An empirical equation on a shift factor for synthesizing master curves from nonlinear viscoelasticity functions based on free volume (abstract)
Copyright policy )An empirical equation on a shift factor for synthesizing master curves from nonlinear viscoelasticity functions based on free volume (abstract)
Ferry and Stratton proposed a relation between a shift factor and a strain. They assumed compressibility of free volume on the basis of a sample volume. On the other hand, we defined the compressibility on the basis of the free volume, and derived a new relation between the shift factor and the strain (or stress). The equation we obtained was different in the formula from the Ferry–Stratton equation, but the properties of the equations were quite similar. Our equation could satisfactorily approximate a relation between the shift factor and the strain for relaxation curves of a polyethylene film, and also the relation between the shift factor and the stress for creep curves of monofilaments of nylon and poly (ethyleneterephthalate). Fractions of free-volume were estimated from these equations.
- University of Fukui Japan
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