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In situ shear-induced mercapto group-activated graphite nanoplatelets for fabricating mechanically strong and thermally conductive elastomer composites for thermal management applications

2018; Elsevier BV; Volume: 112; Linguagem: Inglês

10.1016/j.compositesa.2018.06.004

1878-5840

Yinhang Zhang, Soo‐Jin Park,

Graphene research and applications

Interfacial interaction is one of the most crucial and dominant factors affecting the performance and behavior of a material. The surfaces of layered expanded graphite (EG) were activated by covalently grafted mercapto groups (-SH), which can readily react with the macromolecular chains of rubber, thus forming a strong interfacial adhesion between the filler and the rubber matrix. Shear-induced mercapto-group-activated graphite nanoplatelets ([email protected]) were fabricated in situ by compound mixing in a two-roll mill. A correlation between the interfacial interaction and the thermal conductivity, as well as the thermo-physical properties, was comprehensively investigated. The results showed that rubber/[email protected] composites exhibited better mechanical performance, enhanced thermo-physical properties, and superior thermal conductivity, all of which could be attributed to the stronger interfacial interaction resulting from chemical bonding between the [email protected] and the molecular chains of the rubber, relative to XSBR/GNP composites connected by weaker π-π stacking.