Water absorption capacity (WAC) was determined by immersing previously weighed films in DI water at room temperature (30 °C) until they were equilibrated. After that, the films were then removed from the water, and excess water at the surface of the films was blotted out with Kimwipes®. The weight of the swollen films was measured, and the procedure was repeated until there was no further weight change. Water content was calculated using the following formula: