On the Structural Analysis of -Ray Induced Primary Free Radicals in UHMWPE and Vitamin E Stabilized UHMWPE by ESR Spectroscopy

Figure 8

ESR spectrum plotted as a function of oxidation time in air for 678 hours: (Sample A) virgin UHMWPE powder 100-kGy irradiated; (Sample B) vitamin E blended UHMWPE powder 100-kGy irradiated; (Sample C) virgin UHMWPE powder 65-kGy irradiated; (Sample D) vitamin E blended UHMWPE powder 65-kGy irradiated. ^*(Note: all the spectra are on the same -axis scale except Sample B. The scale of Sample B is twice the all other samples in the figure).

(a)

(b)

(c)

(d)