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Shear rate threshold for the boundary slip in dense polymer films
1Department of Mechanical Engineering, Michigan State University, East Lansing, Michigan 48824, USA.
This study reveals how polymer slip length changes with shear rate in thin films. At low rates, slip is limited by interfacial layers; at high rates, it increases rapidly due to polymer chain relaxation.
Area of Science:
- Polymer physics
- Surface science
- Computational materials science
Background:
- Understanding polymer slip at interfaces is crucial for microfluidics and lubrication.
- Confined polymer dynamics differ significantly from bulk behavior.
Purpose of the Study:
- Investigate shear rate effects on slip length in confined polymer films.
- Characterize the transition from no-slip to slip flow conditions.
Main Methods:
- Molecular dynamics simulations using the bead-spring model for linear polymer chains.
- Analysis of velocity profiles, slip length, and polymer chain relaxation dynamics.
Main Results:
- At low shear rates, negative slip length correlates with interfacial layer thickness.
- At high shear rates, slip length increases rapidly with shear rate.
- Transition to slip flow is linked to faster polymer chain relaxation near the wall.
Conclusions:
- Polymer slip behavior is strongly dependent on shear rate and chain dynamics.
- Friction coefficient at high slip velocities depends on structural and thermodynamic factors.
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