STRUCTURE PROPERTY RELATIONSHIPS FOR THE THERMAL PHASE-BEHAVIOR OF DISCOTIC LIQUID-CRYSTALS - THE EFFECT OF BRANCHING AND UNSATURATION IN THE SIDE-CHAINS OF DISK-LIKE MOLECULES

被引：72

作者：

COLLARD, DM ^{[1
]}

LILLYA, CP ^{[1
]}

机构：

[1] UNIV MASSACHUSETTS,DEPT CHEM,AMHERST,MA 01003

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 1991年 / 113卷 / 23期

关键词：

D O I：

10.1021/ja00023a001

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The crystal-to-discotic liquid-crystalline phase transition associated with disklike molecules can be explained in terms of a disordering of the side chains. Unstacking of the columnar arrangement takes place at the clearing transition. introduction of branch points into the side chains of hexakis(alkanoyloxy)benzenes and 1,2,3,4,5,6-all-trans-substituted cyclohexanes widens the temperature range over which the columnar mesophase is stable primarily by lowering the crystal-discotic transition temperature. Maximum depression of this transition occurs when this branch point resides near the middle of the side chain. The effect of unsaturation in the middle of the side chains is to increase the disordering temperature. If the side chain remains ordered up to the temperature at which the cores unstack, no mesophase is observed.

引用

页码：8577 / 8583

页数：7

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