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.
Roozemond, P. C., Janssens, V., Puyvelde, van, P. C. J., & Peters, G. W. M. (2012). Suspension-like hardening behavior of HDPE and time-hardening superposition. Rheologica Acta, 51(2), 97-109. https://doi.org/10.1007/s00397-011-0570-1