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In order to realise the potential of graphene nanocomposites it is vital tocontrol the degree of dispersion and achieve a strong graphene polymerinterface. Herein, we developed a facile grafting to functionalisation approachfor graphene nanoplatelets. NH2-terminated graphene nanoplatelets, NH2 GNPs,prepared by a diazonium coupling were used as a platform to covalently graftPMMA chains to the surface of graphene through an amidation between the NH2groups and PMMA chains, PMMA NH GNPs. A degree of PMMA grafting of 3.8 wt, onechain per 40 carbon atoms, was found to both improve the dispersion of the GNPsin a PMMA matrix and give strong graphene-polymer interfaces compared toas-provided GNPs. Thus, 2 wt of PMMA NH GNPs in PMMA was found to increase theelastic modulus, strength and strain at break of PMMA, whereas theincorporation of unmodified GNPs showed poor levels of reinforcement at allloadings. Furthermore, Tg and Td of PMMA were increased by 15 C and 29 C,respectively, by adding 5 wt of PMMA NH GNPs, whereas incorporating unmodifiedGNPs led to smaller increases. This work offers the possibility of controllingthe properties of graphene-polymer composites through chemically tuning thegraphene-polymer interface, which will have broad implications in the field ofnanocomposites.

PMMA-grafted graphene nanoplatelets to reinforce the mechanical and thermal properties of PMMA composites