RheoPower Shortly by the Maxwell ModelWireframe models.
Used model by RheoPower software package is described shortly by the help of well-known Maxwellian model. Some shortcomings and simplifies have to do as strictly speaking they do not relate each other. The aim is help reader to understand RheoPower model and introduce Control Theory to rheology.
Building arrangement by Maxwell model
Building arrangement for RheoPower model
ViscoelasticityIn Maxwell model springs depicts elasticity and dashpots viscous forces. Respectively in RheoPower Model RED describes the elasticity effects of flow and RED'' viscous and Rouse relaxation ranges, which influence with polymers mainly out of measurement range, but have still viscous effect on complete flow elsewhere.
Mathematical treatmentIn Maxwell model is summed the effects of all elements together giving us an integral equation. Respectively in RheoPower model relaxation impulse is summed by general Control Theory procedure. Despite the fact that RheoPower describes accurately relaxation phenomenon it can use for many other viscoelastic flows similar way.
Secondary on the both sides is used the same variable for the scale bar and mathematical formulas.
Finally RED is converted to Molecular Weight Distribution (MWD) by similar procedure as used with GPC/SEC, but here is used formula and method called Melt Calibration, which is now also linear procedure.