Various Possibilities in Using the Sentmanat Extensional Rheometer - Fixture with an MCR

Extensional rheology plays an important role in various industrial processes with converging and squeezing flow: Examples are extrusion, blow molding, calendering, coating, fiber spinning, etc. The dynamic response of polymer melts or solutions in uniaxial extensional flow is totally different from those in shear flow. As a result of the polymer chains stretching and aligning very rapidly along the streamlines, the molecules show non-linear behavior, which provides information that cannot be obtained by shear rheology. Hence, the polymer structure and morphology plays an important role in uniaxial extensional flow characterization. The measurements were conducted with an Anton Paar modular compact rheometer and a convection temperature device and the measurements were carried out on the LDPE samples using an SER fixture and a plate–plate geometry.

Introduction

Extensional rheology plays an important role in various industrial processes with converging and squeezing flow: Examples are extrusion, blow molding, calendering, coating, fiber spinning, etc. The dynamic response of polymer melts or solutions in uniaxial extensional flow is totally different from those in shear flow. As a result of the polymer chains stretching and aligning very rapidly along the streamlines, the molecules show non-linear behavior, which provides information that cannot be obtained by shear rheology. Hence, the polymer structure and morphology plays an important role in uniaxial extensional flow characterization.

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