Abstract
The effect of physical aging on the viscoelastic behavior of a cross-linked polyester resin is reported. Tensile creep and dynamic mechanical analysis (DMA) tests yielded creep compliance (S(t)) and dynamic shear complex compliance ( J ∗(ω) ) of the polymer. Thermoreversible physical aging was found to have significant effects on the creep response of the polyester. Physical aging shift factors were determined at 60, 80, 100 and 120°C. Standard frequency-temperature superposition procedures were used to construct master curves for the dynamic mechanical data. The shift constants c 1 = (70) and c 2 = (450° C) determined from DMA data were used to construct a smooth master curve for creep data. The predictions of long-term behavior by means of master curve construction were found to agree with experimentally measured long-term creep behavior when differences in material aging were introduced.
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