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Updated: Jun 23, 2026
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Fabrication of Large-area Free-standing Ultrathin Polymer Films
Published on: June 3, 2015
Dewetting dynamics of stressed viscoelastic thin polymer films
1Laboratoire de Physico-Chimie Théorique-UMR CNRS Gulliver 7083, ESPCI, 10 rue Vauquelin, F-75231 Paris, France.
Summary
Residual stresses in ultrathin polymer films significantly impact dewetting dynamics. Our viscoelastic model reveals how stress relaxation and changing dissipation mechanisms influence film behavior and rim width, explaining experimental observations.
Area of Science:
- Materials Science
- Polymer Physics
- Surface Science
Background:
- Ultrathin polymer films, often produced via spin coating, develop internal stresses due to non-equilibrium configurations.
- These residual stresses are believed to influence film behavior, but their precise effects on dewetting dynamics are not fully understood.
Purpose of the Study:
- To investigate the influence of lateral residual stresses on the dewetting dynamics of ultrathin polymer films.
- To analyze the temporal evolution of film height and velocity profiles, and the interplay of dissipation mechanisms.
Main Methods:
- Utilized a viscoelastic thin-film model to simulate dewetting.
- Analyzed the evolution of height and velocity profiles within the film.
- Investigated the contributions of viscous and frictional dissipation.
Main Results:
- The shape of dewetting profiles and the dominance of dissipation mechanisms (viscous vs. frictional) evolve over time.
- Nonlinear substrate friction significantly affects dissipation and film behavior.
- The interplay between stress relaxation, non-stationary profiles, and changing dissipation explains complex dewetting phenomena.
Conclusions:
- Lateral residual stresses play a crucial role in the dewetting dynamics of ultrathin polymer films.
- The study provides a theoretical framework to understand experimental observations, including unexpected maxima in rim width.
- This research offers insights into the behavior of stressed polymer films relevant to material processing and nanotechnology.
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