Some problem questions in studying the properties of dynamically vulcanized polymer systems based on ethylene/1-hexene copolymer and nitrile butadiene rubber.

The article focuses on the study of the influence of nitrile butadiene rubber (NBR) type and concentration on the physical and mechanical properties of polymer compositions based on compatibilized ethylene/1-hexene copolymer (EHC*). Using SKN-18, SKN-26, and SKN-40 grades of NBR and polyethylene-graft-methacrylic acid (PE-g-MAA) as a compatibilizer, the research found that increasing NBR content leads to decreased strength, heat resistance, and melt flow rate, with phase inversion occurring at 30 wt% for SKN-18 and 40 wt% for SKN-26 and SKN-40. Thermomechanical and dilatometric analyses revealed changes in deformation behavior and crystallization mechanisms, including the formation of thermoplastic elastomers exhibiting rubber-like elasticity. Additionally, dynamic vulcanization with dicumyl peroxide (DP) improved strength and elongation, with 0.5 wt% DP identified as optimal for maintaining processability. These findings provide insights into tailoring polymer blends for applications requiring combined rubber properties and thermoplastic processability.