Abstract
AbstractUntreated polymethylmethacrylate (PMMA) as well as PMMA into which charges were injected (PMMA‐electret) were studied by positron annihilation techniques (PAT). A comparison of the PAT data with previously reported results obtained via different techniques including thermally stimulated discharge (TSD) shows good agreement and suggests that the observed effects can be explained by the onset of different types of molecular motions in the polymer. It appears that in the case of the PMMA‐electret an additional transition at 130 K can be identified which may be correlated with a different type of molecular motion, presumably with the rotation of the methyl group of the ester side chain.
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