Detection of Vitamin E Radicals in Gamma-Irradiated α-T-UHMWPE

摘要

By using high concentration of α-T in UHMWPE resin we were able to observe both α-TO~· and P~· radicals at the same time. Results of this experiment suggest that all P~· radicals can be quenched provided α-T-UHMWPE mixture is irradiated in open air. When the mixture is irradiated in N_2, measurable amount of residual or secondary radicals remain trapped in the polymer matrix, and α-T does not have any effect on them. Furthermore, this study also finds that α-T can easily transform to its own free radical α-TO~· with or without irrardiation.