A series of reduced graphene oxide/polyimide (rGO/PI) nanocomposites are prepared via in situ random co-polycondensation of chemically modified reduced graphene oxide (rGO-NH2) and commercial ODA

ODPA

BPADA

as well as subsequently casting on glasses and thermal imidization.The chemical structure and composition

as well as the microstructure are employed to confirm that GO is chemically modified and further reduced successfully for rGO-NH2.It was found that with the incorporation of rGO-NH2 at 2 wt%

Tg

T5% in N2 and air of the resulting rGO/PI nanocomposites were increased by 17.9 K

32.7 K and 46.7 K

respectively

as well as the tensile strength

modulus and elongation at break increased by 40.6%

16.7%

187.8% in turn compared with neat PI.In addition

water surface contact angle (SCA) of the rGO/PI nanocomposite films reached up to 103.8 with 2 wt% of rGO-NH2.All of these effects of the content of rGO-NH2 are explained to correlate the micromorphology of the resulting nanocomposites.This facile and effective approach provides a possibility for developing homogeneously dispersed

high performance PI composites based on graphene for advanced engineering or functional materials.