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Graphene has been considered an ideal nanoscale reinforced phase for preparing high-performance composites, but the poor compatibility and weak interfacial interaction with the matrix have limited its application. Here a highly effective and environmentally friendly method for the functionalization of graphene is proposed through an interaction between as-exfoliated graphene and (3-aminopropyl) triethoxysilane (KH550), in which 1-butylsulfonate-3-methylimidazolium bisulfate (BSO3HMIm)(HSO4) ionic-liquids-modified graphene was prepared via an electrochemical exfoliation of graphite in (BSO3HMIm)(HSO4) solution, then (BSO3HMIm)(HSO4)-modified graphene as a precursor was reacted with amine groups of KH550 for obtaining (BSO3HMIm)(HSO4)/KH550-functionalized graphene. The final products as filler into carboxylated acrylonitrile‒butadiene rubber (XNBR) improve the dynamic mechanical properties. The improvement in the dynamic mechanical properties of the nanocomposite mainly depends on high interfacial interaction and graphene's performance characteristics, as well as a good dispersion between functionalized graphene and the XNBR matrix. [ABSTRACT FROM AUTHOR]

Graphene oil as an emerging lubricant usually did not achieve the desired lubricity due to the poor interface compatibility of graphene and base oil, especially at harsh friction conditions. Herein, a simple mechanical grinding method was first carried out to fabricate trihexyltetradecylphosphonium bis(2-ethylhexyl) phosphate modified graphene gel ([P 66614 [DEHP]-G) for high-performance additive. The as-prepared [P 66614 [DEHP]-G gel shows the extraordinary thermostability, dispersity and tribological properties even at high load and temperature conditions. TOF-SIMS and Raman analysis on the friction interface reveal the existence of multi-film structure which presents good synergistic lubricating effect thereby improving the tribological behaviors. This paper provides a good strategy to fabricate high-performance oil-miscible graphene composites for reducing the friction and wear under harsh conditions. Image 1 • Trihexyltetradecylphosphonium bis(2-ethylhexyl) phosphate modified graphene gel ([P 66614 [DEHP]-G) was successfully prepared with a simple mechanical grinding method. • The [P 66614 [DEHP]-G displays good thermostability and dispersity in nonpolar hydrocarbon oil (150 N). • The [P 66614 [DEHP]-G significantly enhances the load-carrying capacity of base oil and avoids getting stuck of tribo-pairs under high load and temperature conditions. • The excellent lubricity of [P 66614 [DEHP]-G is ascribed to the formation of multi-film structure (tribo-chemical film and graphene deposition film) which displays high thermostability and synergistic lubricating effect. [ABSTRACT FROM AUTHOR]