Unification technique extensions

Chapter 5 also provides extensions of the unification technique to include master curves for normal stress difference, complex viscosity, storage modulus, and extensional viscosity. The advantages of such master curves are the same as those discussed earlier. For example, when the master curves of normal stress difference for three polyethylenes are put on the same plot (Fig. 10.2), they give a quick idea of the elastic response of the three systems and conclusions can be drawn as done before from Fig. 10.1. 

The method of obtaining process parameters from master rheograms has been given only for a limited number of cases in Chapter 8. The idea was only to demonstrate the procedure and hence it was limited to only a few processing techniques and that too only to selected processing parameters within the treated processing technique. Extensions of these ideas to other processing parameters would be more than welcome as it would increase the utility value of the presented unification approach. 

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