POLYMAT - non isothermal fitting with WLF law : problem when trying to create curve at a new temperature value

The automatic fitting procedure in POLYMAT may produce a strange behaviour when the WLF equation is asked for the temperature dependence of the viscosity. For example, it may produce results that do not show any sensitivity with respect to temperature. How can this be overcome?

The WLF equation describing the temperature dependence of viscosity involves four parameters. In order to properly identify them, enough information should be provided or some parameters should be fixed. Actually, for sake of convenience, the formulation involves a redundancy. The easiest way to overcome the redundancy would consist of fixing the parameter referred to as "Tr-Ta".

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