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Surface studies of polyimide thin films via surface‐enhanced Raman scattering and second harmonic generation
Author(s) -
Ge Jason J.,
Xue Gi,
Li Fuming,
McCreight Kevin W.,
Wang ShyYeu,
Harris Frank W.,
Cheng Stephen Z. D.,
Zhuang Xiaowei,
Hong SeokChoel,
Shen Y. R.
Publication year - 1998
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/(sici)1521-3927(19981201)19:12<619::aid-marc619>3.0.co;2-z
Subject(s) - polyimide , rubbing , raman scattering , materials science , scattering , planar , anisotropy , diamine , tilt (camera) , surface (topology) , optics , second harmonic generation , raman spectroscopy , thin film , polymer chemistry , composite material , physics , nanotechnology , geometry , layer (electronics) , computer graphics (images) , computer science , laser , mathematics
Two polyimides having the same backbone chemical structure and different pendant side groups at the 2‐ and 2′‐positions of the diamine, the six methylene units capped with 4‐cyanobiphenyl end groups and trifluoromethyl, were synthesized (6FDA‐6CBO and 6FDA‐PFMB). Surface‐enhanced Raman scattering and surface optical second harmonic generation measurements show that after rubbing the major change in 6FDA‐PFMB surface appears in the orientation of the dianhydride, which was originally planar, but becomes tilted with respect to the surface plane. In the case of 6FDA‐6CBO, rubbing also causes the originally planar 4‐cyanobiphenyls to tilt away from the surface and assume an azimuthally anisotropic distribution.