Dynamic mechanical analysis and creep behaviour of ß-PVDF films

• Autor(a) principal: Mano, J. F.
• Data de Publicação: 2004
• Outros Autores: Sencadas, Vítor João Gomes Silva, Costa, A. Mello, Lanceros-Méndez, S.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/1822/3522
• topic: Polyvinylidene fluoride; Creep; Mechanical behaviour; Relaxations; DMA; Science & Technology

In this work, tensile dynamic mechanical analysis (DMA) was used to characterise the solid-state rheological properties of a commercial ß-polyvinylidene fluoride (PVDF) film in the two main directions (longitudinal and transversal to the stretch direction). The ß-relaxation, assigned to the segmental motions within the amorphous phase, is observed at∼−25 ◦C. The alpha-c-relaxation is observed above room temperature. This relaxation is the main responsible for the anelastic properties of the material and to the short-term creep behaviour. Longer-term creep tests along the longitudinal direction were also performed and the Eyring model was applied, in order to characterize the flow-process within the polymeric structure. The results suggest that long-term creep is mostly controlled by the deformation of amorphous tie-chains that connect adjacent crystalline lamellae.