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The nature of sites of absorption of low-molecular-mass compounds by butadiene–acrylonitrile copolymers

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Abstract

The rotational mobilities of the paramagnetic probes TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl) and BZONO (4-benzoate-2,2,6,6-tetramethylpiperidine-1-oxyl) are studied via EPR spectroscopy and the equilibrium swelling of random and multiblock butadiene–acrylonitrile copolymers of various compositions and stereostructures of butadiene units in n-heptane, methyl acetate, and toluene are studied. The nature of defective regions sorbing low-molecular-mass compounds is ascertained. The rotational mobilities of the probes in defects of various structures are estimated. The sites of sorption are found to be identical in crosslinked and noncrosslinked elastomers. It is shown that the sorption of n-heptane and methyl acetate appears in the same defective regions as those of the TEMPO radical, while the sorption of toluene emerges in sorption sites where the value of free volume is sufficient for the sorption of the bulky radical BZONO. A decay in local molecular mobility in structural defects (“holes”) does not hinder the absorption of lowmolecular- mass compounds if the free volume is sufficient.

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Correspondence to N. M. Livanova.

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Original Russian Text © N.M. Livanova, S.G. Karpova, L.A. Kovaleva, N.Ya. Ovsyannikov, A.A. Popov, 2016, published in Vysokomolekulyarnye Soedineniya. Ser. A, 2016, Vol. 58, No. 2, pp. 121–130.

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Livanova, N.M., Karpova, S.G., Kovaleva, L.A. et al. The nature of sites of absorption of low-molecular-mass compounds by butadiene–acrylonitrile copolymers. Polym. Sci. Ser. A 58, 130–138 (2016). https://doi.org/10.1134/S0965545X16020127

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  • DOI: https://doi.org/10.1134/S0965545X16020127

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