Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Mechanical Behavior of Piezoelectric Nanomembranes Doped with Carbon Nanotubes
Submission Author:
Antonio Avila , MG
Co-Authors:
Suchilla Garcia Leão, Nathalia Caroline Ferreira Menezes, Fernanda Luiza Rinco de Mendonça Lima, Marina Georgia Melo Martins, Matheus Norton Mello, Antonio Avila
Presenter: Suchilla Garcia Leão
doi://10.26678/ABCM.COBEM2017.COB17-1126
Abstract
Piezoelectric materials are attractive to industry due to its unique property of energy harvesting. However, a less explored characteristic is equally important, i.e. the possibility of being used as sensor/actuators. The limitations are frequently associated to the brittle behavior of such materials. Noticed that most of piezoelectric materials available into the market is based on ceramic compounds. In recent years, a new class of piezoelectric materials called piezo-polymers is gaining more attention. These polymers have semi-crystalline structures and the piezoelectric phase formation is, in general, induced by large deformations. This paper deals with three different piezo-polymers, i.e. PVDF (Poly vinylidene fluoride), PVDF-HFP), PVDF-HFP (Poly vinylidene fluoride-co-hexafluoropropylene) and PVDF-TrFE (poly vinyledene difluoride-trifluoroethylene). To be able to induce the beta phase formation, which is responsible to the piezoelectric behavior, the electrospinning technique was applied. Moreover, multi-walled carbon nanotubes were also added to these piezo-polymers during the nanofibers synthesis. The fiber diameters ranged from sub-micron (around 400 nm) to nanometers (approximately 100 nm). The PVDF-TrFE nanomembranes lead to a bead-less formation, while for PVDF and PVDF-HFP nanomembranes a large number of beads were observed. Furthermore, the beads morphology were also affected by the carbon nanotubes concentration and the usage or not of surfactants (in this case SDBS - Sodium dodecyl benzene sulfonate). Infrared Fourier Transform spectroscopy (FTIR) analysis spotted beta phase formation between 78% and 95%. Tensile test on these nanomembranes revealed a non-linear behavior and a correlation between piezoelectricity/beta phase formation and its mechanical response to loadings.
Keywords
Piezoeletric materials, nanomembranes, energy harvesting, carbon nanotubes
