Journal
RHEOLOGICA ACTA
Volume 51, Issue 2, Pages 97-109Publisher
SPRINGER
DOI: 10.1007/s00397-011-0570-1
Keywords
Polymer crystallization; Polyethylene; Rheology; Suspension models
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Funding
- Dutch Technology Foundation (STW) [08083]
- National Science Foundation [DMR-0710662]
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The rheology of solidifying high-density polyethylene (HDPE) is investigated. Experiments on an HDPE were performed with a novel RheoDSC device. Results agree quantitatively with simulations for a suspension of elastic spheres in a viscoelastic matrix except for very low values of space filling (< 5%), indicating that the rheological behavior of the crystallizing melt in the frequency range investigated is purely suspension like. The hardening behavior of the material is characterized in two different ways; a normalized rheological function and a time-hardening superposition (THS) master curve of rheological properties. An improvement is proposed to the procedure for performing THS that was previously used in the literature. Based on this procedure, a novel method for predicting the rheological properties of crystallizing melts is presented.
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