PARAMETERS AFFECTING THE INTRINSIC VISCOSITY

The concentration is not a true parameter affecting the intrinsic viscosity since the intrinsic viscosity is defined in ideal dilution (c->0) according to Eq. (4.7). Nevertheless, the influence of the concentration on the reduced viscosity q ed is of great importance for the determination of the intrinsic viscosity. 

Attempts were made to relate intrinsic viscosity [T)] to solubility parameters of mixed solvents. 82 of polymer was calculated from the equation [T)] = f(8i). The authors assumed that the maximum value of [11] is when 5j = 8j of polymer. However, studying [t)] for polymethylmethacrylate in fourteen liquids, the authors found a large scatter of experimental points through which they have drawn a curve with a diffusion maximum. Thus the precision of 8j values was affected by 10% scatter in experimental data. 

Catalytic combustion of CO is a fast reaction. At normal operation the catalyst is in the outer mass transport controlled region, this means that the reaction rate of the catalyst is higher than the rate of transport of reactants from the gas bulk to the outer surface of the catalyst. The apparent activity is then affected by parameters like geometry of catalyst, flow rate and properties of the gas, like viscosity and density. A change in temperature effects the properties of the gas and the flow rate, it therefore effects the conversion slightly, however it is not the change in intrinsic reaction rate that can be seen. 

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