzobisthiazole-Derived Chromophore |
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系所名稱 Department |
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畢業學年期 Year, semester |
語文別 Language |
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學位類別 Degree |
頁數 Number of pages |
97 |
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研究生 Author |
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指導教授 Advisor |
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召集委員 Convenor |
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口試委員 Advisory Committee |
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口試日期 Date of Exam |
2007-01-15 |
繳交日期 Date of Submission |
2007-02-01 |
關鍵字 Keywords |
聚醯亞胺、非線性光學 benzobisthiazole, polyimide, nonlinear optical |
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統計 Statistics |
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中文摘要 |
本研究以變化苯并雙噻唑的剛硬性與共軛性為主,運用並擴展到 二次非線性光學的應用,合成出新型含苯并雙噻唑為主要結構之側鏈 發色團的非線性光學(NLO)聚醯亞胺。首先,利用雙胺酚塩與雙酐作 為起始單體以熱環化法合成出含有羥基的可溶型聚醯亞胺。NLO 發光 基團則由以DABDT 作為起始單體合成出含苯并雙噻唑為主要結構之 側鏈發色團的預聚物,再藉由Mitsunobu 反應形成醚基鍵結接到聚醯 亞胺主鏈上,最後於300oC 及真空條件下環化形成含苯并雙噻唑NLO 發色基團。在與發色團中導入雙鍵預期將可改善發色團的共軛性以增 加超極化率並增加側鏈柔韌性使側鏈在電壓極化下能更容易配向排 列。而由FTIR 與UV-vis 光譜分析,已確認苯并雙噻唑結構的形成。 由TGA分析結果顯示這些非線性光學聚醯亞胺具有約350oC的熱裂解 溫度。所測得的電光係數最高可達9.75(pm/V)。在160oC 的環境中經 過192 小時後仍可維持原電光係數78%的水準。 |
Abstract |
In this study, we extend the rigidity and resonance of benzobisthiazole for the application as second-order nonlinear optics. A novel nonlinear optical polyimide (NLO-PI) containing side-chained benzobisthiazole- based chromophore has been synthesized. A hydroxyl- containing PI (W2) was prepared using direct thermal imidization of 4,4'-diamino-4"- hydroxytriphenylmethane(DHTM) and 4,4’-(hexafluoroisopropylidene) diphthalic anhydride; the benzobisthiazole-based chromophore was then prepared using 2,5-diamino-1,4- benzenedithiol dihydrochloride as the starting monomer. The final NLO-PI was obtained by the Mitsunobu reaction via ether linkage between W2 and the chromophores. This ether linkage is expected to provide chain flexibility for better orientation under electric field during poling. The C=C bonds inside the chromophores also provide more orientation probabilities and conjugation length. Formation of benzobisthiazole-based chromophore and the corresponding NLO-PI was evidenced by FTIR and UV-vis spectra. TGA reveal a thermal decomposition temperature as high as 350oC, respectively. The electrooptic coefficient of the NLO-PI at a wavelength of 830nm was found to be r33=9.75 pm/V. |
目次 Table of Contents |
目錄 ii 圖目錄 v 表目錄 viiviii 中文摘要 iix Abstract x 壹、緒論 1 1-1前言 1 1-2 研究動機 2 貳、文獻回顧 3 2-1非線性光學簡介 3 2-2 非線性光學現象之原理 3 2-2-1 波克效應(Pockels effect) 4 2-2-2 波克效應之量測 5 2-3 非線性光學材料之介紹 6 2-3-1 有機非線性光學材料 6 2-3-2 有機非線性高分子 9 2-3-3 側鏈型有機非線性光學聚亞醯胺 13 |
參考文獻 References |
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