Novel electroactive polyamide 12 based nanocomposites filled with reduced graphene oxide

Abstract

Novel electroactive nanocomposites were prepared by adding to a polyamide 12 (PA12) matrix different amounts (from 1 to 8 wt%) of reduced graphene oxide (rGO), and the thermo-electrical behavior of the prepared bulk materials was compared with that of the corresponding fibers. FESEM micrographs on bulk materials highlighted an evident aggregation of the rGO lamellae, proportional to the filler concentration. The presence of rGO stacks was responsible of a heavy embrittlement of the samples, with a strong reduction of the elongation at break, and of the limited electrical conductivity of the samples (about 10 5 XÁcm with a rGO amount of 4 wt%). Moreover, nanofiller addition determined an improvement of the thermal degradation resistance, associated to a slight drop of the glass transition temperature (about 78C with a nanofiller concentration of 4 wt%) and of the crystallinity degree (up to 9% for an rGO loading of 4 wt%). The extrusion process adopted to prepare nanocomposite fibers caused a partial breakage of rGO aggregates and their progressive alignment along the drawing direction, determining thus an electrical resistivity increase with respect to the bulk samples. Therefore, the surface heating of the prepared fibers through Joule effect was possible only at elevated rGO amounts (i.e., 8 wt%). POLYM. ENG. SCI., 00:000-000, FIG. 9. Surface temperature evolution of the PA12-rGO-8 fiber with DR 5 3 with an applied voltage of 200 V and 220 V.

Reduced graphene oxide reinforced PET/PBT nanocomposites: Compatibilization and characterization

“…The presence of rGO aggregates may show that the shear stresses during the extrusion process were not able to break and disperse the aggregates. The similar result reported by Dorigato and Pegoretti for PA12‐rGO nanocomposites 49 . Also, when Figure 8B‐2 is examined, it was seen that rGO nanoparticles pulled out the matrix during the tensile process and there are interfacial debonding can be seen.…”

“…The similar result reported by Dorigato and Pegoretti for PA12-rGO nanocomposites. 49 Also, when Figure 8B-2 is examined, it was seen that rGO nanoparticles pulled out the matrix during the tensile process and there are interfacial debonding can be seen. These may be due to the weak interfacial adhesion between the PET/PBT and rGO.…”

Chemically Functionalized Reduced Graphene Oxide as Additives in Polyethylene Composites for Space Applications

“…An emerging approach to enhance mechanical and electrical properties of polymers during melt processing is to incorporate 2D graphene structures to form a nanocomposite [11,[13][14][15][16][17][18] . The efficacy of this approach is perhaps most limited by the miscibility of the graphene structures with matrix polymers, a topic that has become the focus of many studies and reviews [19][20][21][22][23][24][25] .…”

Influence of Manufacturing Parameters and Post Processing on the Electrical Conductivity of Extrusion-Based 3D Printed Nanocomposite Parts

“…As a result of the higher degree of swelling obtained in filaments extruded with the conical output extrusion die, ABS matrix moves to the surface of the filament creating a thin insulating layer, with the consequent decrease in electrical conductivity. Additionally, orientation of the GNPs along the extrusion axis occurs, and this is more effective when using higher extrusion speed rates and higher temperatures, i.e., lower viscosities [28][29][30].…”