Abstract
Alternative theories for the origin of the high temperature,α-relaxation in oriented linear polyethylene are compared with experiment. Theα-mechanism is assumed to be simple shear by all theories which differ in the allocation of the shear plane. The theories take the shear plane to be the interlamellar surface (theory I), a crystal plane of type (hk0) (theory IIA), a crystal plane of type (h00) (theory IIB). The experiments comprise measurements of the creep tensile compliance D(t) on oriented specimens at angles 0°, 45° and 90° to the draw axis. The crucial test involves the examination of specimens with approximately the same crystallographic orientation (determined by wide-angle X-ray diffraction) but differing orientation of lamellar normals. The analysis is based on the Reuss, constant stress hypothesis. It is shown that with this assumption, only theory I agrees with experiment.
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Buckley, C.P., McCrum, N.G. Anisotropy of the mechanical α-relaxation in biaxially oriented linear polyethylene. J Mater Sci 8, 928–940 (1973). https://doi.org/10.1007/BF00756623
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DOI: https://doi.org/10.1007/BF00756623