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Received August 10, 2004
Accepted October 7, 2004
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Schiff Base 단일- 및 이메소제닉화합물의 액정성
Liquid Crystalline Properties of Schiff Base Mono- and Dimesogenic Compounds
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
Soo-Min Lee1
호서대학교 자연과학부, 336-795 충남 아산시 배방면 세출리 산29-1 1한남대학교 자연과학부, 대전시 대덕구 대전 306-791 오정동133
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
jhpark@office.hoseo.ac.kr
Korean Chemical Engineering Research, February 2005, 43(1), 176-180(5), NONE Epub 4 March 2005
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Abstract
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
References
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Demus D, Textures of Liquid Cryustal, Verlag Chemie, New York (1978)
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)
