mPEG-CHO (MW 10000) contributes to the formation of three-dimensional porous scaffolds and serves as a delivery vehicle when carrying active substances. The -CHO functional group interacts with the -NH2 group of chitosan chains to form a glutaraldehyde-type adduct, thereby functionalizing mPEG. This functionalization and cross-linking affect the rigidity of the delivery system, enabling the cross-linked conjugate system to have a slow release function.