Schiff Base 단일- 및 이메소제닉화합물의 액정성

박주훈; 최옥병; 이진석; 강근명; 신주철; 김기환; 김학진; 이창준; 소봉근; 이수민; Joo-Hoon Park; Ok-Byung Choi; Jin-Seok Lee; Keun-Myoung Kang; Joo-Cheol Shin; Ki-Hwan Kim; Hak-Jin Kim; Chang-Joon Lee; Bong-Keun So; Soo-Min Lee

Korean Chemical Engineering Research, Vol.43, No.1, 176-180, February, 2005

Export Citation

Schiff Base 단일- 및 이메소제닉화합물의 액정성

Liquid Crystalline Properties of Schiff Base Mono- and Dimesogenic Compounds

박주훈^†, 최옥병, 이진석, 강근명, 신주철, 김기환, 김학진¹, 이창준¹, 소봉근¹, 이수민¹

호서대학교 자연과학부, 336-795 충남 아산시 배방면 세출리 산29-1
¹한남대학교 자연과학부, 대전시 대덕구 대전 306-791 오정동133

Joo-Hoon Park^†, Ok-Byung Choi, Jin-Seok Lee, Keun-Myoung Kang, Joo-Cheol Shin, Ki-Hwan Kim, Hak-Jin Kim¹, Chang-Joon Lee¹, Bong-Keun So¹, and Soo-Min Lee¹

School of Natural Science, Hoseo University, San 29-1, Sechul-ri, Baebang-myun, Asan, Chungnam 336-795, Korea
¹School of Natural Science, Hannam University, 133, Ojeong-dong, Daedeok-gu, Daejeon 306-791, Korea

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초록

방향족 Schiff base 메소제닉 단위와 폴리메틸렌 유연격자로 이루어진 한 계열의 주사슬 액정중합체와 네 계열 화합물의 액정성을 살펴보았다. 이들의 열적 성질과 액정성은 시차 주사 열분석기와 가열판이 부착된 편광현미경에 의하여 조사하였다. 중합체와 화합물 액정상의 성질은 중앙 폴리메틸렌 유연격자와 말단 알콕시기의 길이에 크게 의존하였다. 중합체 I과 계열 III 화합물은 녹는점과 등방성액체화 전이온도에서 짝수-홀수 효과를 보여 주었으나 계열 II와 IV 화합물은 등방성액체화 전이온도에서만 짝수-홀수 효과를 나타내었다. 편광현미경을 통하여 이들의 광학구조를 관찰 하였을 때 네마틱과 스멕틱 액정상을 형성하였다.

The liquid crystalline properties of a series of main chain liquid crystalline polymers and four series compounds consisting of aromatic type Schiff base mesogenic units and polymethylene flexible spacers were studied. The thermal and liquid crystalline properties were investigated by differential scanning calorimetry and on the hot stage of a polarizing microscope. The nature of the liquid crystalline phase of the polymers and compounds depended greatly on the length of the central polymethylene spacer and on the terminal alkoxy groups. Polymers I and Series III exhibited an even-odd effect in melting and isotropization temperatures but Series II and Series IV exhibited an even-odd effect in isotropization temperatures. They formed nematic and smectic mesophases in melts as judged by their optical textures observed through a polarizing microscope.

Keywords:Liquid Crystalline Compounds;Non-Conventional Liquid Crystals;Dimesogenic Liquid Crystals;Schiff Base Mesogen

[References]

Collings PJ, Liquid Crystals, Princeton university Press, Princeton and Oxford (2002)
Demus D, Goodby J, Gray GW, Spiess HW, Vill V, Handbook of Liquid Crystals, Wiley-VCH, Weinheim, Vol. 1. (1998)
Collings PJ, Hird M, Introduction to Liquid Crystals, Taylor & Francis, London (1997)
Demus D, Demus H, Zaschke H, Flussige Kristalle in Tabellen, VEB Deutscher Verlag fur Grundstoffindustire, Leipzig (1974)
Demus D, Zaschke H, Flussige Kristalle in Tabellen II, VEB Deutscher Verlag fur Grundstoffindustire, Leipzig (1984)
Demus D, Goodby J, Gray GW, Spiess HW, Vill V, Handbook of Liquid Crystals, Wiley-VCH, Weinheim, Vol. 2B (1998)
Henderson PA, Niemeyer O, Imrie CT, Liq. Cryst., 28(3), 463 (2001)
Park JH, Lee HM, Choi OB, Lee CJ, So BK, Lee SM, J. Korean Chem. Soc., 45(6), 562 (2001)
Park JH, Kim EY, Choi OB, Kim KS, So BK, Lee SM, J. Korean Chem. Soc., 45(1), 67 (2001)
Kim JH, Lee SM, Jin JI, J. Korean Chem. Soc., 42(6), 679 (1998)
Andersch J, Tschierske C, Liq. Cryst., 21(1), 51 (1996)
Weissflog W, Demus D, Diele S, Nitschke P, Wedler W, Liq. Cryst., 5(1), 111 (1989)
Imric CT, Structure and Bonding, 95, 149 (1999)
Huh SM, Jin JI, Achard MF, Hardouin F, Liq. Cryst., 25(3), 285 (1998)
Jin JI, Choi EJ, Ryu SC, Lenz RW, Polym. J., 18(1), 63 (1986)
Jin JI, Park JH, Eur. Polym. J., 23(12), 973 (1987)
Griffin AC, Britt TR, J. Am. Chem. Soc., 103, 4957 (1981)
Jin JI, Oh HT, Park JH, J. Chem. Soc.-Perkin Trans. 2, 343 (1986)
Jin JI, Mol. Cryst. Liq. Cryst., 267, 249 (1995)
Jin JI, Park JH, Mol. Cryst. Liq. Cryst., 110, 293 (1984)
Donahoe HB, Benjamin LE, Fenney LV, Greiff D, J. Org. Chem., 26, 474 (1961)
Demus D, Textures of Liquid Cryustal, Verlag Chemie, New York (1978)

[Referenced By]

[1] Collings PJ, Liquid Crystals, Princeton university Press, Princeton and Oxford (2002)

[2] Demus D, Goodby J, Gray GW, Spiess HW, Vill V, Handbook of Liquid Crystals, Wiley-VCH, Weinheim, Vol. 1. (1998)

[3] Collings PJ, Hird M, Introduction to Liquid Crystals, Taylor & Francis, London (1997)

[4] Demus D, Demus H, Zaschke H, Flussige Kristalle in Tabellen, VEB Deutscher Verlag fur Grundstoffindustire, Leipzig (1974)

[5] Demus D, Zaschke H, Flussige Kristalle in Tabellen II, VEB Deutscher Verlag fur Grundstoffindustire, Leipzig (1984)

[6] Demus D, Goodby J, Gray GW, Spiess HW, Vill V, Handbook of Liquid Crystals, Wiley-VCH, Weinheim, Vol. 2B (1998)

[7] Henderson PA, Niemeyer O, Imrie CT, Liq. Cryst., 28(3), 463 (2001)

[8] Park JH, Lee HM, Choi OB, Lee CJ, So BK, Lee SM, J. Korean Chem. Soc., 45(6), 562 (2001)

[9] Park JH, Kim EY, Choi OB, Kim KS, So BK, Lee SM, J. Korean Chem. Soc., 45(1), 67 (2001)

[10] Kim JH, Lee SM, Jin JI, J. Korean Chem. Soc., 42(6), 679 (1998)

[11] Andersch J, Tschierske C, Liq. Cryst., 21(1), 51 (1996)

[12] Weissflog W, Demus D, Diele S, Nitschke P, Wedler W, Liq. Cryst., 5(1), 111 (1989)

[13] Imric CT, Structure and Bonding, 95, 149 (1999)

[14] Huh SM, Jin JI, Achard MF, Hardouin F, Liq. Cryst., 25(3), 285 (1998)

[15] Jin JI, Choi EJ, Ryu SC, Lenz RW, Polym. J., 18(1), 63 (1986)

[16] Jin JI, Park JH, Eur. Polym. J., 23(12), 973 (1987)

[17] Griffin AC, Britt TR, J. Am. Chem. Soc., 103, 4957 (1981)

[18] Jin JI, Oh HT, Park JH, J. Chem. Soc.-Perkin Trans. 2, 343 (1986)

[19] Jin JI, Mol. Cryst. Liq. Cryst., 267, 249 (1995)

[20] Jin JI, Park JH, Mol. Cryst. Liq. Cryst., 110, 293 (1984)

[21] Donahoe HB, Benjamin LE, Fenney LV, Greiff D, J. Org. Chem., 26, 474 (1961)

[22] Demus D, Textures of Liquid Cryustal, Verlag Chemie, New York (1978)