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Current-voltage electrical behavior of in situ microfibrillar carbon black (CB)/poly(ethylene terephthalate) (PET)/polyethylene (PE) (m-CB/PET/PE) composites with various CB concentrations at ambient temperatures was studied under a direct-current electric field. The current-voltage (I-V) curves exhibited nonlinearity beyond a critical value of voltage. The dynamic random resistor network (DRRN) model was adopted to semi-qualitatively explain the nonlinear conduction behavior of m-CB/PET/PE composites. Macroscopic nonlinearity originated from the interfacial interactions between CB/PET micro fibrils and additional conduction channels. Combined with the special conductive networks, an illustration was proposed to interpret the nonlinear I-V characteristics by a field emission or tunneling mechanism between CB particles in the CB/PET microfibers intersections.
Current-voltage electrical behavior of in situ microfibrillar carbon black (CB) / poly (ethylene terephthalate) (PET) / polyethylene (PE) (m-CB / PET / PE) composites with various CB concentrations at ambient temperatures was studied under a direct The current-voltage (IV) curves show nonlinearity beyond a critical value of voltage. The dynamic random resistor network (DRRN) model was adopted to semi-qualitatively explain the nonlinear conduction behavior of m-CB / PET / PE composites. Macroscopic nonlinearity originated from the interfacial interactions between CB / PET micro fibrils and additional conduction channels. An illustration was proposed to interpret the nonlinear IV characteristics by a field emission or tunneling mechanism between CB particles in the CB / PET microfibers intersections.