Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 5: Polymer Networks and Elastomers I

CPP 5.2: Vortrag

Montag, 12. März 2018, 10:00–10:15, PC 203

Rheology of cross-linked polymer networks — •Jakob Löber — Max Planck Institute for the Physics of Complex Systems, Dresden, Germany

Polymer networks and gels may exhibit complex rheological behavior as e.g. an increase of the shear modulus in time known as rheological aging, shear rejuvenation, and a yield stress. I present a model for cross-linked polymer networks which treats the number of cross-links as a thermodynamic variable. This number may change due to a chemical reaction modeled as a rate equation, with a chemical equilibrium constant depending on mechanical deformations. Thus applying e.g. a large shear deformation affects the number of cross-links, leading to nonlinear threshold behavior reminiscent of shear rejuvenation and yield stress.