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In this work, linear polystyrene-poly(2-vinylpyridine) (PS-b-P2VP) andheteroarm star PS_22P2VP_22 ionizable block copolymers were used as dispersingagents for the liquid-phase exfoliation of pristine graphene. Variousstrategies such as direct exfoliation, film hydration and phase transfer havebeen employed and compared. The best strategy involved a two-step process,namely, pre-exfoliation of graphite in polymer/CHCl3 solutions followed byphase transfer to acidified water. High concentrations of stable aqueoussuspensions of graphene flakes, highly enriched in monolayer structures, werethen obtained by using the star-shaped copolymers as stabilizers. Theas-prepared graphene/copolymer hybrids were used as a filler material in orderto prepare functional polymer composites for mechanical reinforcement. Suchcopolymer-modified graphene sheets have proven to be efficient reinforcingagents of PVA, as a significant increase of storage modulus (145% higher thanthat of neat PVA) was achieved even at a low graphene weight fraction of 0.1wt%.

Colloidal stabilization of graphene sheets by ionizable amphiphilic block copolymers in various media