Viscoelastic Behavior of Disperse Systems with Silicone Oil and Different Fillers

Viscoelastic Behavior of Disperse Systems with Silicone Oil and Different Fillers

Blog Article

The rheological behavior of model suspensions with the silicone oil M20000 and different concentrations of Cab-o-sil TS 720 resp.Durcal 5 are compared.The increase of the Cab-o-sil concentration changes the flow behavior of the suspension from shear-thinning, to pseudoplastic, and to plastic flow behavior.The first normal stress difference ventilationstejp rises at the same time at certain shear rate.The disperse systems with Durcal 5 keep the structural viscous behavior of the silicone oil even with a filler concentration of 40.

5 wt%.The dependence of the first normal stress difference on shear rate represents for suspensions with Durcal 5 only one straight line with a slope of n = 2.The normal stress has double the amount of the silicone oil M20000 at given shear rate and is soiebiologique.com independent of the used Durcal 5 concentration.It was established that suspensions with the silicone oil M20000 have a first normal stress difference that can, depending on the filler type, either increase (with Cab-o-sil TS 720) or decrease (with Durcal 5) at certain shear stress with increasing filler concentration.It is to be supposed that the decrease of the normal stress at a given shear stress, with increasing Durcal concentration, is a softening effect, caused by the filler.