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The 129 Xe-NMR method was used for evaluation of the sizes of free volume elements in amorphous glassy materials—random copolymers of tetrafluoroethylene and perfluorodioxoles of different structures. 129 Xe chemical shifts were measured at different pressures up to 1060Torr. The zero pressure chemical shifts obtained by extrapolation were used for calculation of the diameters of microcavities...
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