Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Preparation and Mesomorphic Properties of tetramethylene-1,4-bis (p-oxybenzylidene p-substituted aniline)

Tetramethylene-1,4-bis(p-oxybenzylidene p-substituted aniline)의 합성과 액정성

  • 최옥병 (호서대학교 자연과학대학) ;
  • 박주훈 (호서대학교 자연과학대학) ;
  • 이용섭 (호서대학교 자연과학대학) ;
  • 이환명 (호서대학교 자연과학대학) ;
  • 김기환 (호서대학교 자연과학대학) ;
  • 이은경 (호서대학교 자연과학대학) ;
  • 고경곤 (호서대학교 자연과학대학) ;
  • 이은상 (호서대학교 자연과학대학) ;
  • 소봉근 (한남대학교 자연과학대학) ;
  • 이창준 (한남대학교 자연과학대학) ;
  • 이수민 (한남대학교 자연과학대학)
  • Received : 2006.08.03
  • Accepted : 2006.11.08
  • Published : 2007.04.30
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Abstract

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 $-OCH_3$ were enantiotropically nematic liquid crystal. In contrast, the compounds with X= -I and $-CF_3$ were non-liquid crystal. The nematic forming efficiency of the groups was in the order of -CN > $-OCH_3$ > -Br > -Cl > -F.

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 $-OCH_3$ 화합물은 양방성 네마틱 액정이었으며, 이에 반하여 X= -I와 $-CF_3$ 화합물은 액정상을 형성하지 못하였다. 이 화합물들의 네마틱 그룹 효율은 -CN > $-OCH_3$ > -Br > -Cl > -F 순서이었다.

Keywords

Acknowledgement

Supported by : 호서대학교

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