Spontaneous polarisation due to flexoelectric effect in liquid crystalline elastomers prepared by cross-linking under splay distortion
Spontaneous polarisation due to flexoelectric effect in liquid crystalline elastomers prepared by cross-linking under splay distortion
复制标题
在张开变形下交联制备的液晶弹性体中由于挠曲电效应而产生的自发极化
DOI：
10.1080/02678292.2022.2095676
复制
发表时间：
2022
期刊：
影响因子：
2.2
通讯作者：
Seiryu KOMESU and Katsumi YAMADA
中科院分区：
文献类型：
--
作者：
Kazuyuki HIRAOKA;Toshio ISHIHARA;Hiroyuki MINAMI;Shiori TAIRA;Seiryu KOMESU and Katsumi YAMADA
研究了含楔形液晶基元的液晶弹性体的挠曲电极化。挠曲电极化固定在弹性体中，所述弹性体在具有展曲变形的单轴变形下交联。X-射线衍射表明，即使在各向同性相的温度范围内，取向度也部分保持在S = 0.2左右，暂时称为假各向同性相。在展曲变形液晶弹性体中，由于挠曲电效应引起的极化引起的电荷估计为−809 pC/mm 2，而在单轴和均匀排列的弹性体中几乎没有检测到电荷。我们初步得出的结论是，由于挠曲电效应的宏观极化出现，并固定在液晶弹性体下的splay扭曲交联。
Flexoelectric polarisation in liquid crystalline elastomers with wedge-shaped mesogens was investigated. Flexoelectric polarisation was fixed in the elastomers that were cross-linked under uniaxial deformation with splay distortion. X-ray diffractometry revealed that the orientational order partially remained at aboutS= 0.2 even in the temperature region of the isotropic phase designated tentatively as the pseudo-isotropic phase. The electric charge caused by polarisation due to the flexoelectric effect was estimated to be −809 pC/mm2in the splay distorted liquid crystalline elastomers, whereas almost no electric charge was detected in the uniaxially and uniformly aligned elastomers. We tentatively conclude that the macroscopic polarisation due to flexoelectric effect emerged and was fixed in the liquid crystalline elastomers by cross-linking under splay distortion.