Time dependences of conduction and self‐heating in acetylene carbon black‐filled high‐density polyethylene composites

Abstract

ABSTRACT:The time dependences of electrical conduction and self-heating behaviors in high-density polyethylene filled with acetylene carbon black of 0.082 in volume fraction are studied in relation to voltage and ambient temperature. The characteristic decay current constant i , and the exponential growth time constant for self-heating g are determined for the samples under voltages U above the critical value U c for the onset of self-heating. The influences of voltage and ambient temperature on i and g as well as the amplitude of the low-resistance to high-resistance switching are discussed on the basis of the random resistor network (RRN) model and the relationship between U c and the intrinsic resistivity.

Styrene–butadiene–styrene copolymer compatibilized carbon black/polypropylene/polystyrene composites with tunable morphology, electrical conduction and rheological stabilities

“…Conductive polymer composites are usually produced by incorporating conducting llers like carbon black (CB) into polymer matrices. For application in many elds such as electromagnetic interference shielding and self-regulating heater, [1][2][3][4][5] a high volume fraction of CB is usually required to achieve high electrical conductivity, which may result in degenerated mechanical properties, poor processability and high cost. [6][7][8][9] Reduction of CB loading is thus of technical and economic importance.…”

Influence of irradiation crosslinking on the self‐heating and conduction of an acetylene carbon black filled high‐density polyethylene composite in the electric–thermal equilibrium state

“…This leads to a global resistance increase with time until a switched electric–thermal equilibrium state is reached 15. In the electric–thermal equilibrium state, the rates of heat generation and heat dissipation are equal, so both the current passing through the sample and the sample temperature due to self‐heating do not vary with time 10, 16–18. In a nonlinear current density/electric field ( J – E ) plot, a maximum value of the current density ( J ) reveals the global breakdown of the electrical contact between the particles 19–21.…”

“…In a nonlinear current density/electric field ( J – E ) plot, a maximum value of the current density ( J ) reveals the global breakdown of the electrical contact between the particles 19–21. The dynamic process of conduction switching has attracted considerable attention in recent years 10, 11, 16–24…”