Abstract
The influence of tensile deformation on gel-spun and hor-drawn ultra-high molecular weight polyethylene fibers has been investigated. In high modulus polyethylene fibers no deformation energy is used to break chemical bonds during deformation, and flow is predominantly present next to elastic behavior. Flow is reversible after tensile deformation to small strains, but becomes irreversible when yielding occurs.
Stress relaxation experiments were used to determine the elastic and flow contribution to tensile deformation. A simple quantitative relation could then be derived for the stress-strain curve that directly links yield stress to modulus. Experimental stress-strain curves could be reasonably described by this relation.
Flow during tensile deformation is shown to be correlated with the introduction of the hexagonal phase in crystalline domains. A mechanism of flow is proposed in which, at first, tie molecules or intercrystalline bridges are pulled out of crystalline blocks (reversible), followed by the break-up of crystalline blocks through slip of microfibrils past each other (stress-induced melting, irreversible).
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van der Werff, H., Pennings, A.J. Tensile deformation of high strength and high modulus polyethylene fibers. Colloid Polym Sci 269, 747–763 (1991). https://doi.org/10.1007/BF00657441
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DOI: https://doi.org/10.1007/BF00657441