Tong Gang, Tian Hua, Wang Caimei, Wang Gang
Department of Orthopedics, Peking University Third Hospital, Beijing 100191, China.
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Zhonghua Yi Xue Za Zhi. 2015 Jun 2;95(21):1695-7.
To explore the optimal condition of crosslinking modification of ultra high molecular weight polyethylene (UHMWPE) by gamma ray irradiation.
The hip and knee joint samples of UHMWPE were tested with regards to friction and wear performance at different doses of (60)Co radiation and heat treatment. And the optimal condition of crosslinking was determined by wear performance and physicochemical properties.
Under the condition of 75 kGy irradiation and 150 °C heat treatment, crosslinked UHMWPE showed the best performance. Acetabular sample wear rate decreased 63.24% and knee sample wear rate decreased 59.95% compared with conventional UHMWPE. The modified material had excellent mechanical properties of impact strength 83 kJ/m², tensile strength 50.32 MPa, yield strength 21.83 MPa and elongation at break 312%. Also the material showed excellent antifatigue and reliable chemical properties.
The optimal condition of crosslinking modification of UHMWPE is 75 kGy irradiation after 150 °C heat treatment.
探讨γ射线辐照超高分子量聚乙烯（UHMWPE）交联改性的最佳条件。
对UHMWPE髋关节和膝关节样本在不同剂量的钴-60辐射及热处理条件下进行摩擦磨损性能测试。通过磨损性能和物理化学性质确定交联的最佳条件。
在75千戈瑞辐照和150℃热处理条件下，交联UHMWPE表现出最佳性能。与传统UHMWPE相比，髋臼样本磨损率降低63.24%，膝关节样本磨损率降低59.95%。改性材料具有优异的力学性能，冲击强度83千焦/平方米，拉伸强度50.32兆帕，屈服强度21.83兆帕，断裂伸长率312%。此外，该材料还具有优异的抗疲劳性能和可靠的化学性质。
UHMWPE交联改性的最佳条件是150℃热处理后进行75千戈瑞辐照。
