Edge-Selectively Functionalized Graphene-Like Platelets as a Co-curing Agent and a Nanoscale Additive to Epoxy Resin.

摘要

A newly developed method for the edge-selective functionalization of 'pristine' graphite with 4-aminobenzoic acid was applied for the synthesis of 4- aminobenzoyl-functionalized graphite (AB-graphite) through a 'direct' Friedel- Crafts acylation in a polyphosphoric acid (PPA)/phosphorous pentoxide medium (P2O5). The AB moiety at the edge of the AB-graphite played the role of a molecular wedge to exfoliate the AB-graphite into individual graphene and graphene-like platelets upon dispersion in polar solvents. These were used as a co-curing agent and a nanoscale additive to epoxy resin. The physical properties of the resulting epoxy/AB-graphite composites were improved because of the efficient load transfer between the additive and epoxy matrix through covalent links.