2.8. Water solubility test
The solubility of the films (1 × 1 cm) were measured by immersing the pieces into 100 ml of distilled water and made to agitate in a mechanical shaker for 1 h at room temperature. Then the
remaining samples were filtered and dried at 110◦C for few hours
and it was weighed as final dry weight. The initial dry weight
was measured before immersing it in water by drying at 110.