Shift factor temperature dependence according

The parameter is made temperature dependent according to the rheological relaxation time shift factor Uj-... 

The mechanical properties of Shell Kraton 102 were determined in tensile creep and stress relaxation. Below 15°C the temperature dependence is described by a WLF equation. Here the polystyrene domains act as inert filler. Above 15°C the temperature dependence reflects added contributions from the polystyrene domains. The shift factors, after the WLF contribution, obeyed Arrhenius equations (AHa = 35 and 39 kcal/mole). From plots of the creep data shifted according to the WLF equation, the added compliance could be obtained and its temperature dependence determined independently. It obeyed an Arrhenius equation ( AHa = 37 kcal/mole). Plots of the compliances derived from the relaxation measurements after conversion to creep data gave the same activation energy. Thus, the compliances are additive in determining the mechanical behavior. 

The melt viscosity of SPS can be superposed on to a single curve according to the time-temperature law (Figure 18.11). The viscosity of SPS has a 3.4 power dependence on Mw (Figure 18.12). When the shift factor, aj, is plotted against... 

The -Al203 sample shows shifting of the maximum reduction temperature with increasing metal content. Comparing the first reduction peak of the supported samples with the reduction of bulk NiO, it turns out that with increasing metal content, the reduction is facilitated. Results show the same behavior for the second peak. According to Li and Chen, the reduction rate of NiO depends, besides other factors from the nucleation of metallic Ni. Indeed, higher metal concentrations favored the reduction of Ni species and so the reduction rate. 

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