Abstract
We investigate the liquid-crystal (LC) alignment direction onphotoalignment films formed from photosensitive polyestercontaining thrifluoromethyl moieties (PPDA) with various molecularweights by crossed polarized optical microscopy. It isfound that LC alignment behaviour changes with molecular weight ofPPDA. The LC alignment on PPDA irradiated films with the highestmolecular weight is homogeneous, while those with low and intermediatemolecular weights are homeotropic. However, surface morphologies showweak dependence on molecular weight. The surfaces are smooth and thereis no clear morphological anisotropy on these aligned films observed byan atomic force microscope. The surface energies of the irradiatedfilms are also measured by using an indirect contact-angle method whereboth surface energy and its polar component increase with increasingmolecular weight. Different polar surface energies can be considered asa main reason for different alignment characteristics.
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