A new class of active organic crosslinking agents for the vulcanization of NBR based on halogenmethyl-containing compounds has been found, allowing improvement significantly in the rheological and structural parameters of NBR. Gel content and Mooney viscosity in binary systems after plastification on rollers were studied. The sol fraction of cross-linked NBR (SKN-40+TCMCC) was found to be characterized by a bimodal MWD. Abnormally high value of _W/n_s of sol fractions is associated with the bimodal nature of their MWD and indicates the presence of gel in the elastomer. The value of _η of the sol fractions in cross-linked NBR was found to be insignificant. The sol fraction of cross-linked HCPX elastomer was shown to have lower values of the specified parameters and lower content of high-molecular-weight fractions. The branching density ρ of macromolecules of sol fraction of cross-linked NBR was 1.90-2.3·10^-3, i.e. on average corresponded to one monomer unit and two hundred branching nodes per molecule

doi.org/10.32737/0005-2531-2023-4-91-96