Nonlinear rheology of unentangled polymers : bridging theory and experiments via computer simulations
(25AD)
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- Authors
- Supervisors
- van Ruymbeke, Evelyne
- Abstract
- The nonlinear rheology of polymers in their molten states is one of the most essential subjects of polymer science. However, a thorough understanding still presents significant challenges. The current thesis takes the task of amending the gaps between the molecular theory and experimental data regarding the nonlinear rheology of unentangled polymers by referring to computer simulations. Including simulation data offers valuable insights into the molecular structures of polymers under flow, which are often difficult to obtain through experiments. The essential questions investigated in this thesis are: 1) What are the additional ingredients to quantitatively reproduce the nonlinear rheology of unentangled polymers from the most fundamental model of linear viscoelasticity? 2) How can we predict the nonlinear extensional rheology of polymer melts or concentrated solutions from their material parameters? 3) How does the matrix affect the nonlinear response of a test chain in a binary blend? 4) How do intra-chain pairwise interactions affect the nonlinear shear rheology of polymers in the Θ-condition? 5) What kind of molecular picture can explain the nonlinear shear rheology of unentangled polymers? The current thesis solidly discusses these questions by combining experiments, theories, and simulations to improve our understanding of the nonlinear rheology of polymers.
- Affiliations
Citations
Jiang, N. (25 C.E.). Nonlinear rheology of unentangled polymers : bridging theory and experiments via computer simulations.