Abstract
Hereunder is presented a brief report of the test made of the samples of styrene-butadiene rubber with respect to their dynamic mechanical properties with various concentration of oil ranging from 0 to 40 PHR, at various temperatures between -80°C and 40°C at varying frequencies from 1 to 100Hz, and their dynamic shear modulus G', G" were obtained. For the data, the superposition of time-temperature, time-concentration and time-temperature-concentration was examined. The results will be summerized as follows:
(1) The G' and G" data determined at different temperatures of each sample can be represented by a master curve by applying the method of time-temperature superposition, but the data obtained between -30°C and -50°C were scattered considerably. The shift distances logaT obtained by superposing the data at temperatures below about -5°C followed the WLF equation type, where the so-called universal values of constants in WLF equation were varied to obtain better fit. The logaT obtained at temperatures above -5°C followed the Arrhenius equation type.
(2) The G' and G" data determind at the constant temperature for samples with different concentrations can also be represented by a master curve by applying the method of time-concentration superposition. The shift distances log aC obtained by superposing the data followed the equation presented by Fujita.
(3) The superposition of time-temperature-concentration was found impossible.
