화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of the Korean Industrial and Engineering Chemistry, Vol.18, No.5, 475-482, October, 2007
Export Citation
글루코오스 펜타(콜레스테릴옥시카보닐)알카노에이트들의 열방성 액정 특성
Thermotropic Liquid Crystalline Properties of Glucose Penta(cholesteryloxycarbonyl)alkanoates
정승용, 마영대†
  • 단국대학교 고분자공학과
Seung-Yong Jeong, and Yung Dae Ma†
  • Department of Polymer Science and Engineering, Dankook University, Gyeonggi 448-701, Korea
E-mail:
초록
글루코오스 펜타(콜레스테릴옥시카보닐)알카노에이트들(CAGLn, n = 2∼8, 10, 스페이서 중의 메틸렌 단위들의 수)의 열 및 광학 특성을 검토하였다. 모든 CAGLn은 좌측방향의 나선구조를 지닌 단방성 콜레스테릭 상들을 형성하였다. n이 2 혹은 10인 CAGLn은 3 ≤ n ≤ 8인 CAGLn과 달리 콜레스테릭 상의 전 구간에서 반사색깔을 나타내지 않았다. 이러한 사실은 콜레스테릴 그룹에 의한 나선의 비틀림력은 콜레스테릴 그룹과 글루코오스 사슬을 연결하는 스페이서의 길이에 민감하게 의존함을 시사한다. 액체 상에서 콜레스테릭 상으로의 전이온도(Tic)는 n이 증가함에 낮아지며 홀수-짝수 효과를 나타내지 않았다. Tic에서의 엔트로피와 n을 도시한 그림상에는 n = 7에서 급격한 엔트로피의 감소가 관찰되었다. 3 ≤ n ≤ 8인 CAGLn의 광학피치들(λm’ s)은 온도가 상승함에 따라 감소하였다. 그러나 유도체들의 λm의 온도의존성은 n에 현저하게 의존하였다. CAGLn에서 관찰되는 전이 특성들과 λm의 온도의존성을 콜레스테릴 그룹들의 배열과 분자의 입체형태의 차이의 견지에서 검토하였다.
The thermal and optical properties of glucose penta(cholesteryloxycarbonyl)alkanoates (CAGLn, n = 2∼8, 10, the number of methylene units in the spacer) were investigated. All the CAGLn formed monotropic cholesteric phases with left-handed helical structures. CAGLn with n = 2 or 10, in contrast with CAGLn with 3 ≤ n ≤8, did not display reflection colors over the full cholesteric range, suggesting that the helical twisting power of the cholesteryl group highly depends on the length of the spacer joining the cholesteryl group to the glucose chain. The isotropic-cholesteric transition point (Tic) decreased with increasing n and showed no odd-even effect. The plot of transition entropy at Tic against n had a sharp negative inflection at n = 7. The optical pitches (λm’ s) of CAGLn with 3 ≤ n ≤ 8 decreased with increasing temperature. However, the temperature dependence of the λm of the derivatives exhibited pronounced dependence on n. The transitional properties and the temperature dependence of the λm observed for CAGLn were discussed in terms of the differences in arrangement of the cholesteryl groups and the conformation of the molecules.
Keywords:glucose;cholesterol;spacer length;optical pitch;helical sense
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