| 研究生: |
王素誼 Wang, Su-Yi |
|---|---|
| 論文名稱: |
光異構性偶氮型液晶之合成及其光電特性探討 Synthesis and Electro-Optical Properties of Azobenzene Liquid crystal. |
| 指導教授: |
劉瑞祥
Liu, J. H. |
| 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: | 2002 |
| 畢業學年度: | 90 |
| 語文別: | 中文 |
| 論文頁數: | 92 |
| 中文關鍵詞: | 偶氮型液晶 、光學開關 |
| 外文關鍵詞: | azobenzene liquid crystal, optical switching |
| 相關次數: | 點閱:90 下載:3 |
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本研究中將液晶及單體混合均勻後,利用熱聚合誘導相分離法製成PDLC薄膜。當系統中添加偶氮苯分子時,可利用照射不同波長的光使其在光散射(OFF)及光穿透(ON)兩種狀態間轉換。本研究中合成數種偶氮苯化合物,如4-alkyloxy-4’-methoxyazobenzene,其碳鏈長度分別為3 ~ 6,以及兩種帶有光學活性基團之化合物amyl 4-(4-hexyloxyphenylazo)benzoate及bornyl 4-(4-hexyloxyphenylazo) benzoate,所合成之化合物均以FTIR, NMR, DSC等加以定性分析。本研究中探討不同的偶氮苯分子對薄膜系統光化學相轉移行為的影響,以及最佳偶氮苯化合物與液晶含量之組成。由實驗結果發現,側鏈碳數為5之化合物(AzoC5)系統具有較快之感應時間及較佳之光開關效果,經實驗所得出的最佳重量組成為:EGDMA/E7/AzoC5 = 14/80/6。研究中並探討不同碳鏈長度的單官能性單體與雙官能性單體EGDMA 混合聚合後,對光開關系統所產生的光學特性影響。由結果可知高分子側鏈之導入會影響光開關的感應時間,而照可見光回復時,其可較快速回復至初始的光穿透度值。光誘導相變化性之可重複性、信賴性、及對溫度之依存性等,本研究中均有詳細之敍述。以光罩曝光所形成之光記錄可行性,文中亦有所探討。
PDLC films were fabricated by thermal polymerization with E7 liquid crystal and various monomers. A series of azobenzene derivatives of 4-alkyloxy-4’-methoxyazobenzene with carbon numbers of 3 to 6, and chiral compounds of amyl-4-(4-hexyloxyphenylazo)benzoate and bornyl-4-(4-hexyloxyphenylazo)benzoate were synthesized. The compounds synthesized in this investigation were identified by using FTIR, NMR and DSC. PDLC films with azo compound express photosensitive Nematic-Isotropic (N-I) phase transition due to the photo-convertible E/Z structures of azo compounds. Effects of azo compounds on the photochemical properties of PDLC films and the optimal composition of the films were studied. The optimal PDLC film with better response speed and photochemical properties was fabricated by AzoC5 system. In this case, the weight ratio of EGDMA/E7/AzoC5 is 14/80/6. The dependence of functional groups of monomers on the photochemical properties of films, photo-induced phase transition, reproducibility and reliability of the PDLC films were all investigated. It was found that the existence of polymer side chain may influence the response time of the films, and increase the recover speed significantly. The possibility of real image recording through a photo-mask of the PDLC films was also evaluated.
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. L.Bouteiller, P. Le Barny, Liq. Cryst., Vol. 21, 157 (1996).
11. M. Irie, Chem. Rev., vol. 100, 1683 (2000).
12. H. Bouas-Laurent, H. Dürr, Pure Appl. Chem., Vol. 73, 639 (2001).
13. 邱顯堂,“化工技術”第八卷第六期,150
14. I. Shimizu, H. Kokado, E. Inoue, Bull. Chem. Soc. Jpn. Vol. 42, 1730 (1969).
15. H. K. Lee, A. Kanazawa, T. Shiono, T. Ikeda, Chem. Mater. Vol. 10, 1402 (1998).
16. H. K. Lee, K. Doi, H. Harada, O. Tsutsumi, A. Kanazawa, T. Shiono, T. Ikeda, J. Phys. Chem. B, Vol. 104, 7023 (2000).
17. T. Ikeda, O. Tsutsumi, Science, Vol. 268, 1873 (1995).
18. K. Amundson, M. Srinivasarao, Liquid crystals for advanced techenologies, 269 (1996).
19. H. K. Lee, K. Doi, A. Kanazawa, T. Shiono, T. Ikeda, T. Fujisawa, M. Aizawa, B. Lee, Polymer, Vol. 41, 1757 (2000).
20. M. Portugall, H. Ringsdorf, R. Zentel, Makromol. Chem.,Vol. 183, 2311 (1982).
21. K. Kürschner, P. Strohriegl, Liq. Cryst., Vol. 27, 1595 (2000).
22. Stewart and Corrie T. Immrie, Polymer, Vol. 37, 3419 (1996).
23. I. Dierking, L.L. kosbar, A. Afzali-Ardakani, A.C. Lowe, J. Appl. Phys., Vol. 81, 3007 (1997).
24. D. Coates, J. Mater. Chem., Vol. 5, 2063 (1995).
25. E. Akiyama, M. Ohtomo, Y. Nagase, Macromol. Chem. Phys., Vol. 196, 3391 (1995).
26. C.B McARDLE, “Side chain liquid crystal polymers”, (1989)
27. F. Simoni, “Nonlinear optical properties of liquid crystals”,Vol. 2 (1997)
28. H. Stegemeyer, Guest Ed. “Liquid crystal”, (1994)
29. M. O’neill, S. M. Kelly, J. Phys. D: Appl. Phys. 33 R67 (2000)
30. K. Ichimura, Chem. Rev. 1847 (2000).
31. O. Tsutsumi, T. Kitsunai, Macromolecules, 355 (1998).
32. Z. Liang, H. Ming, Q. Zhang, J. Appl. Phys. Vol. 90, 5866 (2001).
33. S. Xie, A. Natansohn, P. Rochon, Chem. Mater. Vol. 5, 403 (1993).