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Fabrication of photo-active trans-3-(4-pyridyl)acrylic acid modified chitosan


Photo-active trans-3-(4-pyridyl)acrylic acid (PYA) modified chitosan (CSPA) was synthesized with different functionalization degrees and extensively examined using Fourier transform infrared spectra (FTIR), 1H nuclear magnetic resonance (NMR) in order to elucidate the chemical structure of the modified biopolymer. The modified CSPA with various substitution degrees were casted in form of thin membranes and cross-linked under photo-chemical condition by exposure to ultra-violet light via [2π + 2π] cycloaddition reaction of the incorporated PYA units. The photo-induced reaction were examined using UV-visible light spectra and the cross-linked hydrogel were investigated using both XRD and scanning electron microscope (SEM). Also, the mechanical properties of the hydrogel membranes were studied by measuring the variations of both tensile strength and elongation against corss-linking densities.