Nonlinear optical spectroscopic studies of polymer surfaces for liquid crystal alignment: Photo-irradiated polyimide and rubbed polystyrene surfaces

Masahito Oh-e, Seok Cheol Hong, Y. R. Shen

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

Surface specific sum-frequency vibrational spectroscopy (SFVS) and second-harmonic generation (SHG) were used to study the structures of polymer surfaces modified by linearly polarized UV irradiation or mechanical rubbing. The spectroscopic results show that the surface anisotropy of a polyimide surface resulting from bond breaking by linearly polarized UV irradiation is extremely small compared to a rubbed surface. On a rubbed polystyrene surface, the phenyl sidegroups are well aligned by rubbing in the direction perpendicular to rubbing but tilt from the surface normal with a broad distribution.

Original languageEnglish
Pages (from-to)339/[1949]-349/[1959]
JournalMolecular Crystals and Liquid Crystals
Volume412
DOIs
Publication statusPublished - 2004
Externally publishedYes
EventProceedings of the 19th International Liquid Crystal Conference, ILCC2002 - Edinburgh, United Kingdom
Duration: 2002 Jun 302002 Jul 5

Keywords

  • Interface
  • Liquid crystal
  • Nonlinear optics
  • Polyimide
  • Sum-frequency generation
  • Surface
  • Vibrational spectroscopy

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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