Study of the molecular orientation of steroidal side chains at polyimide surfaces using sum frequency generation vibrational spectroscopy

The molecular orientation of steroidal side chains at rubbed polyimide (PI) surfaces is studied by sum frequency generation (SFG) vibrational spectroscopy. The main objective is to find a correlation between the molecular structure of the PI film and the liquid crystal alignment on the polymer. Anal...

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Bibliographic Details
Published in:The Journal of chemical physics 2021-08, Vol.155 (8), p.084702-084702
Main Authors: Nguyen, Trinh Thi, Khuat, Hien Thi Thu, Asakura, Shinya, Mizutani, Goro, Murakami, Yoshitaka, Okada, Takashi
Format: Article
Language:English
Subjects:
Alignment
Chains (polymeric)
Crystal structure
Liquid crystals
Molecular structure
Orientation
Physics
Polyimide resins
Polymer films
Polymers
Rubbing
Spectrum analysis
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Summary:The molecular orientation of steroidal side chains at rubbed polyimide (PI) surfaces is studied by sum frequency generation (SFG) vibrational spectroscopy. The main objective is to find a correlation between the molecular structure of the PI film and the liquid crystal alignment on the polymer. Analysis of the SFG spectra shows that rubbing of the polymer film appears to cause conformational changes in the methyl group of the polymer side chain near the steroidal structure. However, rubbing does not significantly influence the orientation of the isopropyl group at the end of the polymer side chain. This shows that the liquid crystal alignment is not correlated with the orientation of the isopropyl group.
ISSN:0021-9606
1089-7690
DOI:10.1063/5.0057145