화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Chemical Engineering Research, Vol.45, No.2, 155-159, April, 2007
Export Citation
Tetramethylene-1,4-bis(p-oxybenzylidene p-substituted aniline)의 합성과 액정성
Preparation and Mesomorphic Properties of tetramethylene-1,4-bis (p-oxybenzylidene p-substituted aniline)
최옥병, 박주훈†, 이용섭, 이환명, 김기환, 이은경, 고경곤, 이은상, 소봉근1, 이창준1, 이수민1
  • 호서대학교 자연과학대학, 336-795 충남 아산시 배방면 세출리 165
  • 1한남대학교 자연과학대학, 306-791 대전시 대덕구 오정동 133
Ok-Byung Choi, Joo-Hoon Park†, Yong-Seop Lee, Whan-Myung Lee, Ki-Hwan Kim, Eun-Kyoung Lee, Kyung-Kon Ko, Eun-Sang Lee, Bong-Keun So1, Chang-Joon Lee1, and Soo-Min Lee1
  • College of Natural Science, Hoseo University, 165, Sechul-ri, Baebang-myun, Asan, Chungnam 336-795, Korea
  • 1College of Natural Science, Hannam University, 133, Ojeong-dong, Daedeok-gu, Daejeon 306-791, Korea
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초록
말단에 두 개의 동일한 schiff base 메소젠과 중앙에 테트라메틸렌 유연격자를 갖는 새로운 이메소제닉 화합물을 합성하였다. 이들의 열적성질 및 액정성은 시차주사열분석기와 가열판이 부착된 편광현미경을 사용하여 조사하였다. X= -F, -Cl, -Br, -CN 및 -OCH3 화합물은 양방성 네마틱 액정이었으며, 이에 반하여 X= -I와 -CF3 화합물은 액정상을 형성하지 못하였다. 이 화합물들의 네마틱 그룹 효율은 -CN > -OCH3 > -Br > -Cl > -F 순서이었다.
A series of new dimesogenic compounds having two identical, terminal Schiff base type mesogens and a central tetramethylene spacer were synthesized. Their thermotropic and mesomorphic properties of the compounds were investigated by differential scanning calorimetry and polarizing microscopy. The compounds with X= -F, -Cl, -Br, -CN and -OCH3 were enantiotropically nematic liquid crystal. In contrast, the compounds with X= -I and -CF3 were non-liquid crystal. The nematic forming efficiency of the groups was in the order of -CN > -OCH3 > -Br > -Cl > -F.
Keywords:Liquid Crystalline Compounds;Dimesogenic Liquid Crystals;Non-Conventional Liquid Crystals
  1. Collings PJ, Liquid Crystals, Princeton University Press, Princeton and Oxford (2002)
  2. Yoon S, Polym. Sci. Technol., 15(6), 674 (2004)
  3. Demus D, Zaschke H, Flussige Kristalle in Tabellen II, VEB Deutscher Verlag fur Grundstoffindustire, Leipzig (1984)
  4. Demus D, Goodby J, Gray GW, Spiess HW, Vill V, Handbook of Liquid Crystals, Wiley-VCH, Weinhem, Vol.1 (1998)
  5. Park JH, Choi OB, Lee JS, Kang KM, Shin JC, Kim KH, Kim HJ, Lee CJ, So BK, Lee SM, Korean Chem. Eng. Res., 43(1), 176 (2005)
  6. Park JH, Lee HM, Choi OB, Lee YS, Ko KK, Lee ES, Song JH, Kim KW, Lee EK, Lee CJ, So BK, Lee SM, J. Kor. Chem. Soc., 50, 263 (2006)
  7. Jin JI, Mol. Cryst. Liq. Cryst., 267, 249 (1995)
  8. Jin JI, Park JH, Eur. Polym. J., 23(12), 973 (1987)
  9. Donahoe HB, Benjamin LE, Fennoy LV, Greiff D, J. Org. Chem., 26, 474 (1961)
  10. Dehne H, Roger A, Demus D, Diele S, Kresse H, Pelzl G, Wedeler W, Liq. Cryst., 6, 47 (1989)
  11. Park JH, Choi OB, Shin JC, Kang KM, Kim KH, Lee CJ, So BK, Lee SM, J. Kor. Chem, Soc., 48(3), 322 (2004)
  12. Demus D, Textures of Liquid Crystals, Verlag Chemie, N.Y. (1978)
  13. Jin JI, Kang JS, Jo BW, Lenz RW, Bull. Korean Chem. Soc., 4(4), 176 (1983)
  14. Jin JI, Park JH, Mol. Cryst. Liq. Cryst., 110, 293 (1984)
  15. Gray GW, Winsor PA, Liquid Crystals and Plastic Crystals, John wiley and Sons Inc, London, Vol.1.1. 115-125 (1974)
  16. Jin JI, Mol. Cryst. Liq. Cryst., 267, 249 (1995)