Investigation into microstructure of butadiene nitrile rubbers by NMR1H spectroscopy

The effect has been studied of the paramagnetic shifting reagent europium tris-(1,1,1,2,2,3,3-heptafluoro-7,7-dimethyl-4,6-octanedionate), Eu(fod)3, on the NMR-1H spectra of butadiene nitrile rubber. A change of the ratio Eu(fod)3: substrate makes it possible to follow a change in the paramagnetic shift value with increasing concentration of Eu(fod)3 in the solution. The signals in the copolymers spectra have been assigned according to the triad theory, and the quantitative data about the triad content in rubbers have been given