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

Table 1

Relative concentration of radicals, spin 1/2 coupling constants, % lorentzian, and line width for 100 kGy irradiated pristine UHMWPE and vitamin E blended UHMWPE powder used as input for WinSim simulation software.

Sample/radical	Pristine UHMWPE			Vitamin E blended UHMWPE
	Alkyl	Allyl	Polyenyle	Allyl	Polyenyle	Vitamin E
Rel. Conc.	5.30%	68.10%	26.60%	43.20%	42.40%	14.40%
Hα1	1 @ 23.1 G	1 @ 5.9 G	—	1 @ 5.7 G	—	—
Hα2	4 @ 31.7 G	2 @ 17.2 G	—	2 @ 18 G	—	3 @ 4.9 G
Hβ1	—	2 @ 23.6 G	—	2 @ 26 G	—	—
Hβ2	—	2 @ 12.7 G	—	2 @ 15 G	—	3 @ 6.3 G
G-shift	−3.70	−3.15	−10.5	−5.5	−11.5	−7.03
% lorentzian	0	93	7	100	59	0
Line width (G)	5.26	4.3	18	4.3	19.5	2.5