Amino functionalization of graphene/graphene-like MoSe_2 hybrids as lubricant additives for bismaleimide composites: Preparation, mechanical and tribological properties

摘要

Amine functionalization of graphene/graphene-like MoSe2 (NH2-rGO/MoSe2) hybrid nanosheets were synthesized by a facile hydrothermal method. Then, as lubricant additives, the hybrids were doped into bismaleimide (BMI) matrix to reinforce the mechanical and tribological properties of BMI composites. Graphene-like MoSe2 was introduced into rGO to prevent re-stacking of the layers. The microstructure of NH2-rGO/MoSe2 was also characterized. When the content of NH2-rGO/MoSe2 was 0.6 wt.%, the composite could achieve the highest impact and flexural strengths of 19.3 kJ/m(2) and 167.2 MPa, respectively. For the 0.4 wt.% NH2-rGO/MoSe2/BMI composite, it reached the minimum values for coefficient of friction and volume wear rate of 0.22 and 2.03 x 10(-6) mm(3)/(N.m), decreased by 47.6% and 87.6% in comparison with those of pure BMI, respectively. The NH2-rGO/MoSe2 hybrids, acting as solid lubricants, played a key role in the enhanced toughness of the composites and interfacial strength between BMI matrix and filler. Thus, the improved tribological properties of the NH2-rGO/MoSe2/BMI composites were obtained.