Ultraviolet Dye Induced Broadband Reflection in Cholesteric Liquid Crystals Polymer Film

LI Fa-sheng; WANG Lei; QI Lin; LIU Xiao-chen; MAO Wei-min

doi:10.3788/YJYXS20112605.0573

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Ultraviolet Dye Induced Broadband Reflection in Cholesteric Liquid Crystals Polymer Film

Material Physics & Chemistry | 更新时间：2020-08-12

- Ultraviolet Dye Induced Broadband Reflection in Cholesteric Liquid Crystals Polymer Film
- Chinese Journal of Liquid Crystals and Displays Vol. 26, Issue 5, Pages: 573-576(2011)
- 作者机构：
  
  1. 北京科技大学材料科学与工程学院材料物理与化学系北京,100083
  2. 大连医科大学化学教研室,大连 116044
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20112605.0573
  CLC： O753+.2
- Received：22 April 2011，
  
  Revised：02 May 2011，
  
  Published Online：20 October 2011，
  
  Published：20 October 2011
- 稿件说明：
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李发胜, 王磊, 齐琳, 刘晓晨, 毛卫民. 紫外吸收染料诱导的具有宽波反射特性的胆甾相液晶聚合物薄膜[J]. 液晶与显示, 2011,26(5): 573-576

LI Fa-sheng, WANG Lei, QI Lin, LIU Xiao-chen, MAO Wei-min. Ultraviolet Dye Induced Broadband Reflection in Cholesteric Liquid Crystals Polymer Film[J]. , 2011,26(5): 573-576
李发胜, 王磊, 齐琳, 刘晓晨, 毛卫民. 紫外吸收染料诱导的具有宽波反射特性的胆甾相液晶聚合物薄膜[J]. 液晶与显示, 2011,26(5): 573-576 DOI： 10.3788/YJYXS20112605.0573.

LI Fa-sheng, WANG Lei, QI Lin, LIU Xiao-chen, MAO Wei-min. Ultraviolet Dye Induced Broadband Reflection in Cholesteric Liquid Crystals Polymer Film[J]. , 2011,26(5): 573-576 DOI： 10.3788/YJYXS20112605.0573.

摘要

利用紫外光吸收染料诱导胆甾相液晶体系形成螺距梯度

制备了具有宽波反射特性的胆甾相液晶聚合物薄膜。研究表明

由于紫外光吸收染料的存在

在紫外光诱导聚合的过程中

在复合材料中将形成紫外光强度梯度

进而形成手性单体的浓度梯度

最终制备了可反射可见光区红蓝绿三色光的胆甾相液晶聚合物薄膜。扫描电镜测试结果表明

胆甾相液晶聚合物薄膜的断面形貌具有螺距的梯度分布。该类材料在可调控光的智能玻璃和光学元器件等领域具有应用潜力。

Abstract

A cholesteric liquid crystals (Ch-LCs) polymer film with broadband reflection was fabricated induced by UV Absorbing Dye (UVAD). The results demonstrated that the gradient of UV light intensity forms cross the polymer film by adding the UV-absorbing dye to the Ch-LCs acrylate mixture

resulting that the pitch gradient forms in the Ch-LCs polymer film. After UV irradia- tion

a UVAD doped Ch-LC film can reflect incident light with the bandwidth over the visible light spectrum. The Ch-LCs polymer film with broadband reflection may be applied in at smart windows for the control of solar light and optical functional films.

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references

Wu S T, Yang D K. Reflective Liquid Crystal Display [M]. Singapore: Wiley, 2001: 1-34.[2] 黄维, 边震宇, 肖久梅,等. 具有宽波反射特性的手征向列相液晶的研究进展 [J]. 液晶与显示, 2009,24(3):322-332.[3] Kitzerow H S, Bahr C. Chirality in Liquid Crystals [M]. New York:Springer,2001: 56.[4] Broer D J, Lub J, Mol G N. Wide-band reflective polarizers from cholesteric polymer networks with a pitch gradient [J]. Nature, 1995, 378(6556): 467-469.[5] Hikmet R A M, Kemperman H. Electrically switchable mirrors and optical components made from liquid-crystal gels [J]. Nature, 1998, 392: 476-479.[6] Mitov M, Boudet A, Sopena P. From selective to wide-band light reflection: a simple thermal diffusion in a glassy cholesteric liquid crystal [J]. European Physics Journal B, 1999, 8(3):327-330.[7] Boudet A, Binet C, Mitov M, et al. Microstructure of variable pitch cholesteric films and its relationship with the optical properties [J]. European Physics Journal E, 2000, 2(3): 247-253.[8] Yang H, Mishima K, Matsuyama K, et al. Thermally bandwidth-controllable reflective polarizers from (polymer network/liquid crystal/chiral dopant) composites [J]. Appl. Phys. Lett., 2003, 82(15): 2407-2409.[9] Relaix S, Bourgerette C, Mitov M. Broadband reflective liquid crystalline gels due to the ultraviolet light screening made by the liquid crystal [J]. Appl. Phys. Lett., 2006, 89(25):251907(1-3).[10] Broer D J, Boven J, Mol G N. In-situ photopolymerization of oriented liquid-crystalline acrylates. Oriented polymer networks from a mesogenic diacrylate [J]. Makromol. Chem., 1989, 90: 2255-2268.[11] Guo J B, Sun J, Li K X, et al.Reflectance properties of polymer-stabilised cholesteric liquid crystals cells with cholesteryl compounds of different functionality [J]. Liq. Cryst.,2008, 35(1):87-97.[12] Idenistu Kosam Co. Ltd.Ferroelectronic liquid crystal polymer: USA,4844835 . 1989-07-04.

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