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- Title
Rubbing-induced anisotropy of long alkyl side chains at polyimide surfaces.
- Authors
Jayathilake, Himali D; Zhu, Min Hua; Rosenblatt, Charles; Bordenyuk, Andrey N; Weeraman, Champika; Benderskii, Alexander V
- Abstract
Molecular organization at polyimide surfaces used as alignment layers in liquid crystal displays was investigated using vibrational sum frequency generation (SFG) spectroscopy. We focus on the orientation of the long alkyl side groups at the polymer surface using polarization-selected SFG spectra of the CH(3)- and CH(2)-stretch modes of the side chain. Mechanical rubbing and baking, an accepted industrial procedure used to produce pretilt of the liquid crystal, was found to induce pronounced azimuthal anisotropy in the orientational distribution of the alkyl side chains. Orientational analysis of the SFG vibrational spectra in terms of the azimuthal and tilt angles (in and out of plane, respectively) of the alkyl side chains shows their preferential tilt along the rubbing direction, with the azimuthal distribution narrower for stronger rubbed polymer samples.
- Publication
The Journal of chemical physics, 2006, Vol 125, Issue 6, p64706
- ISSN
0021-9606
- Publication type
Journal Article
- DOI
10.1063/1.2238865