V. A. Shershnev

Ozone resistance of crosslinked blends of butadiene-acrylonitrile and ethylene-propylene-diene elastomers and interphase interaction in these blends

The relation of ozone resistance to the volume and structure of the interphase layer and the amounts of crosslinks in the interlayer was studied for covulcanizates of butadiene-acrylonitrile rubbers of various polarities with ethylene-propylene-diene (EPDM) elastomers that differed in the comonomer composition and stereoregularity of propylene units. It was shown that the ozone resistance is determined by the compatibility of the components, the interlayer volume and density, the amount of crosslinks in the interlayer, and the strength of the EPDM network.

Structure of the interfacial layer and properties of crosslinked heterophase blends based on butadiene-nitrile and ethylene-propylene-diene elastomers

The density of the interfacial layer and the number of formed crosslinks have been estimated by means of swelling in selective solvents for heterophase blends of butadiene and ethylene-propylene elastomers. Ethylene-propylene-diene elastomers are characterized by an increased content of ethylene units and diene groups, a higher degree of isotacticity of propylene chain fragments, and a higher Mooney viscosity at low stereoregularity of the propylene units. The effects of the above parameters on the interfacial interaction and the kinetics of ozone degradation of the diene matrix have been studied.