Abstract
The tensile properties of simultaneously biaxially drawn solution-crystallized ultra-high molecular weight polyethylene (UHMWPE) films were investigated as a function of draw ratio and were related to the data obtained for uniaxially drawn tapes. The Young's modulus of a biaxially drawn polyethylene film with a random in-plane orientation appears to amount to 3 8 of the Young's modulus of a tape drawn to the same extent uniaxially. Furthermore, the tensile strength is found to depend solely upon the draw ratio and not upon the drawing geometry since at the point of fracture the orientation in the film has become approximately uniaxial. These relationships are only valid for draw ratios ⩽10, whereas for draw ratios >10 the tensile properties of the biaxially drawn film are not significantly improved in contrast to those of uniaxially drawn tape.
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