Abstract
This work explores the picture associated with stress overshoot during sudden continual (i.e., startup) external deformation of entangled polymeric liquids and proposes a specific scaling form to depict the intermolecular interactions responsible for chain deformation. Following a previously proposed idea that the stress overshoot in startup deformation is a signature of yielding, we search for ingredients that should go into the description of the force imbalance at the yield point and show that the expression for the intermolecular locking force fiml, derived from the characteristics associated with the yield point, can be tested against experiment. New rate-switching experiments support the proposed formula for fiml.
| Original language | English |
|---|---|
| Pages (from-to) | 1389-1401 |
| Number of pages | 13 |
| Journal | Journal of Rheology |
| Volume | 53 |
| Issue number | 6 |
| DOIs | |
| State | Published - 2009 |
| Externally published | Yes |
Funding
This research is supported, in part, by a grant (Grant No. DMR-0821697) from the National Science Foundation. We would like to thank the reviewers for their constructive comments that greatly improved our presentation.
| Funders | Funder number |
|---|---|
| National Science Foundation |
Keywords
- Entangled Polymeric Liquids
- Force Imbalance
- Inhomogeneous Shear
- Intermolecular Locking Force
- Stress Overshoot
- Yielding