Microstructure and on-line shear viscosity of PP/nano-CaCO3 composites prepared by twin-screw extruder
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Polymer-based nanocomposites have been extensively studied in research and application because the addition of the nanoparticles provides an increased stiffness, toughness, and dimensional stability. The aggregation of the nanoparticles, however, owing to their high surface energy, strongly decreases the properties of the nanocomposites, which enormously limits their engineering applications. Nano-calcium carbonate (CaCO3) is one of the most commonly used nanoparticles for thermoplastics, such as polypropylene (PP) and poly(vinyl chloride) (PVC). Many efforts have been devoted to decrease the aggregation of the nano-CaCO3 particles. The surface modification of the nano-CaCO3 is believed to be one of the effective ways, which can increase the polymer–nanoparticle interactions [1, 2, 3, 4].
The morphology and properties of the polymer nanocomposites or polymer blends are deeply related to the flow field during their processing. The research by Huang et al. showed that the type of the...
KeywordsScrew Speed Critical Percentage Screw Element Melt Shear Viscosity High Shear Intensity
Financial support provided by the National Natural Science Foundation of China (10272048) and Teaching and Research Award Program for Outstanding Young Teachers in Higher Education Institutions of MOE, P.R.C. is gratefully acknowledged.