Graphene oxide(GO) was obtained by improved Hummers method. Hydrated hydrazine

chitosan

potassium hydroxide was used to prepare different reduced graphene oxide (rGO)

respectively

to choose the best reductant. The rGO was restored and modified by ionic liquid (NH2IL) to obtain functionalized graphene (NH2IL-rGO)

the matrix (MBAE) was prepared from 4

4'-diaminodiphenyl methane bismaleimide in which diallyl bisphenol A (BBA) and bisphenol A bisallyl ether (BBE) were used as reactive diluents

NH2IL-rGO/MBAE composites were prepared from NH2IL-rGO and MBAE via in situ polymerization. The effect of graphene on the properties of composites was studied. The results showed that the micro-morphology of composite existed two-phase structure completely between the matrix and NH2IL-rGO

Graphene gave the material excellent properties. The impact strength and bending strength of composites reached the maximum

15.33 kJ/m2 and 142 MPa

respectively

when the content of NH2IL-rGO was 2%(mass). The thermal decomposition temperature of the composites was 435.73℃

the dielectric constant of the composites abruptly reached 84 when testing frequency range was 100 Hz-10 kHz.