| 研究生: |
田凱欣 Tien, Kai-Hsin |
|---|---|
| 論文名稱: |
含不同液晶元單體及液晶高分子之合成及特性研究 Synthesis and Characterization of Monomers and Liquid Crystalline Polymers Containing Various Mesogenic Groups |
| 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: | 2007 |
| 畢業學年度: | 95 |
| 語文別: | 中文 |
| 論文頁數: | 123 |
| 中文關鍵詞: | 光學活性物 、膽固醇液晶高分子 |
| 外文關鍵詞: | chiral compounds, cholesteric liquid crystalline polymers |
| 相關次數: | 點閱:91 下載:9 |
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本實驗研究合成一系列含有不同末端基團及不同液晶元之液晶性單體和光學活性單體,再利用自由基聚合方法,在相同反應條件下,合成側鏈型液晶高分子均聚物及共聚物。本實驗合成的單體及液晶高分子,使用FT-IR、1H-NMR、EA、TGA、UV、DSC、GPC、X-ray等儀器來加以鑑定與分析。經由偏光顯微鏡分析可將高分子分類為nematic、chiral smectic A及cholesteric液晶。在起始劑3 mol %條件下,所合成液晶高分子之重量平均分子量為7,000~50,000,聚合物之10 wt % 熱重損失皆可達到320 oC以上,因此為一耐熱性質非常優良的材料。利用向列型液晶與光學活性單體摻混,可成功的誘導出膽固醇型液晶相,並研究其相行為及選擇性光反射效應,藉著改變不同的溫度及混合比例,再經由紫外光照射進行交聯反應,可製作出反射不同波長光(R、G、B)之膽固醇型液晶光學薄膜,亦可藉由疊層的方法(stacked)擴張膽固醇型液晶光學薄膜之反射波長域。本研究中,膽固醇型液晶高分子經由改變溫度來探討膽固醇型液晶螺旋距大小及反射波長位移等特性,並添加光致變性之光學活性物於膽固醇型液晶高分子中,經由照射UV光使C=C雙鍵進行光異構化反應,由於E-Z異構物分子構型的改變而影響整體液晶分子的排列,造成有效的改變膽固醇型液晶螺旋距,進而改變選擇性光反射的顏色。因此可利用光罩,製備出具有R、G、B色彩之膽固醇型液晶光學薄膜。本實驗研究所製備之膽固醇型液晶光學薄膜,可應用在光儲存紀錄材料,可饒式電子書顯示器,反射式偏光板及彩色濾光片等領域。
A series of liquid crystalline monomers with various mesogenic and chiral groups were synthesized and characterized. Homopolymers and copolymers were further synthesized by using liquid crystalline monomers in the presence of 3 wt% free radical initiator. The synthesized monomers, homopolymers and copolymers were identified using FT-IR, 1H-NMR, EA, TGA, UV-vis, DSC, GPC, and XRD. Polymers were identified as nematic, chiral smectic A and cholesteric phase based on the textures observed under POM. Molecular weight of the above polymers ranged from 7,000 to 50,000. All polymers revealed high thermal stability and 10 wt% weight losses were found to be above 320 oC. Addition of miscible chiral monomer into nematic liquid crystals induced cholesteric liquid crystal phase with various pitches. Effect of molar ratio and UV irradiation on the variation of colors of cholesteric liquid crystal films were investigated. Cholesteric liquid crystal films reflecting Red (R), Green (G), and Blue (B) colors were fabricated and demonstrated successfully. It was discovered that stacking of the films expand the reflective wavelength. Temperature dependence of the optical properties of the cholesteric films was evaluated. Variation in E/Z configurational isomerization due to UV irradiaton of the C=C segment was also investigated. It was found that UV irradiation through a mask induce the cholesteric film with R, G, and B colors. The results of this investigation suggest that the fabricated cholesteric films could be used in the field of image recording, flexible displays, reflective polarizers, and color filters.
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. W. Chang, SID Symposium Digest of Technical Papers, 31, 64 (2000).
3. G. Meier, E. Sackmann, J. G. Gramaier. “Applications of Liquid Crystals”,
Springer, Berlin (1975).
4. S. Ponti, M. Becchi, C. Oldano, P. Taverna, L. Trossi. Liq. Cryst., 28 591 (2001)
5. A. Y. Bobrovsky, N. I. Boyko, V. P. Shibaev. Chem. Mater., 13, 1998
(2001).
6. A. Y. Bobrovsky, N. I. Boyko, V. P. Shibaev. Liq. Cryst., 28, 919 (2001).
7. A. Y. Bobrovsky, N. I. Boyko, V. P. Shibaev. Liq. Cryst., 26, 1749 (1999).
8. E. Mena, P. Van de witte, J. Lub. Liq. Cryst., 27, 929 (2000).
9. P. Van de witte, E. E. Neuteboom, M. Brehmer, J. Lub. J. Appl. Phys., 85, 7517 (1999).
10. P. Van de witte, J. C. Galan, J. Lub. Liq. Cryst., 24, 819 (1998).
11. F. Reinitzer, Monatsh. Chem., 9, 421, (1888).
12. O. Z. Lehmann. Phys. Chem., 4, 4621, (1889).
13. P. J. Collings. “Liquid Crystals, Nature's Delicate Phase of Matter”, Adam
Hilger, Bristol (1990).
14. 王裕堪,“側鏈型光學活性液晶高分子之合成及光學特性探討”,
國立成功大學化學工程研究所碩士論文 (2006)。
15. 楊博智,“光學活性化合物之合成、物性探討及其在膽固醇型液晶元
件之應用探討”,國立成功大學化學工程研究所博士論文 (2007)。
16. D. Demus, J. Goodby, G. W. Gray, H. W. Spiess, V. Vill. “Handbook of
Liquid crystals”, Vol. 2A, Weinheim, Wiley-VCH (1998).
17. H. S. Kitzerow, C. Bahr. “Chirality in Liquid Crystals”, Chap. 1,
Springer (2001).
18. A. M. Donald, A. H. Windle. “Liquid Crystalline Polymers”, Cambridge
solid state science series, 108 (1992).
19. H. Baumgärtel, E. U. Franck, W. Grünbein. “Topics in Physical
Chemistry”, Vol 3, Chap. 1, New York, Springer (1994).
20. 曾信傑,“紫外光可聚合液晶配方之製備及其作為液晶顯示器光學膜
之應用研究”,國立交通大學應用化學研究所碩士論文 (2003)。
21. 黃國松,“膽石醇液晶/向列型液晶複合系於增亮膜研究” 元智大學化
工研究所碩士論文 (2003)。
22. X. J. Wang, Q. F. Zhou. “Liquid Crystalline Polymers”, World Scientific
(2004).
23. G. W. Gray. “Thermotropic Liquid Crystal”, Wiley (1987).
24. 王宏宇,“含光學活性菠酯基液晶性單體之合成及其在光學元件上之
應用研究”,國立成功大學化學工程研究所博士論文 (2004)。
25. H. Finkelmann, G. Rehage. Adv. Polym. Sci., 60/61, 99 (1984).
26. V. P. Shibaev, N. A. Plate. Adv. Polym. Sci., 60/61, 173 (1984).
27. H. Schubert, H. Dehne. Z. Chem., 12, 241 (1972).
28. H. Stegemeyer. “Liquid Crystals”, 116, (1994).
29. 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)。
30. N. Tamaoki. Adv. Mater., 13, 1135 (2001).
31. D. F. Giovanni, F. P. Nicoletta, G. Chidichimo. Adv. Mater., 17, 1150
(2005).
32. N. Tamaoki, A. V. Parfenov, A. Masaki, H. Matsuda. Adv. Mater., 9, 1102
(1997).
33. J. Lub, D. J. Broer, P. van de Witte. Prog. Org. Coat., 45, 211 (2002).
34. X. Li, S. H. Goh, Y. H. Lai. Liq. Cryst., 29, 675 (2002).
35. A. Y. Bobrovsky, V. P. Shibaev. Adv. Funct. Mater., 12, 367 (2002).
36. A. Natansohn, P. Rochon. Chem. Rev., 102, 4139 (2002).
37. H. K. Lee, K. Doi, H. Harada, O. Tsutsumi, A. Kanazawa, T. Shiono, T.
Ikeda. J. Phys.Chem. B 104, 7023 (2000).
38. B. Comiskey, J. D. Albert, H. Yoshizawa, J. Jacobson. Nature, 394, 253
(1998).
39. R. Wisnieff. Nature, 294, 225 (1998).
40. M. T. Johnson, G. Zhou, R. Zehner, K. Amundson, A. Henzen, J. Kamer.
“High Quality Images on Electronic Paper Displays”, SID 5, 1669,
(2000).
41. 吳耀庭、溫俊祥,電子與材料雜誌,26期,p.68-77 (2005)。
42. M. Schadt, S. V. Belayev, M. I. Barnik. Jpn. J. Appl. Phys., 29, 634
(1990).
43. A. Lavernhe, M. Mitov, C. Binet, C. Bourgerette, Liq. Cryst., 28, 803
(2001).
44. 張阜權、孫榮山、唐偉國編著,“光學”,凡異出版社 (1995)。
45. J. C. Hwang, S. C. Liang, K. H. Liang, J. R. Chang. Liq. Cryst., 26, 925
(1999).
46. V. Shibaev, A. Bobrovsky, N. Boiko, J. Photochem. Photobiol. A 3, 155
(2003).