Mesomorphic and Dielectric Properties of the p-n-Hexyloxybenzoic Acid-p-n-Heptyloxybenzoic Acid Liquid Crystal System

被引：11
|
作者：
Nosikova, L. A. [1 ]
Kudryashova, Z. A. [1 ]
Iskhakova, L. D. [2 ]
Syrbu, S. A. [3 ]
机构：
[1] Lomonosov State Acad Fine Chem Technol, Moscow 117571, Russia
[2] Russian Acad Sci, Res Ctr Fiber Opt, Moscow, Russia
[3] Ivanovo State Univ, Ivanovo 153377, Russia
来源：
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A | 2008年 / 82卷 / 12期
关键词：
D O I：
10.1134/S0036024408120169
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The p-n-hexyloxybenzoic acid (I)-p-n-heptyloxybenzoic acid (II) system was investigated by thermal and X-ray phase analyses and dielcometry. Solid solutions of three types were found in the low-temperature region of the system, namely, solid solution based on I ( up to 15 mol % II); solid solution based on a compound with the equimolar ratio of the components (gamma); and solid solution based on II (> 15 mol % II). The range of the two-phase equilibrium (N + I) was 2 degrees-4 degrees; a continuous nematic solution ( N) formed in the system. The temperature and composition dependences of dielectric anisotropy Delta epsilon were characterized. The gamma compound showed negative dielectric anisotropy, Delta epsilon = -1.4, which was constant over the whole temperature range of the nematic phase.
引用
收藏
页码：2065 / 2068
页数：4
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