Electron and proton irradiation of poly(vinylidene fluoride): characterization by electron paramagnetic resonance

摘要

Films of poly(vinylidene fluoride) (PVDF) were exposed to proton and electron beam irradiation at high doses, from 50 to 5000 kGy. Modifications induced in the samples were determined by electron paramagnetic resonance (EPR). Samples irradiated with electrons and protons showed similar behaviours, with the presence of several types of radicals. The number of radicals produced as a function of dose in the proton case is slightly below that of the electron case, indicating non-linear effects. The evolution of radical density and its decay in the dark and in normal light conditions at room temperature was studied, as well as its decay with increase in temperature. When kept in the dark for up to 180 days, no decay of radicals was observed. (C) 2003 Elsevier Science Ltd. All rights reserved. [References: 11]