Encontrados 26 documentos, a visualizar página 1 de 3
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.Documento submetido para revisão pelos pares. A publicar em "Journal of applied polymer science". ISSN 1097-4628. 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 tex...
Processing and electrical response of fully polymer piezoelectric filaments for...
Martins, R. S.; Silva, Marco Aur??lio Pinto; Gon??alves, Renato Ferreira; Rocha, J. G.; N??brega, 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...
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...
Properties and processing by extrusion of electrically conductive multilayer fi...
Martins, R. S.; Gonçalves, Renato Ferreira; Azevedo, Tiago; Nóbrega, J. M.; Carvalho, Helder; Lanceros-Méndez, S.; Rocha, J. G.This work describes the production and characterization of three-layer piezoelectric filaments using two different electrically conductive polymers. The filaments were produced in a filament extrusion line, equipped with a coextrusion die that enabled a coaxial arrangement for a three-layer filament. For the inner and outer layers two different electrically conductive compounds were used, and the middle layer w...
Coextrusion of multilayer piezoelectric tape
Martins, R. S.; Brandão, A. C.; Nóbrega, J. M.; Carvalho, Helder; Lanceros-Méndez, S.Materials with piezoelectric properties are defined as materials that produce an electrical potential when subjected to mechanical stress (sensor function) or, in the opposite sense, produce mechanical work when subjected to an electrical field (actuator function). Poly(vinylidene fluoride), PVDF, is a polymer with a high piezoelectric coefficient, and thus is often used in the above mentioned applications. Th...
Influence of processing conditions on the b-Phase content of PVDF samples produ...
Martins, R. S.; Carneiro, O. S.; Lanceros-Méndez, S.; Nóbrega, J. M.; Carvalho, Helder; Rocha, J. G.; Silva, M. P.This research team has been working during the last couple of years on the development of industrial scalable technologies, based on the extrusion processing technique, for the prodution of piezoeletric products. This specific work comprises a study on the effect of tape extrusion processing conditions on the content of PVDF β-phase. For this purpose the extruded samples were uniaxially stretched up to ratios o...
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 piezoelectric products with a large potential in the design and implementation of flexible sensors produced at low cost and high rates. In particular, filament shaped geometry, appropriate for integration into textiles, is developed and described.
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.
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...
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