Abstract
The large amplitude oscillatory shear (LAOS) behavior of a high density polyethylene (HDPE) pipe resin containing 2% carbon black has been measured with a sliding plate rheometer incorporating a shear stress transducer. We have evaluated a structural network theory recently proposed by De Kee and Chan Man Fong for suspensions, in LAOS. This model provides for the creation of junctions due to an imposed flow field, and has been proposed as a generalization of the Liu kinetic rate equation, to model the complex behavior of suspensions. A new model, also based on the transient network concept, is proposed for filled polymer melts, and has the desirable feature of separating the effects of the filler material from the entanglement kinetics of the pure polymer. Both models are able to fit the steady shear viscosity data measured for this material. We find that both models are capable of predicting the LAOS behavior of this material, except for severe conditions.
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