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| Naji, M. |
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| Motta, Antonella |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Kočí, Jan | Prague |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Ali, M. A. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Söntjens, Shm Serge
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Publications (6/6 displayed)
- 2020Imaging the In Vivo Degradation of Tissue Engineering Implants by Use of Supramolecular Radiopaque Biomaterialscitations
- 2015Hydrolytic and oxidative degradation of electrospun supramolecular biomaterialscitations
- 2015Hydrolytic and oxidative degradation of electrospun supramolecular biomaterials:In vitro degradation pathwayscitations
- 2012Time-dependent failure of amorphous poly-D,L-lactide : influence of molecular weightcitations
- 2010Time-dependent failure in load-bearing polymers : a potential hazard in structural applications of polylactidescitations
- 2000A scattering electro-optical switch based on dendrimers dispersed in liquid crystals
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article
Time-dependent failure of amorphous poly-D,L-lactide : influence of molecular weight
Abstract
The specific time-dependent deformation response of amorphous poly(lactic acid) (PLA) is known to lead to rapid failure of these materials in load-bearing situations. We have investigated this phenomenon in uniaxial compression on P(L)DLLA samples with various molecular weights. The experiments revealed a strong dependence of the yield stress on the applied strain rate. Lower molecular weights showed identical deformation kinetics as higher molecular weights, albeit at lower stress values. This dependence on molecular weight was incorporated into an Eyring-equation by introducing mobility through a virtual temperature that is shifted by the deviation of the Tg from Tg,�‡. Stress-dependent lifetime of polymer constructs was described by the use of this modified Eyring-equation, combined with a critical plastic strain. This model proves useful in predicting the molecular weight dependence of the time to failure, although it slightly overestimates life time at low stress levels for a material with very low molecular weight. The versatility of the model is demonstrated on e-beam sterilized PLDLLA, where the resulting reduction in molecular weight induces a substantial decrease in lifetime. A single Tg measurement provides sufficient information to predict the decrease in lifetime.