Abstract
The interactions occurring at the interface between a liquid crystal (LC) and the walls of a LC cell have been studied using microsecond time resolved Fourier transform infrared (FTIR) spectroscopy. We have found that, by varying the structure of the alignment layers, different rates of electro-optical response could be achieved. These differences stem from the different strengths of interactions between the LC and the alignment layers. No specific, strong interactions (i.e. hydrogen bonding) were found by a direct analysis of the spectra. By calculating the local dipole moment of the polymer films using semi-empirical molecular orbital methods, a direct correlation between the electro-optical behavior and dipole moment was found for several polymers with similar base structures. This shows that the interactions at the LC/alignment layer interface are dominated by dipole–dipole forces.
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