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Study of hydrogen annealing of ultrahigh molecular weight polyethylene irradiated with high-energy protons

Published online by Cambridge University Press:  31 January 2011

J. F. Wilson ,
J. R. Liu ,
F. Romero-Borja  and
Wei-Kan Chu
J. F. Wilson
Affiliation:
Texas Center for Superconductivity, University of Houston, Houston, Texas 77204–5932
J. R. Liu
Affiliation:
Texas Center for Superconductivity, University of Houston, Houston, Texas 77204–5932
F. Romero-Borja
Affiliation:
Texas Center for Superconductivity, University of Houston, Houston, Texas 77204–5932
Wei-Kan Chu
Affiliation:
Texas Center for Superconductivity, University of Houston, Houston, Texas 77204–5932
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Abstract

Ultrahigh molecular weight polyethylene, an important biomaterial for orthopedic implants, was irradiated with 2.6- and 3-MeV H+ ions at low doses from 5.7 × 1011 to 2.3 × 1014 ions/cm2. Fourier transform infrared spectroscopy showed that irradiation resulted in increased free radicals, carbon double bonds, and increased methyl and vinyl end groups. The free radicals resulted in poor polymer oxidative stability, as measured by increased carbonyl concentration. Hydrogen annealing after ion irradiation reacted with the free radicals generated during proton irradiation resulted in a 40–50% decrease in infrared absorption associated with carbonyl and prevented further oxidation.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 11 , November 1999 , pp. 4431 - 4436
Copyright
Copyright © Materials Research Society 1999

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