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High-temperature wetting of polymer melts is explored using a glycerol drop on poly(n-butyl methacrylate). Wetting ridge growth is linked to molecular dynamics, explained by rheology and a modified elastomer model.

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Area of Science:

  • Polymer Science and Engineering
  • Materials Science
  • Physical Chemistry

Background:

  • Understanding polymer melt wetting is crucial for high-temperature material processing and applications.
  • Previous models for wetting dynamics often did not fully account for the time-dependent behavior of uncrosslinked polymer melts.

Purpose of the Study:

  • To investigate the wetting behavior of polymer melts at elevated temperatures.
  • To correlate wetting ridge dynamics with underlying polymer chain dynamics.
  • To develop a predictive model for wetting ridge profiles in polymer melts.

Main Methods:

  • Experimental setup involving a glycerol drop placed on a poly(n-butyl methacrylate) film at high temperatures.
  • Measurement of the wetting ridge height and profile over time.
  • Characterization of polymer melt dynamics using oscillatory shear rheology.

Main Results:

  • The wetting ridge height exhibits continuous growth over the observation period.
  • Wetting ridge growth rates are directly related to polymer chain dynamics at the molecular level.
  • A modified elastomer wetting equation, incorporating time-dependent storage modulus, accurately models the wetting ridge profile.

Conclusions:

  • Polymer chain dynamics significantly influence high-temperature wetting phenomena.
  • Oscillatory shear rheology provides key insights into the molecular mechanisms governing wetting.
  • The developed model offers a valuable tool for predicting and understanding polymer melt wetting behavior.