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

Research output: Chapter in Book/Report/Conference proceedingChapterAcademic

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Abstract

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.
Original languageEnglish
Title of host publicationDegradable polymers for skeletal implants
EditorsP.I.J.M. Wuisman, T.M. Smit
Place of PublicationNew York
PublisherNova Publishers
Pages21-39
Number of pages19
ISBN (Print)978-1-60692-426-6
Publication statusPublished - 2009

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Bearings (structural)
Hazards
Polymers
Plastic flow
Biocompatibility
Yield stress
Degradation
Mechanical properties
Experiments

Cite this

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 (Eds.), Degradable polymers for skeletal implants (pp. 21-39). New York: Nova Publishers.
Govaert, L.E. ; Engels, T.A.P. ; Söntjens, S.H.M. ; Smit, T.H. / Time-dependent failure in load-bearing polymers : a potential hazard in structural applications of polylactides. Degradable polymers for skeletal implants. editor / P.I.J.M. Wuisman ; T.M. Smit. New York : Nova Publishers, 2009. pp. 21-39
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Govaert, LE, Engels, TAP, Söntjens, SHM & Smit, TH 2009, Time-dependent failure in load-bearing polymers : a potential hazard in structural applications of polylactides. in PIJM Wuisman & TM Smit (eds), Degradable polymers for skeletal implants. Nova Publishers, New York, pp. 21-39.

Time-dependent failure in load-bearing polymers : a potential hazard in structural applications of polylactides. / Govaert, L.E.; Engels, T.A.P.; Söntjens, S.H.M.; Smit, T.H.

Degradable polymers for skeletal implants. ed. / P.I.J.M. Wuisman; T.M. Smit. New York : Nova Publishers, 2009. p. 21-39.

Research output: Chapter in Book/Report/Conference proceedingChapterAcademic

TY - CHAP

T1 - Time-dependent failure in load-bearing polymers : a potential hazard in structural applications of polylactides

AU - Govaert, L.E.

AU - Engels, T.A.P.

AU - Söntjens, S.H.M.

AU - Smit, T.H.

PY - 2009

Y1 - 2009

N2 - 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.

AB - 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.

M3 - Chapter

SN - 978-1-60692-426-6

SP - 21

EP - 39

BT - Degradable polymers for skeletal implants

A2 - Wuisman, P.I.J.M.

A2 - Smit, T.M.

PB - Nova Publishers

CY - New York

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Govaert LE, Engels TAP, Söntjens SHM, Smit TH. Time-dependent failure in load-bearing polymers : a potential hazard in structural applications of polylactides. In Wuisman PIJM, Smit TM, editors, Degradable polymers for skeletal implants. New York: Nova Publishers. 2009. p. 21-39