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Buckling Instabilities in Polymer Brush Surfaces via Postpolymerization Modification.

Wei Guo1, Cassandra M Reese1, Li Xiong1

  • 1School of Polymer Science and Engineering, University of Southern Mississippi, Hattiesburg, MS 39406.

Macromolecules
|March 6, 2018
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Summary
This summary is machine-generated.

We developed a simple method to create wrinkled polymer brush surfaces. The size of wrinkles on these ultrathin polymer surfaces can be controlled by adjusting post-polymerization modification reaction time.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Surface Engineering

Background:

  • Ultrathin polymer brush surfaces are crucial in various applications.
  • Controlling surface morphology is key to tailoring material properties.
  • Existing methods for surface modification can be complex.

Purpose of the Study:

  • To develop a simple post-polymerization modification (PPM) route for engineering wrinkled polymer brush surfaces.
  • To investigate the tunability of wrinkle morphology based on PPM parameters.
  • To understand the mechanism behind wrinkle formation.

Main Methods:

  • Utilizing post-polymerization modification (PPM) under poor solvent conditions.
  • Employing ellipsometry to characterize PPM kinetics and swelling behavior.
  • Using time-of-flight secondary ion mass spectroscopy (ToF-SIMS) for through-thickness composition analysis.

Main Results:

  • Achieved tunable wrinkled morphologies on ultrathin polymer brush surfaces.
  • Demonstrated control over wrinkle feature size (hundreds of nanometers to one micrometer) via PPM reaction time.
  • Identified partial crosslinking of the outer polymer brush layer as critical for wrinkling upon swelling.

Conclusions:

  • PPM offers a straightforward approach to create tunable wrinkled polymer brush surfaces.
  • Understanding PPM kinetics and swelling is essential for controlling buckling behavior.
  • This method provides a pathway for designing advanced polymer surfaces with specific topographical features.