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Tensile Properties of Ultradrawn Polyethylene.
MASSACHUSETTS UNIV AMHERST MATERIALS RESEARCH LAB
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High density polyethylene filaments, prepared by a solid-state deformation in an Instron Capillary Rheometer, show unusually high crystal orientation, chain extension, axial modulus and ultimate tensile strength. The Youngs modulus and ultimate tensile strength have been determined from stress-strain curves. Gripping of this high modulus polyethylene has been a problem heretofore. Nevertheless, the measurement of ultimate tensile strength has become feasible by a special gripping procedure reported in this study. Tensile moduli show an increase with sample preparation temperature and pressure. The effect of strain rate and frequency on modulus has also been evaluated by a combination of stress-strain data and dynamic tension plus sonic measurements over nine decades of time.
APPROVED FOR PUBLIC RELEASE