Abstract
The change in attenuation of longitudinal ultrasonic waves has been measured as a function of frequency and temperature for natural rubber samples loaded with semi-reinforcing oil furnace black (SRF) in increasing quantities and vulcanized with either mercaptobenzo-thiazol (MBT) or N-oxidethylene benzothiazol sulphenamide (OBTS) after being subjected to natural ageing for 8 years. One relaxation process was noticed in the range of frequency where the activation energy was calculated. Also, the dielectric constant ε′ and dielectric loss ε′' have been investigated for those samples in the frequency range from 10 2 to 10 5 Hz at room temperature (∼25°C). The results are compared with those previously obtained. The effect of 50 MR γ-irradiation on the dielectric properties of those samples was also studied and the results are interpreted.
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