Liquid crystalline dimers containing a cholesteryl group: Chiral smectic phases, and re-entrant TGBA* phase

被引：5
作者：
Huang, Haozhou [1 ]
Cong, Yuehua [1 ]
Du, An [1 ]
Hu, Bing [1 ]
Li, Jun [1 ]
Zhang, Baoyan [1 ]
机构：
[1] Northeastern Univ, Coll Sci, Shenyang, Peoples R China
来源：
JOURNAL OF MOLECULAR LIQUIDS | 2022年 / 346卷
基金：
中国国家自然科学基金;
关键词：
Twist grain boundary phase; Chiral liquid crystal; Phase transition; Re-entrancy; MESOMORPHIC PROPERTIES; THERMAL-BEHAVIOR; OLIGOMERS; SERIES; TGB(A);
D O I：
10.1016/j.molliq.2021.117920
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：
A new series of liquid crystalline dimers containing a cholesteryl group were synthesized, exhibiting multiple mesophases including chiral smectic phases (SmX*, SmC* and SmA*), twist grain boundary phases (TGBA* and TGBC*), and chiral nematic phase (N*). Re-entrant phenomenon occurs, which is rarely reported for pure matters of dimeric liquid crystals. The chemical structure and liquid crystal properties of the dimers were characterized by FTIR, H-1 NMR, DSC, POM and XRD. It was in evidence that the length and the parity of the spacer and the length of the terminal tail were the decisive factors of the mesophase behaviours. (C) 2021 Elsevier B.V. All rights reserved.
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页数：14
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