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Altering surface fluctuations by blending tethered and untethered chains.

J K Lee1, B Akgun, Z Jiang

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Partially tethering polymer chains to a surface dramatically slows surface height fluctuations. This effect is stronger than chain entanglement or increased glass transition temperature, offering control over surface properties.

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Area of Science:

  • Polymer Physics
  • Materials Science
  • Surface Science

Background:

  • Surface height fluctuations in thin polymer films influence properties like wetting and adhesion.
  • Understanding factors controlling these dynamics is crucial for materials design.

Purpose of the Study:

  • To investigate the impact of partial covalent tethering of polymer chains on surface dynamics.
  • To compare the effect of partial tethering with other factors like molecular weight and entanglement.

Main Methods:

  • Covalently attaching a fraction of polymer chains to a substrate in an unentangled melt.
  • Measuring surface height fluctuations in partially tethered films.
  • Comparing results with untethered polymer films of varying molecular weights.

Main Results:

  • Partial tethering significantly increases the relaxation time of surface height fluctuations, even for thick films.
  • The tethering effect is more dominant than substrate attraction, chain entanglement, or increased glass transition temperature (Tg).
  • Low molecular weight tethered polymers exhibited slower dynamics than high molecular weight untethered polymers.

Conclusions:

  • Partial tethering is a powerful method to control and reduce surface dynamics in polymer films.
  • This technique offers a route to tailor surface properties for applications in wetting, adhesion, and tribology.