The relevance of entry flow measurements for the estimation of extensional viscosity of polymer meltsThe relevance of entry flow measurements for the estimation of extensional viscosity of polymer melts Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-11-141998enThe extensional viscosity of some flexible chain polymers and a thermotropic liquid crystalline polymer was measured in uniaxial extensional flow at constant extension rate. Power law functions were found for the dependence of the extensional viscosity at constant accumulated strain on strain rate. The stress growth curves were compared with measurements in axisymmetric entry flow, where both elongation and shear occur. The comparison showed that the values of the extensional viscosity calculated from the measurements in the entry flow correspond to the ones calculated from the viscosity growth measured in uniaxial elongation and averaged over extensional strain equal to what is accumulated on the fluid as it flows from the barrel into the capillary.http://creativecommons.org/licenses/by/4.0/Rheologica Acta375430-437 Gotsis Alexandros Γκοτσης Αλεξανδρος Odriozola Arantza Springer Verlag Entry flow method Extensional viscosity Extensional strain Polymer melts