2.2.3. Elasticity and tension strength
The films (30 mm 20 mm) were analyzed for elasticity and tension strength according to ASTM D 882-02 using an Instron Universal Testing Machine (Model 3367, Instron1, Norwood, MA, USA) with a 1 kN load cell, speed of approximately 8.3 mm s1 and initial distance of 35 mm between grips. The experiments were repeated eight times.