Positronium lifetime in porous VP-DVB copolymer

摘要

Porous 1-vinyl-2-pyrrolidone-divinylbenzene copolymer was studied using Positron Annihilation Lifetime Spectroscopy. A set of spectra measured at various temperatures was analysed using two methods: model parameters fitting and quantified maximum entropy. Similarity of the results obtained by entirely different methods ensure that distortion of the results arisen from inappropriate data processing was minimized.rnTemperature dependence of the experimental ortho-posi-tronium lifetimes was compared to predictions of the Extended Tao-Eldrup model. Very good agreement in whole temperature range was found for empirical parameter A = 0.15 nm. Basing on PALS data and the Extended Tao-Eldrup model the distribution of free volume sizes was derived.