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Updated: Sep 21, 2025

Fabrication of Large-area Free-standing Ultrathin Polymer Films
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Modifying Surface Fluctuations of Polymer Melt Films with Substrate Modification.

Yang Zhou1, Qiming He1, Fan Zhang1

  • 1Department of Polymer Science, The University of Akron, Akron, Ohio 44325, United States.

ACS Macro Letters
|June 2, 2022
PubMed
Summary
This summary is machine-generated.

Plasma polymerized films alter surface fluctuations in thin polystyrene films. Confinement effects in ultrathin films are influenced by substrate surface energy and adsorbed layer thickness.

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Area of Science:

  • Materials Science
  • Polymer Physics
  • Surface Science

Background:

  • Thin polymer films exhibit surface fluctuations that are sensitive to substrate interactions.
  • Hydrodynamic continuum theory (HCT) describes these fluctuations based on bulk viscosity.
  • Confinement effects become significant as film thickness decreases.

Purpose of the Study:

  • To investigate the impact of plasma polymerized films on polystyrene (PS) melt film surface fluctuations.
  • To understand how substrate modification affects confinement effects in ultrathin PS films.
  • To correlate surface fluctuation behavior with adsorbed layer thickness and substrate surface energy.

Main Methods:

  • X-ray photon correlation spectroscopy (XPCS) was used to measure surface fluctuation relaxation times.
  • Experiments were conducted on 131 kg/mol linear PS films of varying thicknesses (ca. 4R and ∼3R).
  • PS films were studied on both hydrogen-passivated silicon (H-Si) and plasma polymer modified silicon substrates.

Main Results:

  • HCT accurately describes fluctuations for thicker PS films (ca. 4R) on both substrates.
  • For ultrathin films (∼3R), surface fluctuations deviate from HCT predictions, indicating confinement effects.
  • The confinement effect is more pronounced on H-Si than on the plasma polymer modified surface.
  • The observed deviations are attributed to differences in the thickness of strongly adsorbed layers, influenced by substrate surface energy.

Conclusions:

  • Plasma polymerized films significantly alter surface dynamics in confined polymer films.
  • Substrate surface energy plays a crucial role in determining the adsorbed layer thickness and subsequent confinement effects.
  • XPCS and HCT provide a framework for understanding polymer film behavior at the nanoscale, highlighting the importance of interfacial phenomena.