Polyvinylcinnamate 광배향막의 액정 배향 안정성

임지철; 최시혁; 김환기; 김성수; 송기국; Ji-Chul Lim; Sie-Hyug Choi; Whanki Kim; Sung Soo Kim; Kigook Song

Polymer(Korea), Vol.29, No.4, 413-417, July, 2005

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Polyvinylcinnamate 광배향막의 액정 배향 안정성

Liquid Crystal Alignment Stability of Polyvinylcinnamate Photoalignment Layer

임지철, 최시혁, 김환기¹, 김성수 ¹, 송기국 ^{1, †}

LG.Philips LCD
¹경희대학교 영상정보소재기술연구센터

Ji-Chul Lim, Sie-Hyug Choi, Whanki Kim¹, Sung Soo Kim¹, and Kigook Song^{1, †}

LG.Philips LCD, Gumi 730-726, Korea
¹Materials Research Center for Information Display, Kyung Hee University, Yongin, Gyeonggi-do 449-701, Korea

E-mail:

초록

LCD 배향막으로 응용하기 위하여 광반응성 polyvinylcinnamate 필름 위에서 액정 분자들의 배향에 관한 연구를 수행하였다. 선평광 UV를 polyvinylcinnamate 필름에 노광하면 선택적인 광반응에 의하여 필름 내에 이방성이 형성되고, 필름 표면에 인접한 액정 분자는 고분자와 분자간 상호작용으로 고분자 배향 방향과 동일한 방향으로 늘어선다. 광배향막을 사용한 액정 셀의 열 및 빛에 대한 안정성은 배향막에 UV를 다시 노광하고 열을 가한 후 유도된 액정 배향 변화를 측정하여 조사하였다. 선편광 UV를 여러번 노광한 필름의 경우 처음 노광 방향에 관계없이 최종으로 노광한 편광 UV의 방향에 따라 액정 배향이 유도되었다.

Orientations of liquid crystal molecules on a surface of a film of photoreactive polyvinylcinnamate were investigated in order to apply as an alignment layer of LCD. When the polyvinylcinnamate film was exposed to linearly polarized UV light, optical anisotropy was induced in the film through a selective photoreaction. Liquid crystal molecules on a surface of the film was aligned along the oriented polymer chain direction through intermolecular interactions. Thermal and light stability of the photoaligned LC cell were studied by investigating LC alignment changes after the alignment layer was treated with heat and UV light. When the film was exposed with linearly polarized UV several times, the LC alignment was induced only along the final UV exposure direction.

Keywords:liquid crystal;alignment;photoreaction;stability;polyvinylcinnamate

[References]

Sugiyama T, Kuniyasu S, Kobayashi S, Mol. Cryst. Liq. Cryst., 231, 199 (1993)
Kobayashi S, Iimura Y, SPIE Proc., 2175, 122 (1994)
Ichimura K, Hayashi Y, Thin Solid Films, 235, 101 (1993)
Lee WJ, Lim JC, Paek SH, Song K, Chang JY, Korea Polym. J., 9(6), 339 (2001)
Schadt M, Seiberle H, Schuster A, Nature, 381(6579), 212 (1996)
Schadt M, Schmitt K, Kozinkov V, Chigrinov V, Jpn. J. Appl. Phys., 31, 2155 (1992)
Schadt M, Seiberle H, Schuster A, Kelly S, Jpn. J. Appl. Phys., 34, 3240 (1995)
Obi M, Morino S, Ichimura K, Chem. Mater., 11, 656 (1999)
Ichimura K, Akita Y, Akiyama H, Kudo K, Hayashi Y, Macromolecules, 30(4), 903 (1997)
Tomita H, Kudo K, Ichimura K, Liq. Cryst., 20, 171 (1996)
Iimura Y, Satoh T, Kobayashi S, Hashimoto T, J. Photopolym Sci. Technol., 8, 258 (1995)
Ichimura , Akita Y, Akiyama H, Hayashi Y, Kudo K, Jpn. J. Appl. Phys., 35, L992 (1996)
Kawatsuki N, Matsuyoshi K, Yamamoto T, Macromolecules, 33(5), 1698 (2000)
Lee B, Choi S, Kim Y, Song K, Mol. Cryst. Liq. Cryst., 316, 197 (1998)
Lee BH, Ham SK, Lim JC, Song K, Polym.(Korea), 21(6), 1059 (1997)
Ichmura K, Suzuki Y, Seki T, Hosoki A, Aoki K, Langmuir, 4, 1214 (1988)
Ichmura K, Akiyama H, Kudo K, Ishizuki N, Yamamura S, Liq. Cryst., 20, 423 (1996)
Ichimura K, Liq. Cryst., 3, 67 (1996)
Keddie JL, Jones RA, Cory RA, Europhys. Lett., 27, 59 (1994)
Kajiyama T, Tanaka K, Takahara A, Macromolecules, 28(9), 3482 (1995)

[Referenced By]

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[1] Sugiyama T, Kuniyasu S, Kobayashi S, Mol. Cryst. Liq. Cryst., 231, 199 (1993)

[2] Kobayashi S, Iimura Y, SPIE Proc., 2175, 122 (1994)

[3] Ichimura K, Hayashi Y, Thin Solid Films, 235, 101 (1993)

[4] Lee WJ, Lim JC, Paek SH, Song K, Chang JY, Korea Polym. J., 9(6), 339 (2001)

[5] Schadt M, Seiberle H, Schuster A, Nature, 381(6579), 212 (1996)

[6] Schadt M, Schmitt K, Kozinkov V, Chigrinov V, Jpn. J. Appl. Phys., 31, 2155 (1992)

[7] Schadt M, Seiberle H, Schuster A, Kelly S, Jpn. J. Appl. Phys., 34, 3240 (1995)

[8] Obi M, Morino S, Ichimura K, Chem. Mater., 11, 656 (1999)

[9] Ichimura K, Akita Y, Akiyama H, Kudo K, Hayashi Y, Macromolecules, 30(4), 903 (1997)

[10] Tomita H, Kudo K, Ichimura K, Liq. Cryst., 20, 171 (1996)

[11] Iimura Y, Satoh T, Kobayashi S, Hashimoto T, J. Photopolym Sci. Technol., 8, 258 (1995)

[12] Ichimura , Akita Y, Akiyama H, Hayashi Y, Kudo K, Jpn. J. Appl. Phys., 35, L992 (1996)

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

[14] Lee B, Choi S, Kim Y, Song K, Mol. Cryst. Liq. Cryst., 316, 197 (1998)

[15] Lee BH, Ham SK, Lim JC, Song K, Polym.(Korea), 21(6), 1059 (1997)

[16] Ichmura K, Suzuki Y, Seki T, Hosoki A, Aoki K, Langmuir, 4, 1214 (1988)

[17] Ichmura K, Akiyama H, Kudo K, Ishizuki N, Yamamura S, Liq. Cryst., 20, 423 (1996)

[18] Ichimura K, Liq. Cryst., 3, 67 (1996)

[19] Keddie JL, Jones RA, Cory RA, Europhys. Lett., 27, 59 (1994)

[20] Kajiyama T, Tanaka K, Takahara A, Macromolecules, 28(9), 3482 (1995)