Synthesis of Photoresponsive Hydrogels Using Cinnamic acid and Four-Arm Poly(ethylene glycol)
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Hydrogels have various potential applications in the biomedical field due to their hydrophilicity and extremely high water content. Control over the physical properties of a hydrogels by external stimulus is very important and have been actively studied. Light can be controlled spatially and temporally very easily and conveniently, which is a very interesting stimulus for manipulating hydrogel properties. The cinnamate group becomes photodimerization under UV light and provides photosensitive polymers containing cinnamate groups to be crosslinked solely under UV irradiation. In this study, we describe the synthesis of photoresponsive hydrogels using cinnamic acid and four-arm, amine-terminated poly(ethylene glycol). The porous structure and composition of the hydrogels were confirmed by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. The change in absorbance of the hydrogel with respect to UV irradiation was confirmed by absorption spectroscopy.