Abstract
UDC 544.65
DOI https://doi.org/10.52577/eom.2025.61.4.65
The paper studies the structural and physicochemical properties of binary polymer mixtures based on ethylene-propylene copolymer (EPDN) and nitrile-butadiene rubber (NBR) in order to improve their technological and thermal stability. A comprehensive analysis of the influence of composition and plasticization conditions on the processes of crosslinking, structure formation and thermal-oxidative destruction was carried out. It was experimentally established that an increase in the proportion of NBR promotes the development of a spatial network due to radical reactions activated by double bonds and polar groups. Optimal viscosity, elasticity and gel content are achieved with a ratio of EPDN: NBR = 60:40. The results are confirmed by both spectral and rheological analyses, as well as by calculating the degree of crosslinking using the Flory-Rehner equation. The work demonstrates the potential of targeted modification of EPDSN-containing compositions using reactive elastomers to create heat-resistant and durable polymeric materials.
Keywords: EPDN, polymer mixtures, crosslinking, thermal-oxidative destruction, gelation, structural modification, radical reactions, heat resistance.