侧链密度对聚酰亚胺取向膜性能的影响

刘明; 孙振; 汪映寒

doi:10.3788/YJYXS20132801.0019

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侧链密度对聚酰亚胺取向膜性能的影响

材料物理和化学 | 更新时间：2020-08-12

- 侧链密度对聚酰亚胺取向膜性能的影响
- Effect of Side Chain Density of Polyimides on Properties of Liquid Crystal Alignment Film
- 液晶与显示 2013年28卷第1期页码：19-24
- 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：
  
  国家自然科学基金(No. 50973067, 51173115, 21172161)();教育部留学回国人员科研启动基金(No. 20071108-18-12)();博
- DOI：10.3788/YJYXS20132801.0019
  中图分类号： O753+.2
- 收稿日期：2012-09-28，
  
  修回日期：2012-10-25，
  
  纸质出版日期：2013-02-15
- 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℃.

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Keywords

references

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