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International Journal of Polymer Science
Volume 2012 (2012), Article ID 252981, 6 pages
Research Article

Viscoelastic Properties of Mineral-Filled Poly(lactic acid) Composites

1Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
2Polymer Centre, Faculty of Technology, Tomas Bata University in Zlin, 76272 Zlin, Czech Republic
3Institute for Wood Technology and Renewable Materials, University of Natural Resources and Life Sciences, Vienna, Konrad Lorenz-Strasse 24, 3430 Tulln, Austria

Received 29 December 2011; Revised 27 February 2012; Accepted 1 March 2012

Academic Editor: Kibret Mequanint

Copyright © 2012 Adriana Gregorova et al. 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.


Poly(lactic acid) was filled with 20 wt% of the three mineral fillers Mica, Zeolite, and Vansil, differing in the particle shape and surface area. Viscoelastic properties of unfilled and filled composites were investigated via dynamic mechanical analysis, while filler and fracture surface morphology of the composites was analysed through scanning electron microscopy. Results demonstrate the relationships between viscoelastic damping behaviour of filled PLA composites and the filler distribution in the PLA matrix. Both damping reduction and scanning electron microscope analysis revealed that Zeolite was better distributed in the poly(lactic acid) matrix than the other used fillers Mica and Vansil. The interfacial filler/matrix adhesion has again proved to be the key factor determining thermal and mechanical properties of reinforced composite material.