| 研究生: |
楊博智 Yang, Po-Chih |
|---|---|
| 論文名稱: |
含硝基偶氮苯衍生基光敏性液晶高分子之合成及特性探討 Synthesis and Characterization of Photosensitive Liquid Crystal Polymers Having Nitro-azobenzene Derivatives |
| 指導教授: |
劉瑞祥
Liu, Jui-Hsiang |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
| 論文出版年: | 2003 |
| 畢業學年度: | 91 |
| 語文別: | 中文 |
| 論文頁數: | 179 |
| 中文關鍵詞: | 偶氮苯 、液晶 |
| 外文關鍵詞: | photoisomerization |
| 相關次數: | 點閱:44 下載:3 |
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本實驗合成數種不同官能基、不同碳鏈長度的液晶單體4-hexyloxyphenyl-4’-(6-acryloyloxyalkyloxy)benzoate、4-nitrophenyl-4’-
(6-acryloyloxyalkyloxy)benzoate、不同碳鏈長度的偶氮苯單體6-〔4-(4-nitrophenyl)diazenylphenyloxy〕alkyl acrylate及小分子偶氮苯化合物(4-alkyloxy-phenyl)-(4- nitro -phenyl)-diazene,再利用自由基聚合法聚合出在相同進料比條件下,不同碳鏈長度及不同官能基的共聚合物,這些高分子為非結晶形高分子或液晶高分子。所合成之化合物均使用IR、NMR、EA、UV、TGA、DSC、GPC、X-ray等儀器來加以鑑定與分析。本實驗合成的單體與高分子經偏光顯微鏡分析可定性為Nematic、Smectic A及Sc*液晶,液晶高分子的結構更利用X-ray繞射來驗證其種類。在起始劑3 mol% 條件下,所合成高分子之重量平均分子量為10000~30000,分子量分佈在1.2~1.7,聚合物之5wt%損失熱重損失均可達高達340℃以上。含有硝基偶氮苯衍生基之側鏈液晶高分子,在溶液狀態時照射紫外光365nm,偶氮苯基團會立即發生光化學異構化反應,使得溶液之吸收度λmax下降,若照射可見光或使用熱回復方式可恢復至原來吸收度狀態,液晶高分子可利用此光化學異構化反應前後分子的物性差異,將其應用在光記憶型材料與影像儲存材料等領域。
本實驗亦將液晶E48與光學活性摻混物S811混合均勻,製作成膽固醇液晶薄膜,可調配出在可見光區域有選擇光散射的光學薄膜,再加入偶氮苯化合物於上述組成中,來探討溫度效應與照射紫外光,對整體選擇性光散射波長(λ)移轉之影響。可藉由照射紫外光與可見光之間的轉換,而得到不同選擇性光散射波長。在固定波長下,光學薄膜穿透度對紫外光照射下之可逆性變化,文中亦有詳細探討。
A series of monomeric azobenzene derivatives of 4-hexyloxyphenyl-4’-(6-acryloyloxyalkyloxy)benzoate, 4-nitrophenyl-4’- (6-acryloyloxyalkyloxy)benzoate, 6-〔4-(4-nitrophenyl)diazenylphenyloxy〕 alkyl acrylate with various spacer lengths, and a low molecular weight of (4-alkyloxyphenyl)-(4-nitrophenyl)-diazene were synthesized. Polymerization of monomers was carried out under various conditions. Liquid crystalline polymers and amorphous polymers were obtained. Compounds synthesized in this investigation are confirmed by using FTIR, NMR, UV, TGA, DSC, and EA analyzer. The textures of Nematic and Smectic liquid crystalline monomers and polymers were confirmed by crossed polarized microscope. The structures of liquid crystalline polymers were further confirmed by X-ray diffraction analyzer. Molecular weights of obtained polymers are between 10000 and 30000. Thermal stability of polymers was evaluated by DSC technique. Thermal degradation of 5% weight loss of liquid crystalline polymers was found to be higher than 340oC.
Liquid crystalline polymers having nitro-azobenzene groups undergo photo-isomerization from trans to cis under UV light irradiation, while visible light and heat treatment can return it from cis to trans. Optical behaviors of azoderivatives synthesized in this investigation were all investigated. Cholesteric liquid crystal films were fabricated by using commercial available E48, S811, and synthesized azobenzene derivatives. Reflecting wavelength, light transmittance, and reliability of Cholesteric liquid crystal films were also investigated in detail.
1. 松本正一、角田市良合著,劉瑞祥譯,“液晶之基礎與應用”國立編譯館出版。
2. F.Reinitzer, Monatsh. Chem, Vol. 9, 421 (1888).
3. O.Z.Lehmann, Phys. Chem, 4, 4621(1889).
4. 蔡宗岳,“含光學活性單體PSCT液晶顯示元件之光電特性研究”國立成功大學化工研究所碩士論文,(1999)。
5. 蔡月娥, “雙官能機單體間隙長度對PSCT液晶顯示器光電特性效應之研究” 國立成功大學化工研究所碩士論文,(2000)。
6. D.demus, J.Goodby, G.W.Gray, H.W.Spiess, V.Vill, ”Handbook of Liquid crystals”, Vol 2a, 2b, Wiley-VCH, 1998.
7. 黃啟炎, ”液晶-聚合物混合薄膜之光學二倍頻現象之研究” 國立成功大學物理研究所博士論文,(1997)。
8. 林志勤,“鐵電性液晶對聚合物穩定膽固醇液晶薄膜光電特性影響之研究”,國立成功大學物理研究所碩士論文,(1998)。
9. 湯宏東,“含環氧基鐵電性液晶體的合成及性質研究”國立成功大學化工研究所碩士論文,(1998)。
10. M. Irie, Chem. Rev., vol. 100, 1683 (2000).
11. H. Bouas-Laurent, H. Dürr, Pure Appl. Chem., Vol. 73, 639 (2001).
12. 邱顯堂,“化工技術”第八卷第六期,150.
13. I. Shimizu, H. Kokado, E. Inoue, Bull. Chem. Soc. Jpn. Vol. 42, 1730 (1969).
14. S. Xie, A. Natansohn, P. Rochon, Macromolecules. Vol. 27, 1489
(1994)
15. Y. Wu, Y. Demachi, O. Tsutsumi, A. Kanazawa, T. Shiono, T. Ikeda, Macromolecules. Vol. 31, 349 (1998).
16. Y. Wu, Y. Demachi, O. Tsutsumi, A. Kanazawa, T. Shiono, T. Ikeda, Macromolecules. Vol. 31; 1104 (1998).
17. Y. Wu, Y. Demachi, O. Tsutsumi, A. Kanazawa, T. Shiono, T. Ikeda, Macromolecules. Vol. 31, 4457 (1998).
18. H. K. Lee, A. Kanazawa, T. Shiono, T. Ikeda, Chem. Mater. Vol. 10,
1402 (1998).
19. H. K. Lee, K. Doi, H. Harada, O. Tsutsumi, A. Kanazawa, T. Shiono, T. Ikeda, J. Phys. Chem. B, Vol. 104, 7023 (2000).
20. T. Ikeda, O. Tsutsumi, Science, Vol. 268, 1873 (1995).
21. P. Rechon, J. Gosselin, A. Natansohn, S. Xie, Appl Phys Lett ,Vol. 60, 4 (1992)
22. Y. Wu, A. Kanazawa, T. Shiono, T. Ikeda, Q. Zhang, Polymer, Vol. 40, 4787 (1999).
23. K. Amundson, M. Srinivasarao, Liquid crystals for advanced techenologies, 269 (1996).
24. H. K. Lee, K. Doi, A. Kanazawa, T. Shiono, T. Ikeda, T. Fujisawa, M. Aizawa, B. Lee, Polymer, Vol. 41, 1757 (2000).
25. N. Tamaoki, A. V. Parfenov, A. Masaki, H. Matsuda, Adv. Mater. Vol. 9, 1102 (1997).
26. M. Brehmer, J. Lub, P. van de Witte, Adv. Mater. Vol. 10, 1438 (1998).
27. E. Sackmann, J. Am. Chem. Soc. Vol. 93, 7088 (1971).
28. H. K. Lee, K. Doi, Hisako, O. Tsutsumi, A. Kanazawa, T. Shiono, T. Ikeda, J. Phys. Chem. B Vol. 104, 7023 (2000).
29. V. Shibaev, A. Bobrovsky, N. Boiko, Journal of Photochemistry and Photobiology A: Chemistry. Vol. 155, 3 (2003).
30. M. Portugall, H. Ringsdorf, R. Zentel, Makromol. Chem.,Vol. 183, 2311 (1982).
31. X. Meng, A. Natansohn, C.Barrett, P, Rochon, Macromolecules. Vol. 29, 946 (1996).
32. K. Kürschner, P. Strohriegl, Liq. Cryst, Vol. 27, 1595 (2000).
33. S. David, Corrie T. Immrie, Polymer, Vol. 37, 3419 (1996).
34. I. Dierking, L. L. kosbar, A. Afzali-Ardakani, A.C. Lowe, J. Appl. Phys., Vol. 81, 3007 (1997).
35. D. Coates, J. Mater. Chem., Vol. 5, 2063 (1995).
36. E. Akiyama, M. Ohtomo, Y. Nagase, Macromol. Chem. Phys., Vol. 196, 3391 (1995).
37. C.B McARDLE, “Side chain liquid crystal polymers”, (1989)
38. F. Simoni, “Nonlinear optical properties of liquid crystals”,Vol. 2 (1997)
39. H. Stegemeyer, Guest Ed. “Liquid crystal”, (1994)
40. M. O’neill, S. M. Kelly, J. Phys. D: Appl. Phys. 33 R67 (2000)
41. K. Ichimura, Chem. Rev. 1847 (2000).
42. O. Tsutsumi, T. Kitsunai, A. Kanazawa, T. Shiono, T. Ikeda, Macromolecules. Vol. 31, 355 (1998).
43. Z. Liang, H. Ming, Q. Zhang, J. Appl. Phys. Vol. 90, 5866 (2001).
44. S. Xie, A. Natansohn, P. Rochon, Chem. Mater. Vol. 5, 403 (1993).