2.3. Film evaluation
2.3.1. Mechanical properties
Longitudinal and transversal tensile tests were performed on a
Instron-5582 machine at 23 8C according to ASTM D638, ASTM
D882-97 and ASTM F904-98, to samples with dimensions of
25 mm 100 mm and putted in clamps separated 50 mm at a
crosshead speed of 500 mm/min. Maximal tensile strength,
yield strength, yield elongation, tensile strength, elongation at
break and elastic modulus were evaluated.