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Silicone elastomers and the Persson-Brener adhesion model.

Kurt R VanDonselaar1, Daniel A Bellido-Aguilar2, Maryam Safaripour2

  • 1Department of Physics, North Dakota State University, Fargo, North Dakota 58102, USA.

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Soft coatings like polydimethylsiloxane are used for anti-icing. This study shows elastomer viscoelasticity, not just low surface energy, significantly impacts adhesion failure, especially at different speeds.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Polymer Physics

Background:

  • Modern anti-icing and anti-fouling coatings often utilize soft, low surface energy elastomers, such as polydimethylsiloxane.
  • While low surface energy is beneficial for reducing adhesion, the significant role of elastomer viscoelasticity in adhesive failure is often overlooked.

Purpose of the Study:

  • To investigate the influence of viscoelastic properties on the adhesive failure of siloxane elastomers.
  • To correlate adhesion measurements with dynamic mechanical properties and evaluate the applicability of the Persson-Brener model.

Main Methods:

  • JKR adhesion tests were performed on various siloxane elastomers across a range of speeds and temperatures.
  • Dynamic mechanical analysis was used to characterize the storage and loss moduli over a broad frequency spectrum.
  • Adhesion data was compared with mechanical moduli using the Persson-Brener model.

Main Results:

  • Adhesion strength varied significantly among the siloxane elastomers despite similar surface energies.
  • Low-speed adhesion variations were linked to elastomer architecture, while speed dependence was independent of it.
  • Qualitative correlations were observed between JKR adhesion measurements and dynamic moduli.
  • The full Persson-Brener model accurately predicted adhesion at low speeds but showed inaccuracies at higher speeds.

Conclusions:

  • The viscoelastic nature of elastomers plays a critical role in adhesive failure, complementing the effect of low surface energy.
  • Elastomer architecture influences adhesion at low speeds, but the speed dependence of adhesion is a more general phenomenon.
  • The Persson-Brener model provides valuable insights into elastomer adhesion but requires refinement for high-speed applications.