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Creep of PVDF monofilament sutures: service performance prediction from short-term tests |
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| Authors: | João F Mano João L Lopes |
| Affiliation: | a Department of Polymer Engineering, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal b 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal c ISEP—Instituto Superior de Engenharia do Porto, CIEA, R Dr António Bernardino de Almeida, 431 4200-072 Porto, Portugal d Laboratory of Advanced Polymers and Optimized Materials (LAPOM), Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203-5310, USA |
| Abstract: | Isothermal short-term creep of poly (vinylidene fluoride) (PVDF) monofilament sutures was determined at several temperatures between 10 and 90 °C under the stress of 10 MPa. Long term service performance was predicted for 10 decades of time. The compliance master curve as a function of time fits a hyperbolic sine equation. The temperature shift factor as a function of the temperature aT (T) is accurately represented by a general equation based on free volume. A simple relationship between the two parameters of the equation is explored. The viscoelasticity of PVDF is also seen in dynamic mechanical analysis performed at the frequency of 1 Hz. The origin of the viscoelastic character well present in the deformability of the PVDF in service is due to the occurrence of the αc relaxation that is active at ∼50 °C (E″ peak at 1 Hz). |
| Keywords: | Mechanical performance relaxation behaviour Biomedical applications |
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