▎ 摘　　要

Efficient production of high-quality, functionalized graphene is highly desirable for large-scale applications of graphene. Herein, a route for producing high-quality, polystyrene (PS)-functionalized graphene is demonstrated via graphite exfoliation in chloroform with a heterobifunctional hyperbranched polyethylene, HBPE@Py@PS, as stabilizer. The HBPE@Py@PS, possessing a pyrene-functionalized hyperbranched polyethylene backbone and multiple PS side chains, is synthesized by combining chain walking polymerization and atom transfer radical polymerization techniques. It is confirmed that the HBPE@Py@PS can effectively promote graphite exfoliation in chloroform under sonication to render stable dispersions of high-quality graphene, with an exfoliation efficiency high as 15% and a monolayer proportion, 61%. Meanwhile, it can irreversibly adsorb on the exfoliated graphene surface based on the - stacking interactions, concurrently rendering PS-functionalized graphene that is fluorescent and highly dispersible in chloroform, with a film conductivity reaching 1100 S m(-1). The as-produced graphene may find its applications as nanofiller for various PS-based graphene nanocomposites.