Abstract
The structure of macromolecules of butadiene-nitrile rubbers with a content of 10, 15, 18, 26 and 40 wt. % of bound nitrile of acrylic acid was studied using 1H and 13C NMR spectroscopy. The effectiveness of using the nuclear magnetic resonance method on 1H and 13C spectroscopy for the analysis of the microstructure of the butadiene link in butadiene-nitrile rubbers was demonstrated. Calculation formulas for the quantitative assessment of the bound nitrile of acrylic acid, 1,2-, trans-1,4- and cis-1,4-units were proposed. There was a discrepancy between the calculation results for 1H and 13C NMR data. It was shown that the calculation of the conformation-isomeric composition of the butadiene link according to the 13C NMR spectra is possible only in the strong field region, since the signals of N-phenyl-β-naphthylamine, used as an antioxidant, overlap the signals of 1,2-, trans-1,4- and cis-1,4-links in the weak field region. The presence of a junction of acrylonitrile and butadiene units according to the type of 1,2-addition in rubbers with a content of bound nitrile of acrylic acid of 26 and 40 wt. % – but absent in rubbers with a lower content – was shown.
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