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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Adhesion Force Analysis of Dynamic Polymer Brushes.

Taihei Aoki1, Kohzo Ito1, Hideaki Yokoyama1

  • 1Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Chiba 277-8561, Japan.

Langmuir : the ACS Journal of Surfaces and Colloids
|May 19, 2020
PubMed
Summary

Dynamic polymer brushes form uniform hydrophilic layers at water interfaces. These brushes exhibit reduced hydrophobic interactions and unique pressure-responsive behavior, indicating chain reallocation under stress.

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Area of Science:

  • Polymer Science
  • Surface Chemistry
  • Materials Science

Background:

  • Amphiphilic diblock copolymers spontaneously segregate at water interfaces.
  • This segregation forms dynamic polymer brushes, observable only in aqueous environments.
  • Advanced techniques like neutron reflectivity are typically needed to study these embedded interfaces.

Purpose of the Study:

  • To investigate the hydrophobic interactions of dynamic polymer brushes in water.
  • To characterize the surface properties and behavior of these brushes under varying conditions.
  • To explore the potential of adhesion force measurements as a monitoring method.

Main Methods:

  • Fabrication of dynamic polymer brushes via spontaneous copolymer segregation.
  • Adhesion force measurements using atomic force microscopy (AFM) with a hydrophobic probe.
  • Adhesion force imaging to assess layer uniformity and defect presence.

Main Results:

  • Dynamic polymer brushes demonstrated reduced hydrophobic interactions, intensifying with higher graft density.
  • A distinct pressure-dependent adhesion force was observed: near-zero at low pressure, increasing with higher applied pressure.
  • Adhesion force imaging confirmed the formation of uniform, defect-free dynamic polymer brush layers across all densities.

Conclusions:

  • Adhesion force measurement is a viable method for monitoring dynamic polymer brushes and their surface properties.
  • The observed pressure-induced transitional response suggests chain reallocation or retraction, characteristic of non-permanently bound chains.
  • Dynamic polymer brushes form stable, uniform layers due to repulsive inter-chain interactions.