Thermal and Ferroelectric Properties of Novel Ferroelectric Liquid Crystals Containing α-Methylcinnamoyl Moiety in the Core Structure
作者:Jun Nakauchi、Yoshitaka Kageyama
DOI:10.1246/bcsj.61.2573
日期:1988.7
Six homologous series of novel ferroelectric liquid crystals containing α-methylcinnamoyl moiety in the core structure:(Remark: Graphics omitted.)(IA: k=1, l=1, (Remark: Graphics omitted.), n=8–16; IB: k=1, l=1, (Remark: Graphics omitted.), n=8–16; IIA: k=1, l=2, (Remark: Graphics omitted.), n=9–16; IIB: k=1, l=2, (Remark: Graphics omitted.), n=8–14, IIIA: k=2, l=1, (Remark: Graphics omitted.), n=9–16; IIIB: k=2, l=1, (Remark: Graphics omitted.), n=9–16) have been synthesized and their thermal and ferroelectric properties have been investigated. The mesomorphic transition temperatures and the spontaneous polarization for the homologous series (IA, IB, IIA, IIB, IIIA, and IIIB) depend on the core structure, the chiral group, and the terminal alkoxyl chain length. These homologous series show the chiral smectic C phase over wide temperature ranges including room temperature and the values of their maximum spontaneous polarization are in the range of 30 to 800 μCm−2. The thermal stability of the mesophase and the magnitude of the spontaneous polarization have been discussed from the view point of the molecular structure and the local molecular interactions.
含有位于核心结构的α-甲基肉桂酰基团的新型铁电液晶的六个同系物系列:(备注:图表省略)(IA:k=1,l=1,(备注:图表省略),n=8-16;IB:k=1,l=1,(备注:图表省略),n=8-16;IIA:k=1,l=2,(备注:图表省略),n=9-16;IIB:k=1,l=2,(备注:图表省略),n=8-14,IIIA:k=2,l=1,(备注:图表省略),n=9-16;IIIB:k=2,l=1,(备注:图表省略),n=9-16)已合成,并研究了它们的热性能和铁电性质。液晶态转变温度和同系物系列(IA,IB,IIA,IIB,IIIA和IIIB)的自发极化依赖于核心结构、手性基团和末端烷氧基链长度。这些同系物系列显示出包括室温在内的广泛温度范围内的手性向列相,它们的自发极化最大值在30到800 μCm^-2范围内。从分子结构和局部分子相互作用的角度讨论了介晶相的热稳定性和自发极化的大小。