NEXAFS Study on Photoalignment of Liquid Crystalline Polymeric Films

Polarization-dependent near-edge X-ray absorption fine structure (NEXAFS) measurement is performed to investigate orientation structures of the near-surface of the reoriented photo-cross-linkable liquid crystalline polymer (PMCB6M) films, which are applicable to liquid crystal (LC) alignment layer....

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Bibliographic Details
Published in:Molecular Crystals and Liquid Crystals 2014-09, Vol.601 (1), p.49-56
Main Authors: Kawatsuki, Nobuhiro, Inada, Yonosuke, Goto, Kohei, Kondo, Mizuho, Haruyama, Yuichi, Matsui, Shinji
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Crystals
Fine structure
LC alignment
Liquid crystal polymers
Liquid crystals
Measurement
NEXAFS
Orientation
Photoalignment
photoinduced orientation
Rings (mathematics)
Spectrum analysis
Surface chemistry
Three dimensional
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Summary:Polarization-dependent near-edge X-ray absorption fine structure (NEXAFS) measurement is performed to investigate orientation structures of the near-surface of the reoriented photo-cross-linkable liquid crystalline polymer (PMCB6M) films, which are applicable to liquid crystal (LC) alignment layer. The 3D orientation parameter at the near-surface of the reoriented PMCB6M film is ∼0.7, which is similar to the results obtained by a polarization absorption spectroscopy that evaluates the reorientation behavior in bulk. Furthermore, more preferable in-plane orientation is observed at the nearest surface of the film, and the phenyl rings in the reoriented mesogenic side groups show slightly perpendicular orientation to the surface normal.
ISSN:1542-1406
1563-5287
1527-1943
DOI:10.1080/15421406.2014.940492