Abstract:Load-extension behavior of a biaxially balanced polypropylene film which has been prepared by the two-step biaxial stretching method is not always isotropic, i.e., the Young's modulus and the yield stress along the pp-axis (the first stretching direction) are smaller than those along the Ps axis (the restretching direction), while the tenacity and the ultimate elongation which relate to large deformation, do not differ according to the direction of the test.Such an anisotropy appears more remarkably on the the… Show more
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