▎ 摘　　要

Polymers modified by graphene have become an attractive method to enhance the matrix properties, wherein the dispersion of graphene in the matrix and the interfacial interactions between graphene and matrix are critical to influence the final performance. In the present work, graphene nanosheet (GNS)-modified hydrogenated nitrile butadiene rubber (GNS/HNBR) composites were prepared via solution-mixing and mechanical-blending methods. The curing performance, mechanical properties and heat resistance of the prepared composites were - studied. The results showed that when the content was 0.2 wt%, the tensile strength and modulus at 300% elongation of the GNS/HNBR composite prepared via solution-mixing method reached 19.36 and 3.62 MPa, which increased by 32% and 18% compared with those of pure HNBR, respectively. In addition, the swelling index of the composite in cyclohexane was decreased from 413% to 337%. On the other hand, the tensile property of GNS/HNBR composite prepared by mechanical-mixing method became poor. SEM observation showed that GNS was well dispersed and incorporated into HNBR via the solution-mixing method, resulting in a significant reinforcing effect.