Study of the rheology of the ternary ethylene-propylene rubber with modified phenol-formaldehyde oligomers and the properties of filled composite materials based on them

The presented study demonstrates that modifying ternary ethylene-propylene rubber (SKEPT-60) with chlorine-containing compounds enhances its adhesion, slow vulcanization rate, and compatibility with unsaturated rubbers.To further improve its properties, the rheological and structural characteristics of binary systems obtained by incorporating benzylamine-modified phenol-formaldehyde oligomer in various ratios were investigated.The results showed that the structure of SKEPT-60 allows for significant structural modifications, improving several performance parameters.Filled compositions based on SKEPT-60 modified with different proportions of benzylamine-modified phenol-formaldehyde oligomer were prepared and analyzed, revealing enhanced properties.The rheological behavior of binary mixtures at different temperatures (100, 120, 150, and 170C) and under varying loads (11.75, 20.85, 27.35, and 35.30kg) was studied after vulcanization (1552C for 35 minutes).Following vulcanization, samples were extracted separately in acetone and toluene for 18 hours to determine sol-gel fractions.Subsequent to these treatments, composite materials were fabricated from the modified SKEPT-60 mixtures and evaluated for mechanical and technological properties.The findings confirm that modifying SKEPT-60 with benzylamine-modified phenolformaldehyde oligomer effectively enhances the overall performance of the rubber, making it more suitable for demanding applications requiring improved adhesion, thermal stability, and compatibility with other elastomers.This approach highlights the potential of functional oligomer modification in developing advanced rubber-based composites