UV stability of liquid crystals containing tolane group

WANG Ming-xia; GUI Li-hong; FENG Jing-yi; ZAI Ya-meng; WANG Yong-qing; ZHANG Guan-chao; LI

doi:10.3788/YJYXS20153004.0571

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UV stability of liquid crystals containing tolane group

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

- UV stability of liquid crystals containing tolane group
- Chinese Journal of Liquid Crystals and Displays Vol. 30, Issue 4, Pages: 571-575(2015)
- 作者机构：
  
  1. 石家庄诚志永华显示材料有限公司,河北石家庄,050091
  2. 河北省平板显示材料工程技术研究中心,河北石家庄,050091
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20153004.0571
  CLC： TN27;TN104.3
- Received：22 October 2014，
  
  Revised：29 December 2014，
  
  Published Online：30 December 2014，
  
  Published：05 August 2015
- 稿件说明：
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王明霞, 贵丽红, 丰景义, 宰亚孟, 王永青, 张冠超, 李锐, 熊会茹. 联苯乙炔类液晶单体的紫外稳定性研究[J]. 液晶与显示, 2015,30(4): 571-575

WANG Ming-xia, GUI Li-hong, FENG Jing-yi, ZAI Ya-meng, WANG Yong-qing, ZHANG Guan-chao, LI Rui, XIONG Hui-ru. UV stability of liquid crystals containing tolane group[J]. , 2015,30(4): 571-575
王明霞, 贵丽红, 丰景义, 宰亚孟, 王永青, 张冠超, 李锐, 熊会茹. 联苯乙炔类液晶单体的紫外稳定性研究[J]. 液晶与显示, 2015,30(4): 571-575 DOI： 10.3788/YJYXS20153004.0571.

WANG Ming-xia, GUI Li-hong, FENG Jing-yi, ZAI Ya-meng, WANG Yong-qing, ZHANG Guan-chao, LI Rui, XIONG Hui-ru. UV stability of liquid crystals containing tolane group[J]. , 2015,30(4): 571-575 DOI： 10.3788/YJYXS20153004.0571.

摘要

对联苯乙炔类液晶单体的紫外稳定性进行了研究。实验数据显示:经紫外照射200 min后

液晶的阈值电压降低

折射率减小。液晶化合物的UV降解不仅与吸收波长有关

而且还与分子结构有关。本文分析了末端官能基团以及连接基团对此类单体紫外稳定性的影响:联苯乙炔与末端基团为NCS官能团连接的化合物的UV稳定性要优于与CN连接的化合物;并且当以1

4-环己基作为连接基团时化合物的UV稳定性要好于酯基(-COO-)作为连接基团和没有连接基团的化合物。

Abstract

The UV stability of liquid crystal compounds containing tolane group was studied.It showed that the threshold voltage and birefringence of the liquid crystal decreased after 200 minutes of UV exposure. And it indicated that UV degradation of the liquid crystal depended on not only the absorption wavelength but also the detailed molecular constituents.The UV stability of liquid crystal with different terminal groups and linking groups were analyzed.The measured data showed that the diphenyl acetylene compounds with NCS terminal group exhibited a better UV stability than those with CN terminal group.The compounds with 1

4-cyclohexyl linking group were better than those with -COO- linking group or with none linking group.

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references

Greubel W, Wolff U, Kruger H.Electic field induced texture changes in certain nematic/cholesteric liquid crystal mixtures [J].Mol.Cryst.Liq.Cryst., 1973, 24(1-2): 103-111.[2] Doane J W, Vaz N A, Wu B G, et al. Field controlled light scattering from nematic microdroplets [J].Appl.Phys.Lett., 1986, 48(4): 269-271.[3] Yang D K, West J L, Chien L C, et al. Control of reflectivity and bistability in displays using cholesteric liquid crystals [J].J.Appl.Phys., 1994, 76(2): 1331-1333.[4] 贵丽红,丰景义,史子谦,等. 向列相液晶旋转黏度测试方法的研究 [J]. 液晶与显示, 2013,28(4): 527-533. Gui L H, Feng J Y, Shi Z Q, et al. Method of measuring nematic LC rotational viscosity [J].Chinese Journal of Liquid Crystals and Displays,2013, 28(4): 527-533.(in Chinese)[5] Tarumi K, Finkenzeller U, Schuler B.Dynamic behavior of twisted nematic liquid crystals [J].Jpn.J.Appl.Phys., 1992, 31(1): 2829-2836.[6] Gooch C H, Tarry H A.The optical properties of twisted nematic liquid crystal structures with twist angles≤90 degrees [J].J.Phys.D: Appl.Phys., 1975, 8(13): 1575-1584.[7] Wu S T, Efron U, Hess L V.Infrared birefringence of liquid crystals [J].Appl.Phys.Lett., 1984, 44(11):1033-1035.[8] 史子谦,丰景义,贵丽红,等. 高折射率液晶化合物与液晶混合物 [J]. 液晶与显示, 2013,28(3): 310-314. Shi Z Q,Feng J Y, Gui L H, et al. High birefringence LC compounds and LC mixtures [J].Chinese Journal of Liquid Crystals and Displays, 2013, 28(3): 310-314.(in Chinese)[9] Wu S T, Ramos E.Polarized UV spectroscopy of conjugated liquid crystals [J].J.Appl.Phys.,1990, 68(1):78-85.

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