Liquid-crystal alignment of rubbed polyimide films: A microscopic investigation

1996 ◽  
Vol 62 (6) ◽  
pp. 613-618 ◽  
Author(s):  
H. -M. Wu ◽  
J. -H. Tang ◽  
Q. Luo ◽  
Z. -M. Sun ◽  
Y. -M. Zhu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Microscopic Investigation ◽  
Polyimide Films ◽  
Liquid Crystal Alignment ◽  
Crystal Alignment

Nanotopology of Polyimide Films Obliquely Treated by Plasma Beam and Liquid Crystal Alignment

2009 ◽  
Vol 512 (1) ◽  
pp. 40/[1886]-47/[1893] ◽  
Author(s):  
R. Kravchuk ◽  
O. Yaroshchuk ◽  
S. Gubarev ◽  
A. Dobrovolskyy ◽  
A. Evsyukov ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Polyimide Films ◽  
Plasma Beam ◽  
Liquid Crystal Alignment ◽  
Crystal Alignment

The influence of fluorine atoms introduced into the surface of polyimide films by direct fluorination on the liquid crystal alignment

2009 ◽  
Vol 37 (1) ◽  
pp. 115-119 ◽  
Author(s):  
Xiangyang Liu ◽  
Xu Wang ◽  
Hua Lai ◽  
Shengliang Chen ◽  
Ming Li ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Polyimide Films ◽  
Liquid Crystal Alignment ◽  
Direct Fluorination ◽  
Crystal Alignment

Molecular Orientation of Polyimide Films for Liquid Crystal Alignment Studied by Infrared Dichroism

1994 ◽  
Vol 33 (Part 1, No. 11) ◽  
pp. 6273-6276 ◽  
Author(s):  
Kyoko Sawa ◽  
Ken Sumiyoshi ◽  
Yoshihiko Hirai ◽  
Kazuo Tateishi ◽  
Taibun Kamejima
Keyword(s):  
Liquid Crystal ◽  
Molecular Orientation ◽  
Polyimide Films ◽  
Liquid Crystal Alignment ◽  
Crystal Alignment ◽  
Infrared Dichroism

scholarly journals P-64: UV-Light-Modified Polyimide Films for Liquid-Crystal Alignment

1998 ◽  
Vol 29 (1) ◽  
pp. 722 ◽  
Author(s):  
S. Gong ◽  
J. Kanicki ◽  
L. Ma ◽  
J. Z. Z. Zhong
Keyword(s):  
Liquid Crystal ◽  
Uv Light ◽  
Polyimide Films ◽  
Liquid Crystal Alignment ◽  
Crystal Alignment

Ultraviolet-light Induced Liquid-Crystal Alignment on Polyimide Films

1999 ◽  
Vol 38 (Part 1, No. 10) ◽  
pp. 5996-6004 ◽  
Author(s):  
Shaoqin Gong ◽  
Jerzy Kanicki ◽  
Lan Ma ◽  
John Z. Z. Zhong
Keyword(s):  
Liquid Crystal ◽  
Ultraviolet Light ◽  
Polyimide Films ◽  
Liquid Crystal Alignment ◽  
Crystal Alignment

Mechanisms Of Liquid Crystal Alignment On Buffed Polyimide Surfaces

1994 ◽  
Vol 345 ◽  
Author(s):  
Hirotsugu Kikuchi ◽  
J. A. Logan ◽  
Do Y. Yoon
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Amic Acid ◽  
Polymer Chains ◽  
Polymer Surfaces ◽  
Polyimide Films ◽  
Force Microscopy ◽  
Liquid Crystal Alignment ◽  
Smectic C ◽  
Crystal Alignment

AbstractThe surfaces of poly(amic acid) and cured polyimide films, subjected to different buffing and cure profiles, have been examined by atomic force microscopy (AFM). The ability of these buffed polymer surfaces to align nematic and chiral smectic C liquid crystals were also investigated. These studies show that the presence of microgrooves on buffed polymer surfaces are not necessary for alignment of liquid crystals. Rather, it is concluded that the liquid crystal alignment is mainly caused by the anisotropic intermolecular interactions between liquid crystal molecules and the polymer chains oriented by buffing. For the alignment of smectics, both the degree of order and mechanical properties of polyimide films are found to be important factors.

Anisotropic Reflectivity of Rubbed Polyimide Liquid Crystal Alignment Layer

2010 ◽  
Vol 428-429 ◽  
pp. 309-316
Author(s):  
Wen Jun Zheng
Keyword(s):  
Liquid Crystal ◽  
Optical Anisotropy ◽  
Polyimide Films ◽  
Alignment Layer ◽  
Liquid Crystal Alignment ◽  
Surface Optical ◽  
Crystal Alignment ◽  
Pretilt Angle

The surface optical anisotropy of rubbed polyimide films has been detected using reflection anisotropy spectroscopy. The amplitude of the reflection anisotropy signals increases with the rubbing strength. Rubbing also causes changes in pretilt angle of liquid crystal molecules which are in contact with the rubbed polyimide. An increase in rubbing strength results in an increase in the pretilt angel. The pretilt of the liquid crystal molecules was found to linearly correlate with the amplitude of the RA signals.

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