Surface Alignment Analysis of Polyimide Liquid Crystal Vertical Alignment Films

JIANG Ying; SUN Zhen; FANG Yu-qing; WANG Ying-han

doi:10.3788/YJYXS20112601.0009

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Surface Alignment Analysis of Polyimide Liquid Crystal Vertical Alignment Films

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

- Surface Alignment Analysis of Polyimide Liquid Crystal Vertical Alignment Films
- Chinese Journal of Liquid Crystals and Displays Vol. 26, Issue 1, Pages: 9-12(2011)
- 作者机构：
  
  四川大学高分子科学与工程学院高分子材料工程国家重点实验室,四川成都,610065
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20112601.0009
  CLC： TQ323.7;TN141.9
- Received：08 April 2010，
  
  Revised：05 May 2010，
  
  Published Online：20 February 2011，
  
  Published：20 February 2011
- 稿件说明：
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姜莹, 孙振, 房玉庆, 汪映寒. 聚酰亚胺液晶垂直取向膜的表面取向分析[J]. 液晶与显示, 2011,26(1): 9-12

JIANG Ying, SUN Zhen, FANG Yu-qing, WANG Ying-han. Surface Alignment Analysis of Polyimide Liquid Crystal Vertical Alignment Films[J]. , 2011,26(1): 9-12
姜莹, 孙振, 房玉庆, 汪映寒. 聚酰亚胺液晶垂直取向膜的表面取向分析[J]. 液晶与显示, 2011,26(1): 9-12 DOI： 10.3788/YJYXS20112601.0009.

JIANG Ying, SUN Zhen, FANG Yu-qing, WANG Ying-han. Surface Alignment Analysis of Polyimide Liquid Crystal Vertical Alignment Films[J]. , 2011,26(1): 9-12 DOI： 10.3788/YJYXS20112601.0009.

摘要

采用均苯四甲酸二酐(PMDA)、4

4'-二胺基二苯甲烷(MDA)以及侧基含联苯和己基的二胺(TBCA)三元共聚制备了聚酰亚胺垂直取向剂

摩擦前后得到相同的垂直取向效果

探讨了侧链二胺TBCA的含量对聚酰亚胺取向膜垂直取向性能的影响

采用衰减全反射红外光谱(ATR-FTIR)对摩擦前后聚酰亚胺膜表面侧链的相对含量进行了对比

并运用原子力显微镜(AFM)考察了表面细微沟纹对液晶分子取向的影响。结果表明

在取向膜未经摩擦没有产生表面沟纹的情况下液晶分子也能取向

并且这类取向膜表面侧链的含量与摩擦后的含量相当。

Abstract

Polyimide (PI) was synthesized by copolymerization of PMDA

MDA and TBCA in this paper. The films prepared by PI can induce the same vertical alignment before and after rubbing. The effect of content of TBCA on the alignment property was discussed

the relative content of surface side chains was observed by the ATR-FTIR spectra of the PI films surface

and the effect of the microgrooves on the liquid crystal was investigated by atomic force microscope (AFM). The PI films without microgrooves before rubbing can align liquid crystal molecules. Moreover

the content of surface side chains of this PI films before rubbing is the same as that after rubbing.

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Keywords

references

Cai C, Lien A, Andry P S,et al.Dry vertical alignment method for multi-domain homeotropic thin-film-transistor liquid crystal displays [J].Jpn. J. Appl. Phys., 2001, 40(12):6913-6917.[2] Hwang J Y, Seo D S, Kim J H. Wide viewing angle of nematic liquid crystal using the vertical-alignment-1/6 pi cell on a rubbed polyimide surfaces [J].Jpn. J. Appl. Phys., 2001, 40(1):263-264.[3] Lee J B, Lee H K, Park J C, et al. The structural effects on the pretilt angle of alignment materials with alkylcyclohexylbenzene as a side chain in polyimides [J]. Mol. Cryst. Liq. Cryst., 2005, 439:161-172.[4] David H,Wang Z H, Shen M M.et al. Synthesis and properties of polyimides containing multiple alkyl side chains[J]. Macromolecules,2007, 40(4):889-900.[5] Arafune R,Sakamoto K,Ushioda S. Importance of rubbing-induced inclination of polyimide backbone structures for determination of the pretilt angle of liquid crystals[J].Phys. Rev. E,1998,58(5):5914-5918.[6] Lee K W, Paek S H, Lien A, et al. Microscopic molecule reorientation of alignment layer polymer surfaces induced by rubbing and its effects on LC pretilt angles [J].Macromolecules, 1996, 29(27):8894-8899.[7] Hahm S G, Lee T J, Chang T H, et al. Unusual alignment of liquid crystals on rubbed films of polyimides with fluorenyl side groups[J].Macromolecules, 2006, 39(16):5385-5392.[8] 见山幸广,仁平贵康,远藤秀幸,等.液晶取向处理剂和用该处理剂的液晶元件以及液晶的取向方法:中国,ZL99811111.2 .2001-10-24.[9] Liu Z J, Yu F F, Zhang Q, et al. Preparation and characterization of a novel polyimide liquid crystal vertical alignment layer[J]. Eur. Polym. J.,2008,44(8):2718-2727.

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