This
result indicated that higher interactions such as hydrogen bonding
occurred between the CG and the PVA. This result supports those of Nagahama and co-worker.They studied the
swelling behavior of a chitosan/gelatin blend compared to the chitosan
hydrogel. This sample showed more water resistance because
it had stronger hydrogen bonds compared to chitosan and gelatin.
In addition, this result was used to confirm the chemical structure
of the CG-g-PVA and was in agreement with the ATR-FTIR result.
The water resistance of CG-g-PVA was confirmed again through
the dissolution behavior in water at 80 ◦C. The dissolution behavior
of CG-g-PVA with different polymer ratios in hot water at 80 ◦C is
shown in the dissolution ratio of the CG-g-PVA in water at 80 ◦C