Interplay between electron affinity and free volume on positronium formation in polyimidesReportar como inadecuado




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Abstract : Our recent PAL results on a series of polyimides Pl are summarized. It is shown that Pls are properly grouped according to whether there is long-lived o-Ps or not, and that those that do not produce o-Ps have strong electron affinities. Secondly the pore size was changed by ex-posing Pls to 50 atm CO2 gas. I3 was increased substantially for the Pls that have moderate I3 values. For the Pls that have large o-Ps yield the increase in I3 was small, and for those having no o-Ps the o-Ps component did not appear. In a third experiment where the pore structure was changed by introducing vapor molecules, both MATH3 and I3 were reduced. This contrasts to low density polyethylene for which , τ3 and I3 were increased. These results are viewed as an aspect of the spur model in which both electron affinity and pore size are affecting Ps formation.





Autor: Y. Ito K.-I. Okamoto K. Tanaka

Fuente: https://hal.archives-ouvertes.fr/



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