Effect of graphene oxide (GO) on the mechanical properties of ethylene-propylene-diene monomer/acrylonitrile butadiene rubber (EPNBR) blend composites

The article investigates the enhancement of mechanical properties in ethylene-propylene-diene monomer/acrylonitrile butadiene rubber (EPNBR) blends through the incorporation of graphene oxide (GO). It begins by discussing the unique properties of elastomers and the role of vulcanization in determining their elasticity. The study then delves into the synthesis of GO using a modified Hummers method, highlighting the importance of its functional groups in achieving uniform dispersion within the polymer matrix. The compounding procedure for GO-filled EPNBR composites is detailed, emphasizing the two-stage mixing process and the optimal vulcanization conditions. The characterization of the composites includes a range of tests such as cure characteristics, hardness, rebound resilience, tensile and tear strength, stress at 100% elongation, elongation at break, abrasion resistance, swelling resistance, compression set, and morphological analysis. The results reveal that the addition of GO significantly improves the mechanical properties of the EPNBR blends, with optimal performance observed at a GO loading of 5 phr. Beyond this threshold, agglomeration of GO particles leads to a decline in mechanical properties. The article also explores the impact of GO on the crosslink density and swelling resistance of the composites, providing insights into their potential applications in high-pressure, high-temperature environments. The findings suggest that GO-filled EPNBR composites offer superior mechanical performance and durability, making them ideal for demanding sealing applications.