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用于调频电光响应的双介晶掺杂胆甾相液晶中均匀平躺螺旋织构的聚合物稳定化

Polymer Stabilization of Uniform Lying Helix Texture in a Bimesogen-Doped Cholesteric Liquid Crystal for Frequency-Modulated Electro-Optic Responses.

作者信息

Yu Chia-Hua, Wu Po-Chang, Lee Wei

机构信息

College of Photonics, National Yang Ming Chiao Tung University, Guiren Dist., Tainan 711010, Taiwan.

Institute of Imaging and Biomedical Photonics, College of Photonics, National Yang Ming Chiao Tung University, Guiren Dist., Tainan 711010, Taiwan.

出版信息

Materials (Basel). 2022 Jan 20;15(3):771. doi: 10.3390/ma15030771.

Abstract

A polymer network (PN) can sustain the uniform lying helix (ULH) texture in a binary cholesteric liquid crystal (LC) comprising a calamitic LC and a bimesogenic LC dimer. Upon copolymerization of a bifunctional monomer with a trifunctional monomer at a concentration of 5 wt% to create the desired polymer network structure, the PN-ULH was obtained with high stability and recoverability even when cycles of helical unwinding-to-rewinding processes were induced after the electrical or thermal treatment. Utilizing dielectric spectroscopy, the flexoelectric-polarization-dominated dielectric relaxation in the PN-ULH state was characterized to determine two frequency regions, < and > , with pronounced and suppressed flexoelectric effect, respectively. It is demonstrated that the cell in the PN-ULH state can operate in the light-intensity modulation mode by the flexoelectric and dielectric effects at < and phase-shift mode by the dielectric effect at > . Moreover, varying the voltage frequency from < to > results in a frequency dispersion of transmittance analogous to that of flexoelectric-polarization-dominated dielectric relaxation. The unique combination of the bimesogen-doped cholesteric LC with a stable and recoverable PN-ULH texture is thus promising for developing a frequency-modulated electro-optic device.

摘要

聚合物网络(PN)能够在由棒状液晶和双介晶液晶二聚体组成的二元胆甾型液晶(LC)中维持均匀平躺螺旋(ULH)织构。当双官能单体与三官能单体以5 wt%的浓度共聚以形成所需的聚合物网络结构时,即使在经过电或热处理后诱导了螺旋解缠 - 再缠绕过程的循环,仍能获得具有高稳定性和可恢复性的PN - ULH。利用介电谱对PN - ULH状态下以挠曲电极化为主的介电弛豫进行了表征,确定了两个频率区域,分别为<和>,挠曲电效应在这两个区域分别表现为显著和抑制。结果表明,处于PN - ULH状态的单元可以在<时通过挠曲电和介电效应以光强度调制模式运行,在>时通过介电效应以相移模式运行。此外,将电压频率从<改变到>会导致透射率的频率色散,类似于以挠曲电极化为主的介电弛豫。因此,双介晶掺杂胆甾型液晶与稳定且可恢复的PN - ULH织构的独特组合有望用于开发调频电光器件。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1091/8837131/04cd769a1ec1/materials-15-00771-g001.jpg

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