Earticle

초록

영어

The oscillation in the entropy change at the NI(nematic-isotropic) phase transition temperature becomes less distinct when the linking group is replaced by the carbonate. In our previous work, we have suggested that such characteristics arise from the geometrical arrangement of the linkage. In this work, deuterium NMR studies have been carrier out for a series of carbonate-type dimer liquid crystals MCOC(O)O(CH2)OC(O)CN(CBC-c, c=5.6) to elucidate the conformational characteristics of the spacer in the nematic phase. The H-NMR spectra were recorded on a JEOL GSX-500 apparatus by using deuterium labelled CBC-n. Following the previous treatment, the single-ordering-matrix model was adopted, in which the molecular axis was defined along the line connecting the centers of the terminal mesogenic cores. Conformer fractions were estimated by simulation so as to reproduce the observed NMR profile. Under a nematic constraint the conformers should be restricted to a certain portion of all the allowed conformations of the spacer in the free stats. Hence the calculations were carried out for an ensemble of conformer having the angle between the mesogenic core and the molecular axis smaller than a certain valur Successful results were as follows:

목차

Abstract
 1. 서론
 2. 실험
  2-1. 시료 및 시약
  2-2. 실험방법
 3. 결과 및 고찰
  3-1. 실험결과
  3-2. 젖은 면의 단위 면적당 액량과 요면의 직경 및 곡율반경에 대한 해석
 4. 결론
 참고문헌

저자

• 최정병 [ Jung-Byung Choi | 인천전문대학 인쇄공학과 ]
• 김종원 [ Kim, Jong Won | 인천전문대학 인쇄공학과 ]
• 宋玄鎬 [ 송현호 | 시립인천전문대학 인쇄과 ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국인쇄학회지 [JOURNAL OF THE KOREAN GRAPHIC ARTS COMMUNICATION SOCIETY]

• 간기

  연간

• pISSN

  1226-1149

• 수록기간

  1983~2025

• 십진분류

  KDC 586 DDC 686