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Rheological and electrical analysis in carbon nanofibre reinforced polypropylen...
Lanceros-Méndez, S.; Paleo, A. J.; Silva, J.; Hattum, F. W. J. van; Ares, A. I.Two different types of carbon nanofibers (CNF) were incorporated in the same polypropylene (PP) matrix by twin-screw extrusion. The electrical characterization of both CNFs / PP composites as a function of volume fraction show different electrical performance: conducting and non-conducting. The objective of this work is to study the rheological behaviour of both composites with the aim of relating it to the ele...
On the origin of the electrical response of vapor grown carbon nanofiber + epox...
Silva, J.; Cardoso, P.; Paleo, A.J.; van Hattum, F. W. J.; Simões, Ricardo; Lanceros-Méndez, S.The origin of the electrical response of vapor grown carbon nanofiber (VGCNF) + epoxy composites is investigated by studying the electrical behavior of VGCNF with resin, VGCNF with hardener and cured composites, separately. It is demonstrated that the onset of the conductivity is associated to the emergence of a weak disorder regime. It is also shown that the weak disorder regime is related to a hopping dependi...
Degradation of the dielectric and piezoelectric response of b-poly(vinylidene f...
Silva, M. P.; Costa, Carlos M.; Sencadas, V.; Paleo, A. J.; Lanceros-Méndez, S.The effect of annealing temperature and time on the dielectric and piezoelectric response of poly(vinylidene fluoride), PVDF, has been studied. The observed decrease in the value of the dielectric, έ, and piezoelectric, d33, constants is related to depoling of the material and not to variations of the degree of crystallinity or the electroactive β-phase content. In a general way, the dielectric and piezoelectri...
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