Paper Number
SM44 

Session
Polymers Solutions, Melts and Blends

Title
Nonequilibrium thermodynamics for soft matter made easy(er)

Presentation Date and Time
October 12, 2022 (Wednesday) 2:30

Track / Room
Track 2 / Sheraton 3

Authors (Click on name to view author profile)

1. Schieber, Jay D. (IIT, uCoSM)
2. Córdoba, Andrés (University of Chicago, Molecular Engineering)

Author and Affiliation Lines (in printed abstract book)
Jay D. Schieber¹ and Andrés Córdoba^2
1uCoSM, IIT, Chicago, IL 60616; ²Molecular Engineering, University of Chicago, Chicago, IL

Speaker / Presenter 
Schieber, Jay D.

Keywords
theoretical methods; polymer melts; polymer solutions

Text of Abstract
We propose straightforward energy and entropy balances to test thermodynamic consistency of microstructural rheological models. The method utilizes the same mathematical methods as classical transport phenomena, so is much simpler to use than the much more rigorous GENERIC formalism. The approach leads to two requirements for non-negative entropy production: one closely related to a virtual work argument, important during flow, and a second that guarantees adherence to the second law of thermodynamics during microstructural relaxation. These criteria do not appear to be in conflict with the requirements of more rigorous formulations, and is much simpler to implement. Several illustrative examples are given for several models, including the Hookean dumbbell, the FENE-P, and the Giesekus models, which are shown to satisfy the first and second laws, as well as the GLaMM model and FENE-mode model that do not.