Designing biostable polyurethane elastomers for biomedical implants

Pathiraja A. Gunatillake, Darren J. Martin, Gordon F. Meijs, Simon J. McCarthy, Raju Adhikari

Research output: Contribution to journalArticlepeer-review

135 Scopus citations


The chemical structure, synthesis, morphology, and properties of polyurethane elastomers are briefly discussed. The current understanding of the effect of chemical structure and the associated morphology on the stability of polyurethanes in the biological environments is reviewed. The degradation of conventional polyurethanes appears as surface or deep cracking, stiffening, and deterioration of mechanical properties, such as flex-fatigue resistance. Polyester and poly(tetramethylene oxide) based polyurethanes degrade by hydrolytic and oxidative degradation of ester and ether functional groups, respectively. The recent approaches to develop polyurethanes with improved long-term biostability are based on developing novel polyether, hydrocarbon, polycarbonate, and siloxane macrodiols to replace degradation-prone polyester and polyether macrodiols in polyurethane formulations. The new approaches are discussed with respect to synthesis, properties and biostability based on reported in vivo studies. Among the newly developed materials, siloxane-based polyurethanes have exhibited excellent biostability and are expected to find many applications in biomedical implants.

Original languageEnglish (US)
Pages (from-to)545-557
Number of pages13
JournalAustralian Journal of Chemistry
Issue number6
StatePublished - Jul 25 2003

ASJC Scopus subject areas

  • Chemistry(all)


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