Influence of Polymerization Process on Liquid Crystal Alignment on Polyimide with Side Chain Containing Biphenyl Unit

CHEN Sheng-liang; LIU Xiang-yang; GU Yi

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Influence of Polymerization Process on Liquid Crystal Alignment on Polyimide with Side Chain Containing Biphenyl Unit

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

- Influence of Polymerization Process on Liquid Crystal Alignment on Polyimide with Side Chain Containing Biphenyl Unit
- Chinese Journal of Liquid Crystals and Displays Vol. 24, Issue 5, Pages: 656-660(2009)
- 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,E-mail:py_39@yahoo.com.cn
- 作者简介：
- 基金信息：
- DOI：
  CLC： null
- Received：23 March 2009，
  
  Revised：02 January 1900，
  
  Published Online：30 October 2009，
  
  Published：30 October 2009
- 稿件说明：
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陈胜亮;刘向阳;顾宜. 聚合工艺对联苯侧链型聚酰亚胺薄膜取向性能的影响[J]. 液晶与显示, 2009,24(5): 656-660

CHEN Sheng-liang;LIU Xiang-yang;GU Yi. Influence of Polymerization Process on Liquid Crystal Alignment on Polyimide with Side Chain Containing Biphenyl Unit[J]. 液晶与显示, 2009,24(5): 656-660
陈胜亮;刘向阳;顾宜. 聚合工艺对联苯侧链型聚酰亚胺薄膜取向性能的影响[J]. 液晶与显示, 2009,24(5): 656-660 DOI：

CHEN Sheng-liang;LIU Xiang-yang;GU Yi. Influence of Polymerization Process on Liquid Crystal Alignment on Polyimide with Side Chain Containing Biphenyl Unit[J]. 液晶与显示, 2009,24(5): 656-660 DOI：

摘要

以4

4'二氨基二苯醚(ODA)、 3

5-二氨基苯甲酸{6- }己基)酯(C6-DABBE)、4

4'-二苯醚四羧酸二酐(ODPA) 为单体

分别采用一步法和两步法共聚合成一系列含有联苯侧链的聚酰亚胺。采用衰减全反射红外光谱(ATR-FTIR)、表面能、原子力显微镜(AFM)、光电子能谱(XPS)等测试手段对薄膜的基本性能进行了研究。通过对预倾角的测量考察了液晶分子在联苯侧链聚酰亚胺薄膜上的取向性能。结果表明

一步法和两步法合成的聚酰亚胺表面分子结构基本一致

都能使液晶分子表现出良好的取向性能;液晶分子的预倾角随着聚酰亚胺侧链含量的增加而增加;由于两步法更有利于侧链在表面富集

所以采用两步法可获得更大的预倾角。

Abstract

Polyimide(PI) is widely used as alignment layers in liquid crystal display industry

owing to their many excellent properties

such as heat resistance

dielectric properties

mechanical properties

chemical resistance

film-forming ability. One of the important parameters of alignment layers is pretilt angles of liquid crystal molecules. In this paper

a series of PIs containing biphenyl side chain polymerized from C6-DABBE/ODA/ODPA were synthesized via one-step method and two-step method. By means of ATR-FTIR

atomic force microscope (AFM)

surface energy

X-ray photoelectron spectroscopy(XPS)

the basic characters of PI films were investigated.The LC molecule alignment ability induced by polyimide alignment films and the profile of polyimide surfaces rubbed were also studied through pretilt angles.The results showed that liquid crystal on PI (C6-DABBE/ODA/ODPA) prepared by both one-step method and two-step method both could get good alignment.The pretilt angles of LC increased along with the density of side chain for higher enrichment of side chain on the surface

polyimides prepared by two-step method could show bigger pretilt angles.

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references

. 丁孟贤. 聚酰亚胺-化学、结构与性能的关系及材料 [M]. 北京:科学出版社, 2006.

. 付祥峰,帅亚,顾宜.含联苯基团侧链聚酰亚胺液晶取向膜的研究 [J]. 高分子材料科学与工程, 2006,22(3):228-230.

. Lee Y J, Choi J G, Song I K, et al. Effect of side chain structure of polyimides on a pretilt angle of liquid crystal cells [J]. Polymer, 2006 , 47:1555-1562.

. Wang D H, Shen Z H, Guo M M, et al. Synthesis and properties of polyimides containing multiple alkyl side chains [J]. Macromolecules, 2007,40:889-900.

. Lai Hua, Qin Lin, Liu Xiangyang, et al. Synthesis of novel polyimides with (tert-butyldimethylsiloxy) biphenyloxy groups and the effect of side-chains content on their properties [J]. European Polymer Journal,2008,44:3724-3731.

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. Geary J M, Goodby J W, Kmetz A R, et al. The mechanism of polymer alignment of liquid crystal materials [J].J. Appl. Phys.,1987,62(10):4100-4107.

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