Dynamic mechanical analysis and creep behaviour of ß-PVDF films

• Author(s): Mano, J. F. ; Sencadas, V. ; Costa, A. Mello ; Lanceros-Méndez, S.
• Date: 2004
• Persistent ID: http://hdl.handle.net/1822/3522
• Origin: RepositóriUM - Universidade do Minho
• Subject(s): Polyvinylidene fluoride; Creep; Mechanical behaviour; Relaxations; DMA
• Document Type: Article
• Language: English

Description

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.