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Mechanisms of Polymer Adsorption onto Solid Substrates
David Nieto Simavilla1, Weide Huang1,2, Philippe Vandestrick1
1Laboratory of Polymer and Soft Matter Dynamics, Faculté des Sciences, Université libre de Bruxelles (ULB), Boulevard du Triomphe, Bâtiment NO, Bruxelles 1050, Belgium.
ACS Macro Letters
|June 2, 2022
Summary
This study introduces a new method to distinguish between molecular rearrangement and potential-driven adsorption mechanisms. Findings reveal adsorption is thermally activated, with final amounts determined by interface interactions, not temperature.
Area of Science:
- Polymer science
- Surface chemistry
- Materials science
Background:
- Controlling polymer/substrate interfaces is crucial for material properties.
- Adsorbed layers formation is key to interface control without chemical modification.
- Two primary mechanisms govern irreversible polymer chain attachment: molecular rearrangement and potential-driven adsorption.
Purpose of the Study:
- To introduce an analytical method for differentiating molecular rearrangement and potential-driven adsorption.
- To investigate the influence of thermal energy and interaction potential on adsorption kinetics.
- To understand the factors affecting equilibrium and non-equilibrium adsorption processes.
Main Methods:
- Analysis of experimental data and simulations.
- Investigation of thermal energy and interaction potential effects.
- Characterization of adsorption kinetics under varying conditions.
Main Results:
- A novel analytical method successfully differentiates adsorption mechanisms.
- Adsorption process is thermally activated with activation energy similar to local noncooperative processes.
- Final adsorbed polymer amount is solely dependent on interface interaction, independent of temperature in experiments.
- A universal linear relation between short and long adsorption time growth rates was identified.
Conclusions:
- The monomer pinning mechanism is independent of surface coverage.
- Adsorption rate is progressively limited by the availability of free surface sites.
- The developed method provides insights into polymer adsorption kinetics and interface control.
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