A study of long-lived free radicals in gamma-irradiated medical grade polyethylene

被引：88
作者：
Jahan, MS [1 ]
King, MC
Haggard, WO
Sevo, KL
Parr, JE
机构：
[1] Univ Memphis, Dept Phys, Memphis, TN 38152 USA
[2] Wright Med Technol Inc, Arlington, TN 38002 USA
来源：
RADIATION PHYSICS AND CHEMISTRY | 2001年 / 62卷 / 01期
关键词：
ultra-high molecular weight polyethylene; radiation sterilization; free radicals; oxidation; thermal annealing;
D O I：
10.1016/S0969-806X(01)00431-5
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Ultra-high molecular weight polyethylene (UHMWPE), used in orthopaedic implants, was irradiated with gamma rays at room temperature (23 degreesC) in air or vacuum, and it was then stored in the same environment for 2 yr at 23 degreesC, 37 degreesC, or 75 degreesC. ESR measurements showed decay as well as changes from alkyl to peroxy and polyenyl radicals in air due to reaction with oxygen. In vacuum, on the other hand, radicals (primarily allyl) decayed without any observable transformation from one type to another. The residual concentrations obtained after 2 yr of post-sterilization storage at 23 degreesC, 37 degreesC, and 75 degreesC were found to be 15-20%, 10-15%, and 2-10%, respectively. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
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页码：141 / 144
页数：4
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