Abstract
The change in polymer structure induced by irradiation with high-energy electrons (6 MeV) was studied for a polymer film of poly(ether sulphone) (PES). This kind of irradiation has been chosen as a method of generating crosslinking and chain-scission. It was found from the measurements of gel fraction that the probabilities of crosslinking and chain-scission depend on the irradiation dose. Sol–gel measurements gave G (crosslinking) = 0.052 and G (chain-scission) = 0.012. Consequently, increasing irradiation dose resulted in higher degree of crosslinking. The correlation between the degree of crosslinking and fluorescence lifetimes has been obtained. Thus, an increase in the degree of crosslinking shifts the distribution of fluorescence lifetimes towards shorter values.
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