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Elasticity patterns induced by phase-separation in polymer blend films.

Joanna Raczkowska1, Szymon Prauzner-Bechcicki2, Paweł Dąbczyński1

  • 1The Marian Smoluchowski Institute of Physics, Jagiellonian University, Łojasiewicza 11, 30-428 Kraków, Poland.

Thin Solid Films
|April 24, 2018
PubMed
Summary

The effective stiffness of polymer films on soft substrates increases with thickness, enabling patterned elasticity through phase separation. Polystyrene domains showed higher elasticity than poly(ethylene oxide) matrices.

Keywords:
Elasticity patternsPhase separationPoly(ethylene oxide)PolydimethylsiloxanePolymer blendPolystyreneThickness-dependent elasticityThin films

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Area of Science:

  • Materials Science
  • Polymer Science
  • Surface Science

Background:

  • Understanding polymer thin film mechanics is crucial for advanced material design.
  • The elasticity of polymer films can be influenced by substrate properties and film thickness.
  • Polydimethylsiloxane (PDMS) is a widely used soft polymer substrate.

Purpose of the Study:

  • To investigate the impact of polystyrene (PS) and poly(ethylene oxide) (PEO) thin film thickness on the effective elasticity of soft PDMS substrates.
  • To explore a novel method for creating patterned elasticity using phase separation in PS:PEO blend films.
  • To characterize the mechanical and adhesive properties of distinct domains within phase-separated films.

Main Methods:

  • Systematic studies on polymer thin films (PS, PEO) of varying thicknesses on soft PDMS substrates.
  • Atomic force microscopy (AFM) used to record force-displacement curves for elasticity determination.
  • Phase separation induced in symmetric and asymmetric PS:PEO blend films to create elasticity patterns.

Main Results:

  • Effective stiffness of polymer films on soft support increases monotonically with thickness, reaching a plateau above 200 nm.
  • No significant thickness dependence of elasticity was observed for films on hard supports.
  • Phase-separated PS:PEO blend films on soft support exhibited patterned elasticity, with PS domains being twice as elastic as the PEO matrix.
  • Adhesion forces were significantly higher (over 3 times) in PEO regions compared to PS regions.

Conclusions:

  • Film thickness is a critical parameter controlling the effective elasticity of polymer films on soft substrates.
  • Phase separation in polymer blends offers a non-conventional route to engineer spatially controlled elasticity patterns.
  • The distinct mechanical and adhesive properties of PS and PEO domains allow for tailored surface functionalities.