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The deviation of the equilibrium degree of swelling of nitrile-butadiene and ethylene-propylenediene rubbers (NBR and EPDM, respectively) in the selective n-heptane solvent (the Zapp method) from the additive values, which characterizes the density and volume of the interphase layer, was determined. This quantity was correlated with the free volume fraction in the defects of the NBR structure formed...
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