Abstract
Viscoelastic parameters of poly(butylene terephthalate) melt in compression creep have been measured in an Instron Capillary Rheometer. Bulk compression creep complianceB(t) shows plateau regions in the molten state and in the melt crystallized state, both decreasing with increasing stress. Shifting ofB(t) curves provides master curves suitable for analyzing the total (superposed elastic and viscous) bulk compression behavior.
Volume viscosity decreases with both increasing stresses and compression rates but seems to be independent of temperature. Its values are larger than those from constant compression rate experiments, possibly due to the presence of elastic effects.
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Sanchez-Sancha, M., Aleman, J.V. Compression creep of molten poly (butylene terephthalate). Rheol Acta 27, 634–638 (1988). https://doi.org/10.1007/BF01337459
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DOI: https://doi.org/10.1007/BF01337459