Abstract
A series of polyimides (PIs) with side chains were fabricated from 6-(4-phenylphenoxy)hexyl-3,5-diaminobenzoate of various ratios with 4,4′-oxydianiline and 4,4′-oxydiphthalic anhydride. After PI alignment, films were directly fluorinated using a 10 vol% fluorine/nitrogen mix. The pretilt angle of liquid crystals on the PI films is much improved to more than 20°, and can be continuously controlled by changing the side-chain content of the PI films from 20 to 100%. The change of the pretilt angles is ascribed to the fluorinated microstructure of molecules at the surface rather than to the surface energy or surface morphology. Moreover, the improvement of rigidity and the steric repulsion of the fluorinated side chains result in an upright conformation of the side chains that leads to the high pretilt angle. Copyright © 2010 Society of Chemical Industry
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