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International Journal of Polymer Science
Volume 2014, Article ID 150589, 9 pages
Research Article

Poly(Butylene Terephthalate) Based Composites Containing Alumina Whiskers: Influence of Filler Functionalization on Dielectric Properties

1Institute of Polymers, Composites and Biomaterials, National Council of Research of Italy, Via Campi Flegrei, 34-80072 Pozzuoli, Italy
2Department of Chemical, Materials Engineering and Industrial Production, University of Naples Federico II, Piazzale Tecchio, 80-80125 Naples, Italy
3INSTM-Reference Centre for Processing Technology of Polymers and Composites, University of Naples Federico II, Piazzale Tecchio, 80-80125 Naples, Italy
4Department of Electrical Engineering and Information Technology, University of Naples Federico II, Piazzale Tecchio, 80-80125 Naples, Italy

Received 22 July 2013; Accepted 7 March 2014; Published 2 April 2014

Academic Editor: Nanda Gopal Sahoo

Copyright © 2014 Pietro Russo 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(butylene terephthalate) (PBT) is one of the most widely used semicrystalline thermoplastics polyester because of its superior thermal and mechanical properties, high dimensional stability and excellent processability. In this research PBT-based nanocomposites, including various amounts (up to 10 wt%) of commercial alumina whiskers, have been prepared by using a Brabender internal chamber mixer and analysed in terms of morphological features and dielectric properties. Specific attention has been focused on the effect of the filler functionalization considering 3-glycidoxy propylmethoxysilane (GPS) or 3-methacryloxypropyltrimethoxysilane (MPS) as coupling agents. Tests, performed on compounds filled with neat and functionalized alumina whiskers, show a clear dependence of relative dielectric permittivity , invariance of dissipation factor (), and a sensible increase of volume electrical resistivity with the filler’s content and are encouraging for a future introduction of such composites in many electrical applications.