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Proton Modification of Ultra High Molecular Weight Polyethylene to Promote Crosslinking for Enhanced Chemical and Physical Properties

Published online by Cambridge University Press:  21 February 2011

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

Crosslinking onset was investigated for ultra high molecular weight polyethylene(UHMW-PE) implanted with 2.6 MeV H+ ions at low doses from 6×1011-3×1013 ions/cm2. Crosslinking in the near surface region(20–40μm) was determined from gel permeation chromatography(GPC) of 1,2,4 trichlorobenzene sol fractions and increased with dose. Fourier transform infrared spectroscopy(FTIR) showed irradiation resulted in increased free radicals confirmed from increased carbonyl groups. Hydrogen annealing after ion implantation resulted in 38–49% decrease in FTIR peak associated with carbonyl.

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