Project/scholarship details
- Project/scholarship ID
108801
- Reference
PTDC/CTM/108801/2008
- FundRef URI
- Funder
FCT - Fundação para a Ciência e a Tecnologia, I.P.
- Funder's country
Portugal
- Funding program
5876-PPCDTI
- Funding amount
119,000.00 €
- Start date
2010-05-01
- End date
2013-10-31
Documents
Electroactive tape extrusion : influence of processing conditions on the β-phas...
Martins, R. S.; Silva, Marco Aurélio Pinto; Carneiro, O. S.; Rocha, J. G.; Nóbrega, J. M.; Carvalho, Helder; Lanceros-Méndez, S.Poly(vinylidene fluoride), PVDF, in its polar β-phase, is known to possess strong piezoelectric properties, among polymers. The α phase of PVDF is the most stable phase when the polymer crystallizes from the melt. In this way, the electroactive phase of the material is commonly obtained by inducing the α to β phase transformation through mechanical stretching at a given temperature, being the stretch ratio and ...
Effect of the processing conditions on the mechanical and electrical properties...
Silva, Marco Aurélio Pinto; Martins, R. S.; Nóbrega, J. M.; Carvalho, Helder; Lanceros-Méndez, S.Polypropylene (PP) shows a number of desirable properties that make it a versatile material among thermoplastic polymers. Due to its low cost and density, it is an excellent resin for conductive polymer composites (CPCs).[1] CPCs mainly consist on a polymer matrix with incorporated carbonaceous fillers. These multifunctional materials are routinely employed in various commercial applications due to their good e...
Production of electroactive filaments by coextrusion
Nóbrega, J. M.; Ferreira, A.; Costa, Pedro; Carvalho, Helder; Sencadas, Vítor João Gomes Silva; Lanceros-Méndez, S.The development of new products for i-textiles (interactive textiles) or e-textiles (electronic textiles) applications shows a significant growth in the most recent years due to their huge potential. Although much scientific work has been published in the last years, actual practical applications are still limited. This is due, on one hand, to unsatisfactory state of development of the technology and, on the ot...
Extrusion of piezoelectric filaments
Martins, R. S.; Lanceros-Méndez, S.; Nóbrega, J. M.; Carvalho, Helder; Rocha, J. G.; Silva, Marco Aurélio PintoThe application of electroactive materials in textile products has a huge potential. However, the difficulties related to the integration in textile products of materials that possess those characteristics have limited the development of practical applications that fully exploit their capabilities. This works describes the development of a technology, which pursues the production of electroactive materials easy...
Coextrusion of polymeric piezoelectric filaments
Martins, R. S.; Nóbrega, J. M.; Gonçalves, Renato Ferreira; Silva, Marco Aurélio Pinto; Lanceros-Méndez, S.; Rocha, J. G.; Carvalho, HelderThe difficulties related to the development of industrial scalable production methodologies have limited the number of applications currently available in the field of interactive/electronic textiles, which are far below the anticipated a few years ago. In these areas the integration of piezoelectric materials, that possess sensing/actuating capabilities, such as poly(vinylidene fluoride), PVDF, and can be proc...
Piezoelectric filaments produced by coextrusion
Martins, R. S.; Gonçalves, Renato Ferreira; Rocha, J. G.; Nóbrega, J. M.; Carvalho, Helder; Lanceros-Méndez, S.Considering the significant interest of both the academic and industrial communities in the fields of i/e-textiles (interactive/electronic textiles), the number of developed applications is far below the expected. This fact is mainly related to the difficulties on the development of production methodologies adequate to industrial scale processes. In this areas the integration of piezoelectric materials, that po...
Co-axial piezoelectric sensors for e-textiles applications
Martins, R. S.; Gonçalves, Renato Ferreira; Rocha, J. G.; Nóbrega, J. M.; Carvalho, Helder; Lanceros-Méndez, S.This work reports on the development of piezoelectric filaments for flexible sensors produced at high production rates, adequate for the industrial scale.; Fundação para a Ciência e a Tecnologia (FCT) - FCT PTDC/CTM/108801/2008
Three layer polymer piezoelectric filaments produced by extrusion
Martins, R. S.; Gonçalves, Renato Ferreira; Azevedo, Tiago; Nóbrega, J. M.; Carvalho, Helder; Lanceros-Méndez, S.; Rocha, J. G.Poly(vinylidene fluoride) (PVDF) is extensively studied due to its piezo-, pyro- and ferroelectric properties. These properties enable the use of this polymer in a number of applications either as sensor or actuator. PVDF is a semi-crystalline polymer and can crystallize in four different crystalline phases, called α, β, γ and δ. The β-phase presents the most interesting electroactive activity. These properties...
Piezoelectric co-axial filaments produced by co-extrusion of poly(vinylidene fl...
Martins, R. S.; Gonçalves, Renato Ferreira; Rocha, J. G.; Nóbrega, J. M.; Carvalho, Helder; Lanceros-Méndez, S.Article first published online: 3 APR 2014 : http://onlinelibrary.wiley.com/doi/10.1002/app.40710/abstract. DOI 10.1002/app.40710.; The development of new thermoplastic polymer-based piezoelectric sensors with filament geometry is described. These filaments are appropriate for integration into textiles and provide new possibilities in the design and development of low cost flexible sensors produced at high rate...
Processing and electrical response of fully polymer piezoelectric filaments for...
Martins, R. S.; Silva, Marco Aurélio Pinto; Gonçalves, Renato Ferreira; Rocha, J. G.; Nóbrega, J. M.; Carvalho, Helder; Souto, A. PedroThis paper describes the production and characterization of novel geometries for piezoelectric products with a large potential in the design and implementation of flexible sensors produced at low cost and high rates. In particular, the filament geometry, appropriate for integration into textiles, is analyzed. Piezoelectric filaments producing electrical signals under bending or traction stress, thus acting as m...
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