Viscosity topological effect

The structure factor (P(M)) describes the topological relaxation of the macromolecular chains this is the function which will be described by molecular models, P(M) being the distribution of moleciilar weights. Here lies a very important point if one wishes to "isolate" the topological effects in order to test molecular models, one has to use rheological functions defined at the same segmental mobility, and hence the same value of the mobility factor as far as viscosity is concerned, the reduced function (T) will be used instead of the viscosity itself. 

Of course, the fitting of the data can give rise to some compensation effects and the accuracy of the determination of the wetted areas (related to the topological description of the liquid flow on the catalyst) is limited by the knowledge of all the physico-chemical properties (vapour pressure, viscosities etc.) and of the correlated parameters (mass transfer coefficient etc...) involved in the model. 

A combination of Eqs. 5.1 and 5.6 leads to v = 3y — 1 and = 3y>. Inputting our experimentally determined values of y and directly measured values (0.39 0.01 and 0.31 0.01) from the viscosity measurements, which cross-examines and validates our previous LLS data and current viscosity results. It is worth-noting that in comparison with LLS, viscosity is more sensitive and much easier to be measured in characterizing the effect of chain topology and conformation, such as the branching degree, because LLS measures the hydrodynamic size, while viscosity detects the hydrodynamic volume that is a cubic of the chain size. 

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