STUDY OF THE RADICAL SPECIES INDUCED BY ELECTRON-BEAM IRRADIATION IN VACUUM ON BIOMEDICAL UHMWPE

被引:8
作者
Visco, Anna M. [1 ]
Campo, Nino [1 ]
Vagliasindi, Laura I. [2 ]
Tabbi, Giovanni [3 ]
机构
[1] Univ Messina, Ind Chem & Mat Engn Dept, Fac Engn, I-98166 Messina, Italy
[2] Univ Catania, Dept Chem Sci, Catania, Italy
[3] CNR, Biostruct & Bioimages Inst, Support Org Unit Catania, Catania, Italy
关键词
EPR; Free radicals; Irradiation; Mechanical properties; Polyethylene (UHMWPE); MOLECULAR-WEIGHT POLYETHYLENE; CROSS-LINKING; AIR; EPR; DEPENDENCE; ION;
D O I
10.1080/1023666X.2010.510109
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Ultra high molecular weight polyethylene (UHMWPE) is a component of mobile prostheses. The irradiation performed to sterilize and cross-link the polymer limits its life because of the free radicals originated during this process. In this work, a UHMWPE was electron-beam irradiated under high vacuum and annealed. Mechanical tests were performed on the UHMWPE samples before and after the annealing treatment. The results were compared with a study of radical species type and amount and the crystalline degree changes. Experimental results show that the annealing treatment prevents degrading reactions, favors intermolecular and/or intramolecular chemical rearrangements, and improves wear resistance without compromising the typical elasto-plastic mechanical behavior.
引用
收藏
页码:424 / 437
页数:14
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