Abstract
In order to investigate the dynamic behaviour of polypropylene based organoclay nanocomposite, the polypropylene matrix and a master batch of polypropylene modified anhydrid maleic were mixed by means of melt mixing technique. The experimental characterization was performed by using split Hopkinson pressure bars (SHPB), at different strain rates and temperatures. A significant increase of the yield stress of nanocomposite was shown with the present of organoclay, comparing to neat PP. A three-phase approach based on the micromechanical formulation of the cooperative model is proposed to model the yield behaviour of the polymer nanocomposite. Our proposed approach accounts for strain rate and temperature effects as well as the organoclay exfoliation effect. The predictions of models for the nanocomposite yield behaviour showed a good agreement with experimental data.
Highlights
Polymer based nanocomposite is one of the hottest worldwide research field from the last decades
Experimental results have shown that the yield stress increases with increasing strain rate, organoclay concentration and the extent of exfoliation
As expected, the yield stress decreases with increasing temperature
Summary
Polymer based nanocomposite is one of the hottest worldwide research field from the last decades. This is mainly because the introduction of a low amount of nanoparticles can effectively improve the properties of polymer. Few works were realized on polypropylene (PP) based organoclay nanocomposite, most of them were focused on the processing, thermal and physical characterization. There is no research on the dynamic mechanical behaviour of PP based organoclay nanocomposites. The dynamic mechanical behaviour of PP based organoclay nanocomposites was characterized by means of split Hopkinson pressure bars (SHPB). A three-phase model was used to predict the yield behaviour of the nanocomposites
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