Rheometer Meissner elongational

At the time of writing this article, there are only two instruments in the market in the U.S.A. - the Rheometrics Extensional Rheometer, the RFX, and the Rheometrics Elongation Melt Rheometer, based on Meissner s rotary clamp method. The RFX is based on the opposing jet method. 

J. Meissner and J. Hostettler, A New Elongational Rheometer for Polymer Melts and Other Highly Viscoelastic Liquids, Rheol. Acta, 33 1-21 (1994). 

Meissner J and Hosttler J (1994) A new elongational rheometer for polymer melts and other highly viscoelastic fluids. Rheol Acta 33 1-21. 

Since the invention of the rotary damp rheometer (Figure 1(a)) by Meissner [1], the elongational viscosity of linear and branched polyethylene (PE) melts has l n studied extensively. For polypropylene (PP), only a few studies have been published. The measurement of elongational viscosity at constant strain rate or constant tensile stress is of great importance for characterizing the structure of the pol5uner melt. 

Hachmann, P, Meissner, J. Rheometer for equibiaxial and planar elongations of polymer melts. . RheoL (2003) 47, pp. 989-1010... 

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