Time-dependent failure in load-bearing polymers : a potential hazard in structural applications of polylactides

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureHoofdstukAcademic

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Samenvatting

Polylactides are commonly praised for their excellent mechanical properties (e.g. a high modulus and yield strength). In combination with their bioresorbability and biocompatibility, they are considered prime candidates for application in load-bearing biomedical implants. Unfoliunately, however, their long-term performance under static load is far from impressive. In a previous in vivo study on degradable polylactide spinal cages in a goat model it was observed that, although short-term mechanical and real-time degradation experiments predicted otherwise, the implants failed prematurely under the specified loads. In this chapter we demonstrate that this premature failure is attributed to the time-dependent character of the material used . The phenomenon is common to all polymers, and finds its origin in stressactivated segmental molecular mobility leading to a steady rate of plastic flow. The main conclusion is that knowledge of the instantaneous strength of a polymeric material is insufficient to predict its long-term performance.
Originele taal-2Engels
TitelDegradable polymers for skeletal implants
RedacteurenP.I.J.M. Wuisman, T.M. Smit
Plaats van productieNew York
UitgeverijNova Publishers
Pagina's21-39
Aantal pagina's19
ISBN van geprinte versie978-1-60692-426-6
StatusGepubliceerd - 2009

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Citeer dit

Govaert, L. E., Engels, T. A. P., Söntjens, S. H. M., & Smit, T. H. (2009). Time-dependent failure in load-bearing polymers : a potential hazard in structural applications of polylactides. In P. I. J. M. Wuisman, & T. M. Smit (editors), Degradable polymers for skeletal implants (blz. 21-39). New York: Nova Publishers.