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fewer free radicals, better mechanical characteristics, and lower wear than remelted XPE.
33%
261/783
fewer free radicals, worse mechanical characteristics, and lower wear than remelted XPE.
12%
94/783
more free radicals, better mechanical characteristics, and equivalent wear than remelted XPE.
38%
300/783
more free radicals, worse mechanical characteristics, and equivalent wear than remelted XPE.
6%
49/783
equivalent free radicals, better mechanical characteristics, and lower wear than remelted XPE.
8%
65/783
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Cross-linking polyethylene with radiation improves the wear properties. Persistent free radical formation within the crystalline areas of polyethylene can become oxidized in vivo. Remelting (heating above the melting point) or annealing (heating below the melting point) are processing techniques that decrease the retained free radicals. The advantage of remelting is more complete removal of persistent free radicals compared with annealing. The advantage of annealing is improved mechanical properties by avoiding disruption of the crystalline areas that occurs with remelting. Other free radical squelching methods (eg, addition of the free radical scavengers such as vitamin E) are being used to achieve both goals (free radical removal and maintenance of improved mechanical properties). To date, no significant difference has been demonstrated in wear rates between the two materials.
2.9
(27)
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