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Keywords
(8)
ftir spectroscopy
Mechanical Property
Nitrogen
Oxidative Stability
Pilot Study
Polyethylene
Thin Film
High Molecular Weight
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Effect of europium(II) stearate on the mechanical properties and the oxidation resistance of UHMWPE
Effect of europium(II) stearate on the mechanical properties and the oxidation resistance of UHMWPE,10.1016/j.jmbbm.2010.11.009,Journal of The Mechani
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Effect of europium(II) stearate on the mechanical properties and the oxidation resistance of UHMWPE
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Luis A. Gallardo
,
Christopher B. Knowlton
,
Joachim Kunze
,
Joshua J. Jacobs
,
Markus A. Wimmer
,
Michel P. Laurent
The objective of this
pilot study
is to investigate the effect of europium(II) stearate additive on the mechanical properties and oxidation resistance of an ultra-high
molecular weight
polyethylene
(UHMWPE), which has been used as an articulating surface in prosthetic devices for many years. It is hypothesized in this study that combining the UHMWPE with lanthanide stearates could enhance oxidation resistance, leading to better preservation of the material’s mechanical integrity.Compression molded UHMWPE was doped at 0, 375 and 750 ppm of europium(II) stearate, γ-irradiated to 35 kGy in a
nitrogen
atmosphere, and accelerated aged in accordance with the ASTM standard F2003-02. Non-irradiated and nonaged samples were used as controls. Miniature samples were comparatively tested for mechanical properties using the small punch test. Oxidation indices (OIs) were obtained through the
FTIR spectroscopy
on
thin film
sections of all irradiated samples.The UHMWPE doped with the europium(II) stearate had the same small punch test curve shape as the conventional UHMWPE control; the ultimate displacement remained unchanged (approximately 4.33±0.02 mm), while the ultimate load and work-to-failure exhibited only small changes (
Journal:
Journal of The Mechanical Behavior of Biomedical Materials - J MECH BEHAV BIOMED MATER
, vol. 4, no. 5, pp. 821-826, 2011
DOI:
10.1016/j.jmbbm.2010.11.009
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