Abstract
The mechanical loss factor of high density polyethylene has been measured during creep and stress relaxation experiments. The application of a constant stress (creep) or strain (relaxation) resulted in an instantaneous increase in tan δ above the value obtained in absence of the creep or relaxation process. During the flow the tanδ-value decreased and approached an apparent equilibrium value slightly above the value obtained without the static load or deformation. This behaviour was observed both at 1 and 10 Hz and at 23 and 60 °C. It is suggested that this time dependence of the mechanical loss factor is associated with the basic mechanisms responsible for the creep or relaxation process itself.
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Kubát, J., Nilsson, L.Å. & Rigdahl, M. Transient behaviour of the mechanical loss factor of high density polyethylene during creep and relaxation. Rheol Acta 23, 40–45 (1984). https://doi.org/10.1007/BF01333874
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DOI: https://doi.org/10.1007/BF01333874