Conclusions
Hydrogels and composite hydrogels prepared from pineapple
peel cellulose show differences in characterization and NaSA
release. As a functional miscible medium, PVPP can improve the
mechanical properties and thermal stability of the composite
hydrogels. The freeze-dried hydrogels possess higher ESR and NaSA
load ratios than the oven-dried hydrogels. PVPP addition makes the
freeze-dried hydrogels decrease in ESR and NaSA load ratios but
makes the oven-dried gels increase in ESR and NaSA load ratios.
Oven-drying processing and PVPP addition are propitious for slowing
the NaSA release.