Investigation of overshot in elongational viscosity of LDPE with prediction of MSF model

The presence of long side chains in LDPE molecule leads to the rise of uniaxial viscosity above trouton ratio in uniaxial elongational flow. In this paper the dynamic oscillatory tests at 3 different temperatures used for evaluating the time-temperature superposition. All dynamic moduli shifted to the reference temperature of 160 oC. The superimposed data showed that the time-temperature superposition principle holds for the studied LDPE. The strain hardening behavior of LDPE studied in unidirectional flow, at different strain rates. The strain hardening is investigaed by the acurency of MSF model predictions

Keywords:

Low density polyethylene , Dynamic frequency , Strain hardening , MSF model