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Related Experiment Videos

Dewetting of Thin Block Copolymer Films

Hamley1, Hiscutt, Yang

  • 1School of Chemistry, University of Leeds, Leeds, West Yorkshire, LS2 9JT, United Kingdom

Journal of Colloid and Interface Science
|January 8, 1999
PubMed
Summary

This study investigated polymer thin film dewetting on silicon. Autophobic dewetting resulted in polymer droplets and a residual thin film, with hole growth velocity depending exponentially on temperature.

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Adsorption of Diblock Copolymers of Poly(ethylene oxide) and Poly(lactide) at Hydrophilic Silica from Aqueous Solution.

Journal of colloid and interface science·2000

Area of Science:

  • Polymer Science
  • Materials Science
  • Surface Science

Background:

  • Thin films of poly(oxyethylene)/poly(oxybutylene) diblock and triblock copolymers are relevant in various material applications.
  • Understanding dewetting phenomena is crucial for controlling film morphology and properties.

Purpose of the Study:

  • To investigate the dewetting behavior of low molecular weight poly(oxyethylene)/poly(oxybutylene) copolymer thin films on silicon substrates.
  • To characterize the morphology and structure of dewetted films and understand the underlying mechanisms.

Main Methods:

  • Video microscopy was employed to observe the dewetting process and film morphology.
  • X-ray reflectivity was utilized to determine the thickness of the residual polymer film on the substrate.
  • Optical microscopy was used to study the kinetics of hole growth during dewetting.

Main Results:

  • Dewetting resulted in the formation of polygonal domains of polymer droplets, with domain sizes in the millimeter range.
  • X-ray reflectivity revealed a residual polymer film less than 50 Å thick coexisting with macroscopic droplets, indicating autophobic dewetting.
  • The growth velocity of holes in the polymer film was constant at a fixed temperature and showed an exponential dependence on temperature.

Conclusions:

  • The study demonstrates autophobic dewetting in poly(oxyethylene)/poly(oxybutylene) copolymer thin films on silicon.
  • A microscopically thin film is in equilibrium with macroscopic polymer droplets after dewetting.
  • The temperature dependence of hole growth velocity follows an exponential relationship, providing insights into the dewetting kinetics.

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