Relation of gas transport parameters of amorphous glassy polymers to their free volume: positron annihilation studyстатья
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Дата последнего поиска статьи во внешних источниках: 11 мая 2017 г.
Аннотация:Correlations of transport parameters (diffusion coefficients D and permeabilities P of gases) and thermodynamic parameters (solubility coefficients S and parameters of sorption isotherms) with the sizes of free volume elements, vh, as estimated via positron annihilation lifetime spectroscopy are analyzed for the first time on the basis of the data array obtained for glassy polymers. Correlations of and with 1/vh that agree with the free volume model under the condition of a weak change in the concentration of free volume elements in different polymers are ascertained. Certain deviations from linear correlations with 1/vh for polymers with high free volumes are interpreted as evidence that the connectivity (openness) of pores increases with the sizes of free volume elements. For solubility coefficients and Langmuir parameters of sorption capacity, good linear correlations with the value of vh are demonstrated.