Abstract
It is important to understand temperature dependence of electrical conductivity for polar rubber, which is utilized for charging members of an electrophotographic apparatus. The temperature dependence measurements of AC conductivity were investigated for NBR compounds. The conditions for the measurements were as follows; the sample was fixed between the electrodes with 40kPa, AC voltage: ±70V at various constant frequencies, temperature: from - 50°C to 100°C at a heating rate of 4°C/min. in a dry N2 stream. AC conductivity was used the reciprocal of the real part of admittance. As a result the conductivity was in proportion to AC frequency around Tg, and direct current conductivity was shown above Tg, which conductivity and its temperature dependence increased with using the additive such as polyoxyethylene oleyl ether, 1, 8-diazabicyclo [5, 4, 0]-7-undecene (phenol resin mixture) and benzyltriethyl ammonium chloride. Furthermore, it was found that the thermal expansion coefficient of free volume fraction that assumed from time-temperature superposition principle of complex modulus gave as good correlation for the temperature coefficient of electrical conductivity defined by the theoretical equation of the jumping model.
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