Journal of New Technology and Materials
Volume 13, Numéro 1, Pages 70-74
2023-06-25
Investigation Of The Rheological Structural Parameters Of A Network Of Nbr-based Vulcanizates With The Participation Of Chlorine-containing
Authors : Mammadov Shiraz . Azizova Gunel . Khankishiyeva Rana . Amirov Fariz . Mammadova Gunel . Movlayev Ibrahim . Mammadov Jovdat .
Abstract
A new class of active organic crosslinking agents for the vulcanization of NBR on the basis of chlorine-containing compounds (CCAC) has been found, allowing to improve significantly 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+CCAC) was found to be characterized by a bimodal MWD. Abnormally high value of MW/Mns of sol fractions is associated with the bimodal nature of their MWD and indicates the presence of gel in the elastomer. The value of Mη 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.
Keywords
nitrile butadiene rubber ; hexachloroparaxylene ; Mooney viscosity ; sol fraction ; rheology ; crosslinking ; vulcanization ; plasticity
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