Anisotropy of viscoelastic transitions in oriented polyethylenes

Abstract

Measurements have been made of the anisotropy of viscoelastic behavior in cold‐drawn low‐density and high‐density polyethylene sheets. In the low‐density polymer the β transition was shown to be highly anisotropic, maximum losses corresponding to shear on planes containing the axis of drawing and on planes perpendicular to this axis. In high‐density polyethylene the α transition shows anisotropy.