Shear Thickening of BaTiO3 Nanoparticles-Filled Non-Newtonian Polymer Suspensions
Received Date: Nov 22, 2016 / Accepted Date: Jan 02, 2017 / Published Date: Jan 10, 2017
Abstract
Present paper represents hydrodynamic approach of describing the rheology of polymer suspensions filled with BaTiO3 nanoparticles. It was found the shear thickening phenomenon at low shear rates with the subsequent shear thinning behavior under high shearing. The addition of various amounts of DBP has led to change in shape and size of the polymer molecule influencing the flow type, flocculation processes and strength of initial microstructure. Shear thickening is caused by elastic deformation of structural bonds «polymer-polymer» in the initial microstructure. Thus, pseudoplasticity indicates high strength and incomplete plasticization; exceptional thixotropy shows excessive plasticizing effect of DBP because of too straightened polymer molecules. The destruction of intramolecular bonds under external forces caused formation of additional molecular entanglements and additional flocculation of unbounded nanoparticles. In turn, the instant transition from rheopexy to thixotropy has occurred at constant hydrodynamic radius of structural elements due to full flocculation of BaTiO3 nanoparticles with polymer molecules providing better printability.
Keywords: Rheology; Shear thickening; Rheopexy; Pseudoplasticity; Thixotropy
Citation: Umerova S, Ragulya A (2017) Shear Thickening of BaTiO3 Nanoparticles-Filled Non-Newtonian Polymer Suspensions. Rheol: open access 1: 105.
Copyright: © 2017 Umerova S, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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