Synthesis, mechanical and thermal properties of carbon black/epoxy composites

Abstract

In the present work, epoxy/carbon black (CB) composites were made with 1, 2, 3, 4 and 5 wt. % of CB. The tensile test, flexural test, and impact test of the epoxy/CB composites and neat epoxy were performed and, their results were compared. The results conclude that the tensile strength, flexural strength, and impact strength of the 4 wt. % of CB composites is better than the other composites and neat epoxy. Thermal graphic analysis (TGA) and differential scanning calorimeter (DSC) of the pure epoxy and composites were calculated and analyzed. The results found that the glass transition (Tg) of the neat epoxy was increased with the addition of CB content up to 4 wt. % and then it was decreased. The decomposition temperature of the composites was increased with the increased in the CB content.

Improvement of polyimide/polysulfone composites filled with conductive carbon black as positive temperature coefficient materials

“…The enhancement on thermal properties of the blends would be definitely from the introduction of such high performance PI, possibly originating from PI's aromatic backbone polymer structures. 13,25,26,[33][34][35] The freeze fracture images of the 100PI/0PSF/1CB and 40/60PSF/1CB were shown in Figures 5(e-f). The shift of the two T g s of each component usually depends on the blending composition.…”

“…35 Electrical Properties of PI/PSF/CB Composites The volume resistivity values of CB-filled composites are presented as shown in Figure 6. When introducing CB into the system, the PI phase viscosity could be increased and lead to the increase of the volume fraction needed to achieve cocontinuity.…”

“…48 In the blending system at PSF content ranging from 50 to 70%, the composites exhibited the conductive behaviors. 35 They reported that increasing amount of polymer as the minor phase in partially miscible or immiscible blends with conductive filler could exhibit double percolative behavior. It was clearly seen that for the CB content of 1 wt%, a double percolation effect could occur in the cocontinuous blends at approximately 60 wt% of PSF.…”

“…When CB was added, this obtained cocontinuous phase could be acted as a platform to generate a "double percolation" morphology, being the favorable method in order to decrease the percolation threshold and improve the composite conductivity at lower electrically conductive CB content. 13,25,26,[33][34][35] The freeze fracture images of the 100PI/0PSF/1CB and 40/60PSF/1CB were shown in Figures 5(e-f). They illustrated that CB filler preferred to locate in the PI phase.…”

“…This behavior was also observed by Zhang et al in the system of HDPE/PVDF/carbon nanofiber (CNF). It was due to an addition of stiffer CB into softer 34 CB-filled epoxy, 35 and CB-filled polyurethane. Moreover, the PTC transition temperature region of PI/PSF/CB with heating process was similar to those of second, fifth, tenth, and twentieth heating cycle.…”