Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Solubility of Liquid Crystalline Hydroxypropyl Chitin in Organic Solvent

액정성 히드록시프로필키틴의 유기용매에 대한 용해성

  • Lee, Young Moo (Dept. of Industrial Chemistry, College of Engineering, Hanyang University) ;
  • Kim, Seong Soo (Dept. of Industrial Chemistry, College of Engineering, Hanyang University) ;
  • Kim, Seon Jeong (Dept. of Industrial Chemistry, College of Engineering, Hanyang University) ;
  • Sung, Yong Kiel (Dept. of Chemistry, Dongguk University) ;
  • Kang, In Kyu (Dept. of Polymer Engineering, Kyungbuk National University) ;
  • Son, Tae II (Dept. of Biotechnology, Chung Ang University)
  • Received : 1993.03.06
  • Accepted : 1993.04.12
  • Published : 1993.05.01
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Abstract

Hydroxypropyl chitin(HPCH) was prepared from chitin by reacting it with propylene oxide. The formation of liquid crystalline character of HPCH was investigated using halogenated organic solvents. Solid state $^{13}C$ NMR spectra for chitin and HPCH confirmed the incorporation of hydroxypropyl moiety. The degree of substitution of HPCH was around 0.8 as detected by elemental analysis. WAXD patterns of chitin and HPCH showed that an incorporation of hydroxypropyl unit in chitin contributed to reducing the crystallinity and enhancing the solubility in organic solvents. Polarized light microscopic pictures of concentrated HPCH solution showed that HPCH formed cholesteric liquid crystalline character at about 25w/v% solution in dichloroacetic acid and 1, 2-dichloroethane. Inherent viscosity of HPCH solution in a mixed solvent showed a transient decrease.

키틴과 프로필렌 옥시드를 반응시켜 히드록시프로필 키틴(HPCH)을 얻었고 할로겐화 유기용매내에서 HPCH의 액정형성능을 관찰하였다. 키틴과 HPCH의 고체 $^{13}C$ NMR 스펙트럼 분석 결과 히드록시프로필기의 도입을 확인하였다. 원소분석결과 히드록시프로필기의 치환도는 0.8정도였다. WAXD패턴 측정결과 키틴에 히드록시프로필기가 도입됨에 따라 결정성은 감소하였고 유기용매에 대한 용해도는 증가하였다. HPCH를 디클로로아세트산과 1, 2-디클로로에탄 혼합용매에 녹여 편광현미경으로 관찰한 결과 25% 이상의 용액농도에서 콜레스테릭 액정상에서 전형적으로 관측되는 지문영역이 나타남을 알 수 있었다. 용액의 점도는 시간변화에 따라 감소함을 알 수 있었다.

Keywords

Acknowledgement

Supported by : Ministry of Education