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Extrusion of poly(vinylidene fluoride) recycled filaments : effect of the proce...
Silva, Marco Aurélio Pinto; Martins, R. S.; Carvalho, Helder; Nóbrega, J. M.; Lanceros-Méndez, S.This study analyses the possibility of reprocessing used poly(vinylidene fluoride), PVDF, maintaining the main properties critical for its use in piezoelectric sensor/actuator applications. The influence of multiple reprocessing cycles of PVDF on crystallinity and ß-phase content fundamental for its electroactive behaviour, was studied. Nine reprocessing cycles were completed and it was found that the material ...
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.
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...
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...
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 ...
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