Effect of functionalized graphene on mechanical properties and dielectric constant of bismaleimide composites

Abstract

Graphene oxide was obtained by improved Hummers method. Hydrated hydrazine, chitosan or potassium hydroxide was used to prepare different reduced graphene oxide (rGO) in order to choose the best reductant, respectively. The rGO was restored and modified by ionic liquid (NH 2 IL) to obtain functionalized graphene (NH 2 IL-rGO), the matrix (MBAE) was synthesized from 4,4′-diamino diphenyl methane bismaleimide modified by diallyl bisphenol A and Bisphenol A bisallyl ether. NH 2 IL-rGO/MBAE composites were prepared from NH 2 IL-rGO and MBAE via in situ polymerization, and also studied the effect of NH 2 IL-rGO on the properties of composites. The results showed that the micro-morphology of composite existed twophase structure between the matrix and NH 2 IL-rGO, which gave the material excellent properties. The impact strength and bending strength of the composite reached the maximum and were 15.33 kJ/m 2 and 142 MPa, respectively, when the content of NH 2 IL-rGO was 2 wt%. The thermal decomposition temperature of the composite was 435 °C, the dielectric constant of the composite abruptly reached 84 in the frequency range 10 2 ~ 10 5 Hz.

Benzoxazine Containing Fluorinated Aromatic Ether Nitrile Linkage: Preparation, Curing Kinetics and Dielectric Properties

“…With the development of science and technology, thermosetting resins play an important role in electronics, substrate materials, aeronautics-aerospace industry and new energy applications. Thermosetting resins, like epoxy, cyanate ester, phthalonitrile, bismaleimide and so on, due to the advantages including high specific strength and compressive strength, corrosion resistance, electrical properties, light weight, high glass transition temperature ( T g ) and outstanding bonding properties were intensively investigated and applied in many high-tech areas [1,2,3,4,5]. For applications in particular areas and human encountered with energy crisis, polymer-based materials with easy processing were widely used to replace the conventional metal materials to reduce the weight and decrease the costs [6,7].…”

Enhanced mechanical properties of bridged graphene oxide/bismaleimide nanocomposites

“…Few previous studies have achieved such a dramatic improvement in the impact strength of modified BMI with the addition of extremely low amounts of graphene‐based nanofillers. Figure 12 listed some of the previous work, the comparatively optimal impact strength of other graphene‐based nanofiller modified BMI was 26.19 kJ/m 2 at 0.3 wt% loading of fillers currently 2,28,29,31,33,45–51 . However, we found that the optimal impact strength of this work was 29.06 kJ/m 2 just at 0.05 wt% loading of MAH‐GO.…”