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Synthesis and Characterization of Polyamide Having Photoreactive Group in the Backbone and its Liquid Crystal Aligning Property  

Jung, Eun-Young (School of Display & Chemical Engineering. Yeungnam University)
Lee, Tae-Jin (School of Display & Chemical Engineering. Yeungnam University)
Lee, Seung-Woo (School of Display & Chemical Engineering. Yeungnam University)
Publication Information
Polymer(Korea) / v.35, no.4, 2011 , pp. 350-355 More about this Journal
Abstract
A soluble polyamide containing photosensitive l,4-phenylenediacrylic acid (PDA) in main chain with biphenyl moiety was synthesized. The chemical structure of synthesized polyamide was investigated by means of $^1H$ NMR spectroscopy. The polymer was stable up to $280^{\circ}C$ and soluble in organic solvents, giving a good quality of thin films. The photoreaction of unpolarized LTV irradiated films was investigated by means of UV-vis absorption spectroscopy and FTlR spectroscopy, and liquid crystals (LCs) alignment property was examined by exposing to linearly polarized UV light (LPUVL) of 260~380 nm. The polyamide in film has excellent photoreactivity to unpolarized UV light. Direction selective photoreaction of PDA moiety in Lhe film was found to further induce nematic liquid -crystals to align along a perpendicular direction with respect to the electric vector of LPUVL, regardless of exposure energy of LPUVL. In addition, pretilt angle was measured by means of crystal rotation method. LPUVL-exposed polymer film induced the alignment of liquid-crystals (LC) with a pretilt angle of 0.2~$0.5^{\circ}$.
Keywords
photo-reactive polyamide; liquid crystals; alignment layer; photo reactivity; pretilt angle;
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  • Reference
1 S. W. Lee, T. Chang, and M. Ree, Macromol. Rapid Commun., 22, 941 (2001).   DOI   ScienceOn
2 S. W. Lee, S. I. Kim, B. Lee, W. Choi, B. Chae, S. B. Kim, and M. Ree, Macromolecules, 36, 6527 (2003).   DOI   ScienceOn
3 M. Hasegawa, Jpn. J. Appl. Phys., 38, L457 (1999).   DOI
4 K. Ichimura, Y. Akita, Y. H. Akiyama, K. Kudo, and Y. Hayashi, Macromolecules, 30, 903 (1997).   DOI   ScienceOn
5 B. S. Ban, Y. N. Rim, and Y. B. Kim, Liq. Cryst., 27, 125(2000).   DOI
6 K. Ichimura, Chem. Rev., 100, 1847 (2000).   DOI   ScienceOn
7 W. M. Gibbons, P. J. Shannon, S. T. Sun, and B. J. Swetlin, Nature, 351, 49 (1991).   DOI
8 M. O`Neill and S. M. Kelly, J. Phys. D: Appl. Phys., 33, R67 (2000).   DOI   ScienceOn
9 M. Obi, S. Morino, and K. Ichimura, Chem. Mater., 11, 656 (1996).
10 P. O. Jackson, M. Oneill, W. L. Duffy, P. Hindmarsh, S. M. Kelly, and G. Owen, Chem. Mater., 13, 694 (2001).   DOI   ScienceOn
11 B. Chae, S. W. Lee, Y. M. Jung, M. Ree, and S. B. Kim, Langmuir, 19, 687 (2003).   DOI   ScienceOn
12 S. W. Lee, S. I. Kim, B. Lee, H. C. Kim, T. Chang, and M. Ree, Langmuir, 19, 10381 (2003).   DOI   ScienceOn
13 D. S. Seo, S. Kobayashi, and M. Nishikawa, Appl. Phys. Lett., 62, 2392 (1992).
14 S. W. Lee and M. Ree, J. Polym. Sci. Part A: Polym. Chem., 42, 1322 (2004).   DOI   ScienceOn
15 J. A. Castellano, Liquid Crystal Display: Handbook of Display Technology, Academic, San Diego, CA, Chap.8, p181-252 (1992).
16 W. C. O'Mara, Liquid Crystal Flat Panel Display, van Nostrand & Reinhold, New York, 1992.
17 B. S. Ban and Y. B. Kim, J. Am. Chem. Soc., 103, 3869 (1999).
18 E. S. Lee, P. Vetter, T. Miyahita, and T. Uchida, Jpn. J. Appl. Phys., 32, L1339 (1993).   DOI
19 M. G. Samant, J. Stohr, H. R. Brown, T. P. Russell, J. M. Sands, and S. K. Kumar, Macromolecules, 29, 8334 (1996).   DOI   ScienceOn
20 S. W. Lee, S. J. Lee, S. G. Hahm, T. J. Lee, B. Lee, B. Chae, S. B. Kim, J. C. Jung, W. C. Zin, B. H. Sohn, and M. Ree, Macromolecules, 38, 4331 (2005).   DOI   ScienceOn
21 B. Chae, S. W. Lee, B. Lee, W. Choi, S. B. Kim, Y. M. Jung, J. C. Jung, K. H. Lee, and M. Ree, J. Phys. Chem. B, 107, 11911 (2003).   DOI   ScienceOn
22 M. Schadt, H. Seiberle, and A. Schuster, Nature, 381, 212 (1996).   DOI   ScienceOn
23 M. Schadt, K. Schmitt, V. Kozinkov, and V. Chigrinov, Jpn. J. Appl. Phys., 31, 2115 (1992).