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Optical anisotropy of flexible polyimide thin films

Published online by Cambridge University Press:  31 January 2011

Baozhong Li ,
Tianbai He ,
Mengxian Ding ,
Ping Zhang ,
Fubin Gao  and
Feng Jing
Baozhong Li
Affiliation:
Polymer Physics Laboratory, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
Tianbai He*
Affiliation:
Polymer Physics Laboratory, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
Mengxian Ding
Affiliation:
Polymer Physics Laboratory, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
Ping Zhang
Affiliation:
Changchun Institute of Physics, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
Fubin Gao
Affiliation:
Changchun Institute of Physics, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
Feng Jing
Affiliation:
Changchun Institute of Physics, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
*
a) Author to whom all correspondence should be addressed.tbhe@ns.ciac.ac.cn.
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Abstract

Optical anisotropy of thin films of an organo-soluble flexible polyimide based on 1,4-bis(3,4-dicarboxyphenoxy) benzene dianhydride (HQDPA) and 2,2-dimethyl-4,4′-methylene dianiline (DMMDA) was detected by a prism-coupler technique. A mechanism is proposed, based on the model of gel film collapse. The degrees of optical anisotropy of the thin films were evaluated via the level of negative birefringence. The residual solvent in the films lessens the levels of negative birefringence so that the residual solvent must be evacuated. The levels of negative birefringence are independent on the solid content of the initial solution, but dependent on the thickness of the films. For a film of 16 μm thick, zero birefringence was achieved, postulated from the dependence of negative birefringence on the thickness of thin films. The relationship between the optical anisotropy and solution properties shows that the degrees of optical anisotropy of thin films on the same scale of thickness depend on macromolecular sizes in their dilute solutions.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 5 , May 1998 , pp. 1368 - 1372
Copyright
Copyright © Materials Research Society 1998

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