Effect of Side Chain Density of Polyimides on Properties of Liquid Crystal Alignment Film

LIU Ming; SUN Zhen; WANG Ying-han

doi:10.3788/YJYXS20132801.0019

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Effect of Side Chain Density of Polyimides on Properties of Liquid Crystal Alignment Film

更新时间：2020-08-12

- Effect of Side Chain Density of Polyimides on Properties of Liquid Crystal Alignment Film
- Chinese Journal of Liquid Crystals and Displays Vol. 28, Issue 1, Pages: 19-24(2013)
- 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：
  
  Research Fund for the Doctoral Program of High Education of China(No.20110181110030)
- DOI：10.3788/YJYXS20132801.0019
  CLC： O753+.2
- Received：28 September 2012，
  
  Revised：25 October 2012，
  
  Published：15 February 2013
- 稿件说明：
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刘明, 孙振, 汪映寒. 侧链密度对聚酰亚胺取向膜性能的影响[J]. 液晶与显示, 2013,(1): 19-24

LIU Ming, SUN Zhen, WANG Ying-han. Effect of Side Chain Density of Polyimides on Properties of Liquid Crystal Alignment Film[J]. , 2013,(1): 19-24
刘明, 孙振, 汪映寒. 侧链密度对聚酰亚胺取向膜性能的影响[J]. 液晶与显示, 2013,(1): 19-24 DOI： 10.3788/YJYXS20132801.0019.

LIU Ming, SUN Zhen, WANG Ying-han. Effect of Side Chain Density of Polyimides on Properties of Liquid Crystal Alignment Film[J]. , 2013,(1): 19-24 DOI： 10.3788/YJYXS20132801.0019.

摘要

成功地合成了二胺单体十二烷氧基苯-4'

4″-二氨基三苯胺(DPDTA)

并用此单体与3

3'-二甲基-4

4'-二氨基二苯甲烷(DMMDA)和二苯醚四羧酸二酐(ODPA)共缩聚

采用低温缩聚-热酰亚胺化、通过调节共聚物组成制备了2种聚酰亚胺(PI)。利用FT-IR、NMR、UV-Vis 与DSC 等手段对合成二胺单体及PI进行了结构表征和性能测试。研究了其取向性能、透光性能和耐热性能。结果表明

在摩擦前

含10% DPDTA的PI不能诱导液晶分子取向

含25% DPDTA的PI能诱导液晶分子垂直取向

预倾角可达89.6°。而摩擦后

两种PI都能使液晶分子平行取向

预倾角分别为1.8°和2.4°。两种PI膜在500~800 nm区域透光率都在80%以上

玻璃化温度都在230℃以上。

Abstract

4-dodecyloxy-phenyl-4'

4″-diaminotriphenylamine (DPDTA) containing triphenylamine were successfully synthesized. Polyimides (PIs) containing triphenylamine units in the main chain were synthesized with the co-condensation of DMMDA

DPDTA and aromatic dianhydride 4

4'- oxydiphthalic anhydride (ODPA) by thermal imidization. The structures of the PIs were confirmed by FT-IR. The alignment behavior of PIs as liquid crystal alignment layers was also examined with polarized optical micrograph (POM). The properties of the PIs were characterized by TGA

UV-Vis and DSC

etc

. It was found that side chain density of PIs had important influence on properties of liquid crystal alignment film. Before rubbing

PI containing 25% DPDTA could induce uniform vertical alignment and a pretilt angle of 89.7°. The liquid crystal was not aligned on the surface of PI film which contained 10% DPDTA without the rubbing treatment. After the rubbing process

the pretilt angle of liquid crystal was 2.4

when PI film contained 25% DPDTA and the pretilt angle of liquid crystal was 1.8°

when PI contained 10% DPDTA. The transmittances of the PIs in 500~800 nm wavelengths are more than 80%

and their glass transition temperatures are above 230℃.

关键词

Keywords

references

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Related Institution

四川大学高分子科学与工程学院高分子材料与工程国家重点实验室

Cell PI Section, Chongqing BOE Optoelectronics Technology Co., Ltd.

State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China

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

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