2B15 中分子液晶からなるコレステリックガラスの光学的・熱的特性 (1)

概要

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Dicholesteryl esters of diacetylenedicaboxylic acid with different length of methylene linkages are synthesized. Compounds with (CH2)n (n=2,4,5,6,7,8,10) showed a cholesteric phase. Phase transition temperatures from isotropic phase to cholesteric phase (to crystalline phase in the case of n=3,5) showed an odd-even effect of the number of (CH2). By rapid cooling from the cholesteric phase to 0 ℃, the compounds were solidified keeping the cholesteric colors (choresteric glass). The colors of the choleseric glass were changed by changing the temperature at which rapid cooling starts. The thermal stability of the cholesteric solid also showed an odd-even effect of the number of (CH2). The effect can be explained by the difference of stable structures of the molecules and the strength of week inter-molecular interactions via carbonyl groups which is observed in the FT-IR spactra.
日本液晶学会の論文
1998-10-12