Correlation between current-voltage (I-V) characteristic in the electric-thermal equilibrium state and resistivity-temperature behavior of electro-conductive silicone rubber

摘要

In the electric-thermal equilibrium state the current-voltage (I-V) characteristics of conductive silicone rubbers above the percolation threshold are found to be nonlinear. A mathernatic model as I = a(1)U (a(2)U(2) + C) has been built for the nonlinear I-V relations. Constant C and quadratic term a(2)U(2) can be considered as deviation from Ohm's law. For the first time, a correlation is found for conductive silicone rubber between the I-V characteristic in the electric-thermal equilibrium state and the resistivity-temperature characteristic. Samples with positive temperature coefficient (PTC) resistivity effect exhibit negative deviation from linearity, with an I-V relation as I = a(1)U (a(2)U(2) + C). Samples with negative temperature coefficient (NTC) resistivity effect exhibit positive deviation, with an I-V relation as I = a, U + (a(2)U(2) + C). The higher the loaded voltage, the more pronounced the deviation. (c) 2007 Wiley Periodicals, Inc.