Surface anisotropy of polyimide film irradiated with linearly polarized ultraviolet light
作者:
K. Sakamoto,
K. Usami,
M. Watanabe,
R. Arafune,
S. Ushioda,
期刊:
Applied Physics Letters
(AIP Available online 1998)
卷期:
Volume 72,
issue 15
页码: 1832-1834
ISSN:0003-6951
年代: 1998
DOI:10.1063/1.121198
出版商: AIP
数据来源: AIP
摘要:
Using polarized infrared (IR) absorption, we have investigated the surface anisotropy of a poly [4, 4′-oxydiphenylene-pyromellitimide] (PMDA-ODA) film that arises from anisotropic decomposition of the polyimide chain during irradiation with linearly polarized ultraviolet (LPUV) light. To monitor the surface anisotropy, we designed the sample structure so that the polyimide films decomposed uniformly over the entire film thickness. The surface anisotropy has a maximum at an irradiation energy of 105J/cm2.For PMDA-ODA, the maximum surface anisotropy is significantly smaller than the surface anisotropy generated by rubbing. By analyzing the irradiation energy dependence of an IR absorption band, we found that the decomposition rate of the polyimide chain oriented parallel to the polarization direction of the LPUV light is greater only by ∼23&percent; than that oriented perpendicular to it. This is the reason for the small surface anisotropy induced by the LPUV light irradiation. ©1998 American Institute of Physics.
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