Effect of the Different Structure of the Chiral Core on Phase Behaviors of Cholesteric Star-Shaped Liquid Crystals
In the present work, a ester of glucose (a) with 4-(4-(ethoxybenzoyloxy) phenoxy) -6-oxohexanoic acid side–arms has been synthesized. Compared with b and c, reported previously, a had the same side-arms but different chiral core. The phase behaviors of three star-shaped liquid crystals (a, b, c) have been compared and studied, and the effect of the different structure of chiral core on the phase behaviors of the star-shaped liquid crystals has been discussed. a, b and c displayed cholesteric phase, unlike the nematic side arm. a, b and c were all laevo-rotationary, unlike their parent cores. The melting temperature of a, b and c decreased with the increase of the sugar ring of the chiral core. The mesomorphic region of a on cooling cycle was wider than that on heating cycle. For b and c, the case was similar.
Jinglong Bu, Pengcheng Wang, Liqun Ai, Xiaoming Sang, Yungang Li
M. Tian et al., "Effect of the Different Structure of the Chiral Core on Phase Behaviors of Cholesteric Star-Shaped Liquid Crystals", Advanced Materials Research, Vols. 287-290, pp. 654-657, 2011