Crystal ageing in irradiated ultra high molecular weight polyethylene

  • D. Barron
  • M. N. Collins
  • M. J. Flannery
  • J. J. Leahy
  • C. Birkinshaw


Medical grade ultra high molecular weight polyethylene (UHMWPE) of two molecular weights has been γ irradiated in air to give received doses of 3.5 and 10 Mrad and aged in air for 25 months. Differential scanning calorimetry and wide and small angle X-ray diffraction (WAX and SAX) techniques and transmission electron microscopy have been used to characterize the materials. Polymer from an orthopaedic component, retrieved 10 years after implantation, has been subjected to the same analytical programme. The X-ray diffraction data shows that following irradiation two events occur with time, first a crystal refinement process, indicated by pronounced sharpening of the SAX peak, and secondly growth of a new crystal population of reduced lamellae thickness compared to the original crystal structures, shown by the development of a bimodal SAX pattern. Following irradiation crystallinity increases with time and this second crystal population makes a significant contribution to that increase. The retrieved component shows full development of these processes. It is considered that these crystallographic changes with time are responsible for the observed time dependent changes in the mechanical properties of air irradiated UHMWPE.


Differential Scanning Calorimetry UHMWPE Ultra High Molecular Weight Polyethylene Lamella Thickness Crystal Population 
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This work was made possible by a grant of time on the MPW 6.2 station of the Daresbury SRS for which the authors are grateful. The authors also wish to express their thanks to Dr. Chris Martin for his invaluable assistance in setting up the beamline for the experiments.


  1. 1.
    C. BIRKINSHAW, M. BUGGY, and J. J. WHITE, Mater. Chem. Phys. 14 (1986) 549CrossRefGoogle Scholar
  2. 2.
    C. BIRKINSHAW, M. BUGGY, S. DALY, and M. O’NEILL, Polym. Degrad. Stabil. 22 (1988) 285CrossRefGoogle Scholar
  3. 3.
    P. O’NEILL, C. BIRKINSHAW, J. J. LEAHY, and R. BARKLEY, Polym. Degrad. Stabil. 63 (1999) 31CrossRefGoogle Scholar
  4. 4.
    M. JASTY, D. D. GOETZ, C. R. BRAGDON, K. R. LEE, A. E. HANSON, J. R. ELDER, and W. H. HARRIS, J. Bone Joint Surg.-Am. 79A (1997) 349Google Scholar
  5. 5.
    J. H. DUMBLETON, J. A. D’ANTONIO, M. T. MANLEY, W. N. CAPELLO, and A. WANG, Clin. Orthop. Relat. Res. 453 (2006) 265CrossRefGoogle Scholar
  6. 6.
    A. WANG, H. ZENG, S. S. YAU, A. ESSNER, M. MANLEY, and J. DUMBLETON, J. Phys. D-Appl. Phys. 39 (2006) 3213CrossRefGoogle Scholar
  7. 7.
    W. BRAS, G. DERBYSHIRE, A. RYAN, G. MANT, R. LEWIS, A. FELTON, and N. GREAVES, Inst. Phys. Conf. Ser. 130 (1993) 635Google Scholar
  8. 8.
    A. RYAN, W. BRAS, G. R. MANT, and G. E. DERBYSHIRE, Polymer 35 (1994) 4537CrossRefGoogle Scholar
  9. 9.
    W. J. O’KANE, R. J. YOUNG, A. J. RYAN, W. BRAS, G. E. DERBYSHIRE, and G.R. MANT, Polymer 35 (1994) 1352CrossRefGoogle Scholar
  10. 10.
    E. L. HEELEY, A. V. MAIDENS, P. D. OLMSTED, W. BRAS, I. P. DOLBNYA, J. P. A. FAIRCLOUGH, N. J. TERRILL, and A. J. RYAN, Macromolecules 36 (2003) 3656CrossRefGoogle Scholar
  11. 11.
    R. J. CERNIK, P. BARNES, G. BUSHNELL-WYE, A. J. DENT, G. P. DIAKUN, J. V. FLAHERTY, G. N. GREAVES, E. L. HEELEY, W. HELSBY, S. D. M. JACQUES, J. KAY. T. RAYMENT, A. RYAN, C. C. TANG, and N. J. TERRILL, J. Synchrotron Radiat. 11 (2004) 163CrossRefGoogle Scholar
  12. 12.
    D. BARRON and C. BIRKINSHAW, Polymer 46 (2005) 9523CrossRefGoogle Scholar
  13. 13.
    P. O’NEILL, C. BIRKINSHAW, J. J. LEAHY, M. BUGGY, and T. ASHIDA, Polym. Degrad. Stabil. 49 (1995) 239CrossRefGoogle Scholar
  14. 14.
    L. H. SPERLING, in “Introduction to Physical Polymer Science” (John Wiley & Sons, New York, 1986)Google Scholar
  15. 15.
    F. J. BALTA-CALLEJA and C. G. VONK, in “X-ray Scattering of Synthetic Polymers” (Elsevier, New York, 1989)Google Scholar
  16. 16.
    V. PRENMATH, A. BELLARE, E. W. MERRILL, M. JASTY, and W. H. HARRIS, Polymer 40 (1999) 2215CrossRefGoogle Scholar
  17. 17.
    G. R. STROBL and W. HAGEDORN, J. Polym. Sci. Part B-Polym. Phys. 16 (1978) 1181Google Scholar
  18. 18.
    R. MUTTER, W. STILLE, and G. STROBL, J. Polym. Sci. B: Polym. Phys. 31 (1993) 99CrossRefGoogle Scholar
  19. 19.
    D. BARRON, in “The Morphology of Irradiated Ultra High Molecular Weight Polyethylenes”. PhD thesis, (University of Limerick, 2007)Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • D. Barron
    • 1
  • M. N. Collins
    • 1
  • M. J. Flannery
    • 1
  • J. J. Leahy
    • 1
  • C. Birkinshaw
    • 1
  1. 1.Department of Materials Science and TechnologyUniversity of LimerickLimerickIreland

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