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Triggerable Super Absorbent Polymers for Coating Debonding Applications.

Ioannis A Kartsonakis1, Panagiotis Goulis1, Costas A Charitidis1

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Core-shell super absorbent polymers (SAPs) enable triggerable debonding of coatings from plastic substrates. This breakthrough facilitates easier plastic recycling by allowing coatings to detach upon steam treatment.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Engineering

Background:

  • Super absorbent polymers (SAPs) are known for their high water absorption capacity.
  • Current plastic recycling methods face challenges with separating coatings from substrates.
  • Developing triggerable materials for coatings is crucial for efficient recycling.

Purpose of the Study:

  • To investigate the efficacy of core-shell super absorbent polymers (SAPs) as triggerable components in coating binders.
  • To explore the application of SAPs in facilitating the debonding of coatings from plastic substrates for recycling purposes.

Main Methods:

  • Acrylic binder-based coatings containing 1 wt.% and 5 wt.% core-shell SAPs were applied to acrylonitrile-butadiene-styrene/polycarbonate substrates.
  • The coated plastic substrates were subjected to steam treatment to evaluate coating debonding.
  • The swelling behavior of SAPs and the resulting shell-breaking mechanism were analyzed.

Main Results:

  • The incorporation of SAPs into the coatings induced effective debonding upon steam treatment.
  • The core-shell structure of SAPs, with differential swelling of core and shell, was identified as the trigger mechanism.
  • Steam exposure caused SAPs to swell, break their inorganic shell, and reduce interfacial adhesion, leading to coating detachment.

Conclusions:

  • Core-shell SAPs demonstrate significant potential as triggerable materials in coating binders for enhanced plastic recycling.
  • The developed formulations offer a viable approach for industrial plastic recycling applications by enabling easy coating removal.