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International Journal of Polymer Science
Volume 2011 (2011), Article ID 427095, 5 pages
http://dx.doi.org/10.1155/2011/427095
Research Article

Viscoelastic Properties of Polypropylene Reinforced with Mica in 𝑇 𝛼 and 𝑇 𝛼 𝑐 Transition Zones

PIMM, CNRS UMR 8006, Arts et Métiers ParisTech, 151 boulevard de l'Hôpital, 75013 Paris, France

Received 15 March 2011; Accepted 9 May 2011

Academic Editor: Harald W. Ade

Copyright © 2011 S. Farzaneh and A. Tcharkhtchi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The viscoelastic properties of mica-reinforced polypropylene (PP) was studied in temperature range between −30°C and 120°C. WLF equation permits determining the free volume fraction in 𝛼 and 𝛼 𝑐 transitions regions. It was shown that the value of this parameter is lower for 𝛼 𝑐 transition, indicating that the free volume and thermal expansion of 𝛼 region is more than that of 𝛼 𝑐 region. At a 40% loading level, it was shown that the storage and loss modulus of mica-filled PP increases dramatically (in comparison with the pure polypropylene). The relative modulus does not change significantly at glassy state but it increases for the temperature higher than 𝑇 𝑔 . It was also shown that mica does not affect the glass transition temperature but results in an increase in 𝛼 𝑐 transition.