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Schematic representation of the photo-cross-linking reactions between the vinyl groups in the (a) formation of HHA, and between the vinyl and SH groups in the formation of HAG in the (b) absence and (c) presence of NPPLGA-GSNO. (d) FTIR spectra of HAGMA and HHA and (e) Raman spectra of HAG1, highlighting the reduction or full disappearance of the band assigned to the vinyl group at 1640 cm−1 after photo-cross-linking.
