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In this work, we prepared (co-)polyethylene/graphene oxide nanocomposites by in situ Ziegler-Natta polymerization.First, we treated graphene oxide with grignard agent,and then added active transition metal compound TiCl4 to produce the graphene oxide(GO) supported catalyst.Subsequent (co-)polymerization led to the in situ formation of (co-)polyethylene/graphene oxide nanocomposites.