Encontrados 3 documentos, a visualizar página 1 de 1
Estudo da relação entre a resposta piezoeléctrica macro-e microscópica do poli(...
Nunes, J. SerradoDissertação de mestrado em Engenharia de Materiais ; Na vasta gama dos polímeros, o poli(fluoreto de vinilideno) (PVDF), é o que reúne as propriedades piezo, piro e ferroeléctricas mais interessantes do ponto de vista científico e tecnológico. Assim sendo, o objectivo deste trabalho consistiu em estudar e caracterizar a resposta piezoeléctrica deste polímero, quer na escala microscópica quer na macroscópica, r...
Electrical and microstructural changes of β-PVDF under uniaxial stress studied ...
Nunes, J. Serrado; Sencadas, V.; Wu, A.; Vilarinho, Paula Maria; Lanceros-Méndez, S.Chain reorientation may be induced in polyvinylidene fluoride (PVDF) in its β-phase by applying a deformation perpendicular to the pre-oriented polymeric chains. This reorientation begins right after the yielding point and seems to be completed when the stress-strain curve stabilizes. As the deformation process plays an important role in the processing and optimisation properties of the material for practical a...
Piezoelectric and optical response of uniaxially stretched (VDF/TrFE) (75/25) c...
Nunes, J. Serrado; Kouvatov, A.; Mueller, V.; Beige, H.; Brandão, P. M.; Belsley, M.; Moreira, M. V.; Lanceros-Méndez, S.The phase diagram of the poly(vinylidene fluoride-trifluorethylene) (P(VDF-TrFE)) copolymer system shows for VDF contents of 50...85 mol% a ferroelectric (FE)-paraelectric (PE) phase transition below melting temperature. Investigations on P(VDF-TrFE) 75/25 samples revealed a slight anisotropic behaviour, which leads to a strongly anisotropic stretching effect both on the phase transition and on the amount and n...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||