EPR INVESTIGATIONS OF IRRADIATION EFFECTS ON POLYMERS CONTAINING NITROXIDE SPIN PROBES EXHIBITING A BIMODAL DISTRIBUTION OF MOTIONAL CORRELATION TIMES

The electron paramagnetic resonance (EPR) method employing stable nitroxide radicals as spin probes is becoming increasingly important in the study of molecular motions and morphology in polymeric substances.1 This communication is concerned with a new experimental approach involving γ irradiation and thermal heat treatment techniques for polymers containing nitroxide spin probes that exhibit a bimodal distribution1, 2 of motional correlation times. The implications of these results on the molecular motions of the spin probes and the associated. © 1979, American Chemical Society. All rights reserved.