Flow-Induced Friction Reduction in Shear Flows of Unentangled Polymer Melts
Christos Psevdos, Giovanni Ianniruberto · 2026
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Description
Christos Psevdos and Giovanni Ianniruberto analyze how friction falls as polymer melts flow in a 2026 theoretical study. Recent experiments on three unentangled polystyrene melts of different chain lengths showed complex thinning and stress patterns under fast shear. Single-chain simulations that let friction drop as chain segments align were compared with the measurements and with many-chain simulations.
The analysis confirmed that the friction coefficient must fall significantly as segment alignment rises. The extracted relationship matched earlier results from stretching experiments for the two longer-chain melts, while the shortest melt showed a weaker dependence. Single-chain models missed some effects that many-chain simulations captured, especially in stretching flows. The authors conclude that interactions between chains still hold part of the missing physics.
Catalog record
| CREATOR | Christos Psevdos, Giovanni Ianniruberto |
|---|---|
| YEAR | 2026 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 27 KB |
| LICENSE | https://creativecommons.org/licenses/by/4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |