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Related Experiment Videos

Temperature-actuated changes in wettability at elastomer/water interfaces.

Sureurg Khongtong1, Gregory S Ferguson

  • 1Department of Chemistry and Materials Science & Engineering, Lehigh University, Bethlehem, Pennsylvania 18015-3172, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|November 3, 2004
PubMed
Summary

Modified polymer surfaces show reversible changes in water interaction with temperature. Repeated temperature cycles reduce this reversibility due to polymer chain alignment and force decay, mimicking bulk material properties.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Surface Chemistry

Background:

  • Elastomers like polybutadiene and polyisoprene are widely used materials.
  • Understanding their surface properties is crucial for advanced applications.
  • Temperature-dependent surface behavior offers unique functionalities.

Purpose of the Study:

  • To modify elastomer surfaces to exhibit temperature-responsive behavior.
  • To investigate the reversibility of surface reconstruction in response to water temperature.
  • To elucidate the mechanisms behind the damping of this reversibility.

Main Methods:

  • Surface modification of 1,4-polybutadiene and cis-1,4-polyisoprene to introduce polar groups.
  • Testing surface hydrophilicity/hydrophobicity by cycling between hot and cold water.

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  • Parallel experiments on interfacial and bulk elastomer behavior.

    • Main Results:

    • Modified surfaces showed reversible hydrophilicity/hydrophobicity changes with water temperature.
    • Surfaces became hydrophobic in hot water and hydrophilic in cold water.
    • Repeated temperature cycling led to a decrease in reversibility.

    Conclusions:

    • The damping of reversibility is attributed to interfacial chain alignment and reduced restoring force.
    • Elastomer interfacial behavior can mirror bulk viscoelastic properties.
    • This study demonstrates a novel approach to creating smart, temperature-responsive polymer surfaces.