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首页> 外文期刊>Journal of Applied Polymer Science >Effect of electron beam irradiation on physical properties of ultrahigh molecular weight polyethylene
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Effect of electron beam irradiation on physical properties of ultrahigh molecular weight polyethylene

机译：电子束辐照对超高分子量聚乙烯物理性能的影响

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摘要

If a large amount of polymer radicals remain trapped after the irradiation of ultrahigh molecular weight polyethylene (UHMWPE), the radicals may result in a significant alteration of its physical properties during long-term shelf storage and implantation. An electron spin resonance spectroscopic study was undertaken to investigate the remaining free radicals in UHMWPE after electron beam irradiation tip to 500 kGy in air and an N-2 environment. Heat treatment was employed at 110 and 145° C for various periods of time to decay the free radicals. The free radicals were rapidly decayed for 1h and gradually decayed as a function of lime with the heat treatment. The decay of the free radicals was completed more rapidly with a heat treatment at 145° C than at 110° C. Therefore, a longer heat treatment time is required to scavenge all the free radicals formed in UHMWPE at 110° C. The oxidation profiles showed that the oxidation index of the heat-treated UHMWPE was lower than the oxidation index of the non-heat-treated UHMWPE. The heat treatment of irradiated UHMWPE can substantially reduce the concentration of free radicals; therefore, UHMWPE has resistance against long-term oxidative degradation. © 2005 Wiley, Periodicals, Inc.
机译：如果在超高分子量聚乙烯（UHMWPE）辐照后仍有大量聚合物自由基被捕获，则这些自由基可能会导致长期货架存储和植入过程中其物理性能发生重大变化。进行了电子自旋共振光谱研究，以研究在空气和N-2环境中电子束辐照达到500 kGy后UHMWPE中的剩余自由基。在110和145℃进行热处理。 C在不同的时间段内会分解自由基。自由基迅速分解1h，并随着热处理而逐渐分解为石灰的函数。通过在145＆DEG进行热处理，自由基的分解得以更快地完成。 C比110＆DEG高;因此，需要更长的热处理时间以清除UHMWPE在110℃下形成的所有自由基。氧化曲线表明，热处理过的UHMWPE的氧化指数低于未热处理过的UHMWPE的氧化指数。辐照的UHMWPE的热处理可以大大降低自由基的浓度;因此，UHMWPE具有抵抗长期氧化降解的能力。 ＆复制; 2005年Wiley，Periodicals，Inc.

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