่ranged from 30 to 700 1C with a heating rate of 10 1C min1 under
nitrogen. The tensile properties of the films with dimensions of
60 13 0.03 mm3 in dry and wet (soaked in water for 1 h) states
were measured on LRX Tensile Testing Machine (Lloyd, USA) at a
crosshead speed of 10 mm/min at room temperature.