Mechanical performance and thermal stability of modified epoxy nanocomposite with low loading of graphene platelets

In this study, graphene nanoplatelets (GNP) of 0.2%-1.0% by weight were introduced to the rubber toughened epoxy matrix with via a direct method. The effect of GNP loadings on the mechanical (tensile and impact properties) and thermal properties of the rubber toughened epoxy/GNP nanocomposites were evaluated. The results showed that the incorporation of GNP had optimally improved the tensile strength and tensile modulus by 70% and 74%, respectively, at 0.6 wt% filler loading. Thermogravimetric analysis (TGA) and T-g increment result proved the barrier effect via delaying decomposition process which induced by the layered structure of GNP and thus significantly enhanced the thermal stability of epoxy-based resin, irrespective of GNP loadings (insignificant difference in the decomposition temperature). The fractured surfaces of these nanocomposites showed the good interfacial interaction between the matrix and the GNP nanofiller. X-ray diffraction (XRD) analysis demonstrated the exfoliation and intercalation states of GNP dispersion in epoxy/LENR.

Automated summary

The introduction of graphene nanoplatelets into rubber toughened epoxy matrix showed significant enhancement in mechanical and thermal properties. The incorporation of GNP optimized tensile strength and modulus, while also improving thermal stability and interfacial interaction between matrix and nanofiller. XRD analysis confirmed the dispersion states of GNP in the epoxy/LENR, highlighting the potential of GNP in enhancing composites.