Rheologica Acta

, Volume 40, Issue 4, pp 317-321

First online:

Thermodynamic admissibility of the pompon model for branched polymers

  • Hans Christian ÖttingerAffiliated withETH Zürich, Department of Materials Institute of Polymers, and Swiss Rheocenter, 8092 Zürich, Switzerland e-mail: hco@ifp.mat.ethz.ch

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The pompon model for branched polymers is re-formulated within a general framework of nonequilibrium thermodynamics. While the original model of McLeish and Larson is found to be thermodynamically admissible, nonequilibrium thermodynamics strongly suggests several model modifications. As an immediate consequence, a nonzero second normal-stress coefficient in shear flow is predicted by the modified pompon model.

Key words Melts of branched polymers Pompon model Nonequilibrium thermodynamics GENERIC Second normal-stress coefficient