▎ 摘　　要

In-situ polymerization of ethylene with graphene has been previously studied; however, the reported nanocomposites exhibit poor filler dispersion, even at low graphene loadings. In the present work, well dispersed and homogeneous graphene nanoplatelets (GNP)-high density polyethylene (HDPE) nanocomposites were obtained in up to 12.5% weight content of graphene through an in-situ polymerization of ethylene in graphene suspensions. The composites' potential as masterbatches was evaluated by melt mixing them with commercial HDPE. The obtained materials exhibited important physical-mechanical properties increases when compared with those of commercial HDPE. To our knowledge, our materials' GNP concentration (