Fracture analysis of annealed PVDF films |
| |
Authors: | Gernot M. Wallner, Zoltan Major, Gü nther A. Maier,Reinhold W. Lang, |
| |
Affiliation: | aInstitute of Materials Science and Testing of Plastics, University of Leoben, Franz-Josef-Str. 18, 8700 Leoben, Austria bPolymer Competence Center Leoben GmbH, Roseggerstr. 12, 8700 Leoben, Austria cMaterial Center Leoben GmbH, Roseggerstr. 12, 8700 Leoben, Austria |
| |
Abstract: | The effect of annealing 50 μm thick, extruded poly(vinylidene fluoride) films in form (-PVDF) was investigated by differential scanning calorimetry and mechanical testing on unnotched and double-edge notched tensile specimens. As to the fracture behavior, micromechanisms of cavitation, spherulite breakdown, fiber bundle structure formation and - to β-phase transformation were detected. The progressive structural evolution taking place during annealing affected the deformation and fracture behavior significantly. While the annealing-induced subtle distinctions in microstructure are slightly reflected by the determined mechanical and essential work of fracture (EWF) properties, a distinct differentiation was possible by analysis of the process zone. A correlation between characteristic values of the process zone at necking and the endothermic transitions due to secondary crystallization determined by differential scanning calorimetry (DSC) was established. Annealing of PVDF films facilitates the micromechanism of cavitation, which is presumably related to perfection of morphological superstructures (spherulites) and, thus, interspherulitic stress concentration and failure. |
| |
Keywords: | PVDF Film Fracture Annealing |
本文献已被 ScienceDirect 等数据库收录! |
|