Molecular Weight Dependence of Aggregation Structure and Electro-Optical Properties of Polymer/Liquid Crystal Composite films

Hwan-Kyeong Jeong; Noh Hee Jeong; Ki-Dae Nam; Hirotsugu Kikuchi; Tisato Kajiyama

Journal of Industrial and Engineering Chemistry, Vol.4, No.3, 251-257, September, 1998

Hwan-Kyeong Jeong^†, Noh Hee Jeong¹, Ki-Dae Nam¹, Hirotsugu Kikuchi, and Tisato Kajiyama

Department of Materials Physics and Chemistry, Kyushu University, Fukuoka 812-81, Japan
¹Department of Industrial and Engineering Chemistry, Chungbuk National University, Chungbuk 361-73, Korea

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The relationship between the polymer molecular weight and the electro-optical properties was investigated for the polymer/liquid crystal (LC) composite film prepared by a solvent-induced phase separation method. Poly(methyl methacrylate) (PMMA) and poly(diisopropyl fumarate) (Pdi-iPF) with significantly different weight-average molecular weight (Mw) were used as the matrix for the Polymer/LC composite film. It is confirmed from morphological observation by scanning electron microscope (SEM) that the size of LC channel or domain was strongly dependent on Mw of PMMA and Pdi-ipF. With increasing Mw in PMMA/LC composite film, the switching hysteresis was decreased due to a decrease of the compatibility at the polymer-LC interface. The hysteresis in (Pdi-iPF/LC) composite film was not detected for electro-optical switching and this result is not changed with Mw of Pdi-iPF.

Keywords:polymer/liquid crystal composite system;aggregation structure;molecular weight;electro-optical properties;switching hysteresis

[References]

Kajiyama T, Nagata Y, Maemura E, Takayanagi M, Chem. Lett., 676 (1979)
Kajiyama T, Nagata Y, Washizu S, Takayanagi M, J. Membr. Sci., 11, 39 (1982)
Washizu S, Terada I, Kajiyama T, Takayanagi M, Polym. J., 16, 307 (1984)
Kajiyama T, J. Macromol. Sci.-Chem., A25, 583 (1988)
Kajiyama T, Washizu S, Ohmori Y, J. Membr. Sci., 24, 73 (1985)
Kajiyama T, Kikuchi H, Shinkai S, J. Membr. Sci., 36, 243 (1988)
Kajiyama T, Kikuchi H, Katayose M, Shinkai S, New Polym. Mater., 1, 99 (1988)
Shinkai S, Torigoe K, Manabe O, Kajiyama T, J. Am. Chem. Soc., 109, 4458 (1987)
Kajiyama T, Takahara A, Kikuchi H, Polym. J., 23, 347 (1991)
Fergason JL, SID Int. Symp. Dig. Technol., 16, 85 (1985)
Doane JW, Vaz NA, Wu BG, Zumer S, Appl. Phys. Lett., 48, 269 (1986)
Kajiyama T, Miyamoto A, Kikuchi H, Morimura Y, Chem. Lett., 813 (1989)
Doane JW, Golemme A, West JL, Whitehead JB, Wu BG, Mol. Cryst. Liq. Cryst., 165, 511 (1988)
Hirai Y, Niiyama S, Ooi Y, Kuniqita M, Kumai H, Yuki M, Gunjima T, SID' 91 Digest, 549 (1991)
Kajiyama T, Park K, Usui F, Kikuchi H, Takahara A, Proc. SPIE, 1911, 122 (1993)
Miyamoto A, Kikuchi H, Kobayashi S, Morimura Y, Kajiyama T, Macromolecules, 24, 3915 (1991)
Nolan P, Tillin M, Coates D, Liq. Cryst., 14, 339 (1993)
Kajiyama T, Yonekura O, Nishiwaki J, Kikuchi H, Proc. SPIE, 2175, 88 (1994)
Ono H, Kawatsuki N, Jpn. J. Appl. Phys., 33, 6268 (1994)
Kikuchi H, Nishiwaki J, Kajiyama T, Polym. J., 27, 1246 (1995)
Jeong HK, Jeong NH, Kikuchi H, Kajiyama T, J. Ind. Eng. Chem., 3(4), 269 (1997)
Jeong HK, Kikuchi H, Kajiyama T, Polym. Prepr. Jpn., 44, 345 (1995)
Kim BK, Ok YS, Choi CH, J. Polym. Sci. B: Polym. Phys., 33(4), 707 (1995)
Shen CS, Kyu T, J. Chem. Phys., 102(1), 556 (1995)
Jeong HK, Kikuchi H, Kajiyama T, Polymer, will be submitted for publication

[Referenced By]

[1] Kajiyama T, Nagata Y, Maemura E, Takayanagi M, Chem. Lett., 676 (1979)

[2] Kajiyama T, Nagata Y, Washizu S, Takayanagi M, J. Membr. Sci., 11, 39 (1982)

[3] Washizu S, Terada I, Kajiyama T, Takayanagi M, Polym. J., 16, 307 (1984)

[4] Kajiyama T, J. Macromol. Sci.-Chem., A25, 583 (1988)

[5] Kajiyama T, Washizu S, Ohmori Y, J. Membr. Sci., 24, 73 (1985)

[6] Kajiyama T, Kikuchi H, Shinkai S, J. Membr. Sci., 36, 243 (1988)

[7] Kajiyama T, Kikuchi H, Katayose M, Shinkai S, New Polym. Mater., 1, 99 (1988)

[8] Shinkai S, Torigoe K, Manabe O, Kajiyama T, J. Am. Chem. Soc., 109, 4458 (1987)

[9] Kajiyama T, Takahara A, Kikuchi H, Polym. J., 23, 347 (1991)

[10] Fergason JL, SID Int. Symp. Dig. Technol., 16, 85 (1985)

[11] Doane JW, Vaz NA, Wu BG, Zumer S, Appl. Phys. Lett., 48, 269 (1986)

[12] Kajiyama T, Miyamoto A, Kikuchi H, Morimura Y, Chem. Lett., 813 (1989)

[13] Doane JW, Golemme A, West JL, Whitehead JB, Wu BG, Mol. Cryst. Liq. Cryst., 165, 511 (1988)

[14] Hirai Y, Niiyama S, Ooi Y, Kuniqita M, Kumai H, Yuki M, Gunjima T, SID' 91 Digest, 549 (1991)

[15] Kajiyama T, Park K, Usui F, Kikuchi H, Takahara A, Proc. SPIE, 1911, 122 (1993)

[16] Miyamoto A, Kikuchi H, Kobayashi S, Morimura Y, Kajiyama T, Macromolecules, 24, 3915 (1991)

[17] Nolan P, Tillin M, Coates D, Liq. Cryst., 14, 339 (1993)

[18] Kajiyama T, Yonekura O, Nishiwaki J, Kikuchi H, Proc. SPIE, 2175, 88 (1994)

[19] Ono H, Kawatsuki N, Jpn. J. Appl. Phys., 33, 6268 (1994)

[20] Kikuchi H, Nishiwaki J, Kajiyama T, Polym. J., 27, 1246 (1995)

[21] Jeong HK, Jeong NH, Kikuchi H, Kajiyama T, J. Ind. Eng. Chem., 3(4), 269 (1997)

[22] Jeong HK, Kikuchi H, Kajiyama T, Polym. Prepr. Jpn., 44, 345 (1995)

[23] Kim BK, Ok YS, Choi CH, J. Polym. Sci. B: Polym. Phys., 33(4), 707 (1995)

[24] Shen CS, Kyu T, J. Chem. Phys., 102(1), 556 (1995)

[25] Jeong HK, Kikuchi H, Kajiyama T, Polymer, will be submitted for publication