Abstract
A series of side-chain liquid crystalline photosensitive polymers with pendent chalcone moiety were synthesized. The structure of the thermotropic, novel liquid crystalline photosensitive monomers and polymers was confirmed by IR, 1H - and 13C- NMR and UV visible spectroscopic techniques. The molecular weight of the polymers was determined by gel permeation chromatography. The photo-crosslinking properties of these polymers were studied by ultraviolet spectroscopy. The crosslinking proceeds via 2π+2π cycloaddition reaction of the styryl unit. The rate of crosslinking increased with increase in methylene chain length of the polymer. The thermal stability of the polymers was assessed by thermogravimetric analysis (TGA). The phase behavior and mesomorphism of the polymers were investigated by differential scanning calorimetry, X-ray diffraction and polarizing optical microscopy. The polymers exhibited nematic phase in hot stage optical polarized microscope (HOPM).
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