High Out-of-Plane Alignment of Liquid Crystalline Methacrylate Copolymer Bearing Photoreactive 4-Styrylpyridine Moiety

Giseop Kwak; Jong-Yun Kong; Min-Woo Kim; Seok-Hee Hyun; Woo-Sik Kim

Macromolecular Research, Vol.17, No.4, 271-275, April, 2009

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High Out-of-Plane Alignment of Liquid Crystalline Methacrylate Copolymer Bearing Photoreactive 4-Styrylpyridine Moiety

Giseop Kwak, Jong-Yun Kong, Min-Woo Kim, Seok-Hee Hyun, and Woo-Sik Kim^†

Department of Polymer Science, Kyungpook National University, Daegu 702-701, Korea

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This paper describes the out-of-plane order of a liquid crystalline (LC) methacrylate copolymer (3) comprised of a methacrylate (1) with a 4-styrylpyridine moiety as the photo-cyclodimerizable group and a benzoate moiety as the mesogenic group in the side chain, and another methacrylate (2) with a 4-(4-methoxyphenyl)benzoate moiety as the mesogenic group. The composition of 1 and 2 units in 3 was estimated to have a molar ratio of 54.2:45.8 by 1H NMR spectroscopy. The X-ray diffraction study revealed that the copolymer forms a partial bilayer smectic structure. The copolymer gave rise to a high out-of-plane order parameter of about 0.74 in a wide LC temperature range of 110~160 ℃ after linearly polarized, UV light irradiation and subsequent annealing. Moreover, the external reflection IR analysis indicated that excess UV-light irradiation makes the out-of-plane LC structure of the copolymer appear in a higher and wider temperature range.

Keywords:out-of-plane alignment;liquid crystal;methacrylate copolymer;4-styrylpyridine;UV irradiation;annealing.

[References]

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Wu YL, Ikeda T, Zhang QJ, Adv. Mater., 11(4), 300 (1999)
Han M, Morino S, Ichimura K, Chem. Lett., 645 (1999)
Kawatsuki N, Suehiro C, Yammamoto T, Macromolecules, 13, 5984 (1998)
Han M, Ichimura K, Macromolecules, 34(1), 90 (2001)
Kawatsuki N, Matsuyoshi K, Hayashi M, Takatsuka H, Yamamoto T, Chem. Mater., 12, 1549 (2000)
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Kawatsuki N, Hayashi M, Yamamoto T, Macromol. Chem. Phys., 202, 3087 (2001)
Wu YL, Demachi Y, Tsutsumi O, Kanazawa A, Shiono T, Ikeda T, Macromolecules, 31(2), 349 (1998)
Bobrosky A, Boiko N, Shibaev V, Stumpe J, J. Photochem. Photobiology A : Chem., 163, 347 (2004)
Kawatsuki N, Furuso N, Uchida E, Yamamoto T, Macromol. Chem. Phys., 203, 2438 (2002)
Kawatsuki N, Yamamoto T, Appl. Phys. Lett., 74, 935 (1999)
Kwak G, Kim MW, Park DH, Kong JY, Hyun SH, Kim WS, J. Polym. Sci. Part A : Polym. Chem., 46, 5371 (2008)
Finkelmann H, Ringsdorf H, Wendorff JH, Makromol. Chem., 179, 273 (1978)
Portugall M, Ringsdorf H, Zentel R, Makromol. Chem., 183, 2311 (1982)
Kim WS, Lee JW, Kwak YW, Lee JK, Park YT, Yoh SD, Polym. J., 33, 643 (2001)
Yamaki S, Nakagawa M, Morino S, Ichimura K, Macromol. Chem. Phys., 202, 354 (2001)
Ichimura K, Oohara N, J. Polym. Sci. Part A: Polym. Chem., 25, 3063 (1987)
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Date RW, Fawcett AH, Geue T, Haferkorn J, Malcolm RK, Stumpe J, Macromolecules, 31(15), 4935 (1998)

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[1] Penterman R, Klink SI, de Koning H, Nisato G, Broer DJ, Nature, 417, 55 (2001)

[2] Nam SW, Kang SH, Chang JY, Macromol. Res., 15(1), 74 (2007)

[3] Meier JG, Ruhmann R, Stumpe J, Macromolecules, 33(3), 843 (2000)

[4] Anderle K, Birenheide R, Eich M, Wenderff JH, Macromol. Rapid Commun., 10, 477 (1989)

[5] Wu YL, Ikeda T, Zhang QJ, Adv. Mater., 11(4), 300 (1999)

[6] Han M, Morino S, Ichimura K, Chem. Lett., 645 (1999)

[7] Kawatsuki N, Suehiro C, Yammamoto T, Macromolecules, 13, 5984 (1998)

[8] Han M, Ichimura K, Macromolecules, 34(1), 90 (2001)

[9] Kawatsuki N, Matsuyoshi K, Hayashi M, Takatsuka H, Yamamoto T, Chem. Mater., 12, 1549 (2000)

[10] Kawatsuki N, Matsuyoshi K, Yamamoto T, Macromolecules, 33(5), 1698 (2000)

[11] Kawatsuki N, Hayashi M, Yamamoto T, Macromol. Chem. Phys., 202, 3087 (2001)

[12] Wu YL, Demachi Y, Tsutsumi O, Kanazawa A, Shiono T, Ikeda T, Macromolecules, 31(2), 349 (1998)

[13] Bobrosky A, Boiko N, Shibaev V, Stumpe J, J. Photochem. Photobiology A : Chem., 163, 347 (2004)

[14] Kawatsuki N, Furuso N, Uchida E, Yamamoto T, Macromol. Chem. Phys., 203, 2438 (2002)

[15] Kawatsuki N, Yamamoto T, Appl. Phys. Lett., 74, 935 (1999)

[16] Kwak G, Kim MW, Park DH, Kong JY, Hyun SH, Kim WS, J. Polym. Sci. Part A : Polym. Chem., 46, 5371 (2008)

[17] Finkelmann H, Ringsdorf H, Wendorff JH, Makromol. Chem., 179, 273 (1978)

[18] Portugall M, Ringsdorf H, Zentel R, Makromol. Chem., 183, 2311 (1982)

[19] Kim WS, Lee JW, Kwak YW, Lee JK, Park YT, Yoh SD, Polym. J., 33, 643 (2001)

[20] Yamaki S, Nakagawa M, Morino S, Ichimura K, Macromol. Chem. Phys., 202, 354 (2001)

[21] Ichimura K, Oohara N, J. Polym. Sci. Part A: Polym. Chem., 25, 3063 (1987)

[22] Li SKL, Guillet JE, Macromolecules, 10, 840 (1977)

[23] Date RW, Fawcett AH, Geue T, Haferkorn J, Malcolm RK, Stumpe J, Macromolecules, 31(15), 4935 (1998)