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Schematic of PEGDA/SF hydrogel preparation procedure: SF was modified by GSH at first, then PEGDA was grafted to GSH-SF under UV light exposition. With an increase in the exposure time to UV light, the material undergoes a phase change from liquid to hydrogel due to the crosslinking of PEGDA. Then, the prepared PEGDA/SF hydrogels were stored in the refrigerator at 4 °C for hydrogen bond formation.
