▎ 摘　　要

Polyimide(PI)/graphene oxide(GO) nanocomposite films were prepared by chemical crosslinking using small amounts of divalent Mg ions. The PI/GO nanocomposites showed enhanced tensile properties compared to pristine PI due to the presence of exfoliated GO in the PI matrix as well as crosslinking between poly(amic acid) (PAA), which is a precursor of PI, and GO by Mg ions. The hydrogen bonds between PM and GO suppressed the phase separation between PI and GO, and small amounts of Mg ions can bond between the oxygen functional groups and carboxylate groups of GO and PM. (C) 2012 Elsevier Ltd. All rights reserved.