Surface studies of polyimide thin films via surface-enhanced Raman scattering and second harmonic generation

Jason J. Ge, Gi Xue, Fuming Li, Kevin W. McCreight, Shy Yeu Wang, Frank W. Harris, Stephen Z.D. Cheng, Xiaowei Zhuang, Seok Choel Hong, Y. R. Shen

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)619-623
Number of pages5
JournalMacromolecular Rapid Communications
Volume19
Issue number12
DOIs
Publication statusPublished - 1998 Dec
Externally publishedYes

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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