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Effect of Nano-Particles on Flow and Recovery of Polymer Nano-Composites in the Melt State

This Paper was invited from the PPS Asia/Australia Regional Meeting held on Kish Island, Iran, November 15–17, 2011
  • H. M. Hassanabadi and D. Rodrigue
Published/Copyright: August 22, 2013
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Abstract

The effect of nano-particle geometry on flow and recovery of polymer melts based on ethylene vinyl acetate (EVA) was investigated. Two nano-particles, calcium carbonate (CaCO3) and montmorillonite clay, were used with concentrations between 2.5 and 15% by weight. First, by using small amplitude oscillatory shear and transient step shear tests, the linear and non-linear response of the nano-composites was studied. Then, to examine the structure recovery, the same behavior was studied on pre-sheared samples. The linear and non-linear data revealed that the effect of nano-particles in material flow is more important for anisometric particles which can be attributed to their ability to form a fractal structure controlling the rheological properties while spherical particles are not able to form such networks. Recovery experiments revealed that while nano-composites containing spherical particles have relatively similar response in subsequent tests, the rheological properties decreased significantly for platelet particles. The recovery results were also interpreted based on a filler-network mechanism and the reduction of the nano effect for anisometric particles was related to the breakdown of the filler network. These observations were validated by morphological investigations.


Denis Rodrigue, Department of Chemical Engineering and CERMA, 1065 Avenue de la Médecine, Université Laval, Quebec, QC, G1V 0A6, Canada E-mail:

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Received: 2012-4-19
Accepted: 2012-11-21
Published Online: 2013-08-22
Published in Print: 2013-05-01

© 2013, Carl Hanser Verlag, München

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