Abstract

Ioana Stanciu

DOI : http://dx.doi.org/10.13005/ojc/310419

This paper presets the study of the rheological characteristics of the concentrated polyethylene-polypropylene copolymer solutions over the temperature range of 313-363 K and for shear rates between 3 and 1312 s^-1. The measurements were performed on a Haake VT 550 rotational rheometer with a HV₁ sensor. The rheology of the concentrated solutions is influenced by the shear rate, temperature and concentration of the tested copolymer. We have used a successful model that describes the rheological behaviour of the concentrated solutions in comparison to other models that do not consider the copolymer’s concentration. The parameter A reaches a peak for the 10% solution and a minimum for the 3% solution. The parameter B displays close values for all of the studied solutions.

Relationship; Dynamic Viscosity; Concentrated Solutions; Rheology

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