Equal channel angular extrusion of ultra-high molecular weight polyethylene

Steven D. Reinitz, Alexander J. Engler, Evan M. Carlson, Douglas W. Van Citters

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Ultra-high molecular weight polyethylene (UHMWPE), a common bearing surface in total joint arthroplasty, is subject to material property tradeoffs associated with conventional processing techniques. For orthopaedic applications, radiation-induced cross-linking is used to enhance the wear resistance of the material, but cross-linking also restricts relative chain movement in the amorphous regions and hence decreases toughness. Equal Channel Angular Extrusion (ECAE) is proposed as a novel mechanism by which entanglements can be introduced to the polymer bulk during consolidation, with the aim of imparting the same tribological benefits of conventional processing without complete inhibition of chain motion. ECAE processing at temperatures near the crystalline melt for UHMWPE produces (1) increased entanglements compared to control materials; (2) increasing entanglements with increasing temperature; and (3) mechanical properties between values for untreated polyethylene and for cross-linked polyethylene. These results support additional research in ECAE-processed UHMWPE for joint arthroplasty applications.

Original languageEnglish (US)
Pages (from-to)623-628
Number of pages6
JournalMaterials Science and Engineering C
Volume67
DOIs
StatePublished - Oct 1 2016

Bibliographical note

Funding Information:
The authors acknowledge the NSF Research Experience for Undergraduates in Nanomaterials ( DMR-0754256 , PI's Ian Baker and Joseph BelBruno, Dartmouth College) for funding in support of AJE's preparatory work for this project, and the Holekamp Family Innovation Fellowship fund for SDR's graduate research support.

Publisher Copyright:
© 2016 Elsevier B.V.

Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

Keywords

  • DMA
  • DSC
  • ECAE
  • Entanglements
  • UHMWPE

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