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Abstract
The effect of γ-irradiation on the thermal and mechanical properties of ultra-high molecular weight polyethylene (UHMWPE) used in orthopedic implants was investigated. UHMWPE was recrystallized with different cooling conditions for the purpose of enhancing the crosslinking extent of the polymer after γ-irradiation. UHMWPE was irradiated with γ-ray to a dosage of 10–500 kGy in air and nitrogen atmosphere. Differential scanning calorimetry, tensile characterization, creep deformity and wear were examined to determine the mechanical properties of the irradiated UHMWPE specimens. The crystallinity of the irradiated samples was increased with irradiation dose. The irradiated UHMWPE after recrystallization in a quenching condition had a higher crosslinking extent compared with the irradiated UHMWPE after slowly cooling. The irradiated UHMWPE after quenching had a lower wear rate than the irradiated UHMWPE after recrystallization in a slowly cooling condition, and the wear rate of UHMWPE decreased with irradiation dose up to 250 kGy, which was about 40% of the wear rate of nonirradiated UHMWPE.
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