Self-healing UV-curable polymer network with reversible Diels-Alder bonds for applications in ambient conditions

Dorothee Ehrhardt, Kurt Van Durme, Johan Jansen, Bruno Van Mele, Niko Van den Brande

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

The ambient-temperature self-healing potential of a poly(methacrylate) network, containing reversible furan-maleimide Diels-Alder crosslinks, is studied. A reversible bis(methacrylate) monomer, containing Diels-Alder bonds, is synthesized and characterized by means of 1H NMR spectroscopy. Subsequent polymerization via UV-cure yields a reversible polymer network, consisting of thermoplastic poly(methacrylate), crosslinked by Diels-Alder bonds. Characterization of the polymer network via high-resolution solid-state 13C NMR indicates that undesirable side reactions, such as the formation of irreversible maleimide homo- and copolymers, are prevented by protecting the maleimide functionality in the Diels-Alder adduct. The thermal reversibility of the polymer network is studied by means of Fourier transform infrared spectroscopy and differential scanning calorimetry, and it is confirmed that the reversibility of the Diels-Alder reaction remains during several thermal cycles between −40 °C and 85 °C. Dynamic mechanical analysis confirms that the reversible polymer network maintains sufficient mechanical properties even at elevated temperatures up to 110 °C, at which retro Diels-Alder reaction is favored. Self-healing of the polymer network at ambient temperature, even in the fully vitrified state at 20 °C, is demonstrated by grinding the polymer material into a powder and then healing the powder (after compression) to form a rectangular bar with recovered mechanical properties. Ambient temperature healing without human intervention is therefore feasible, making this material suitable as e.g. encapsulant in photovoltaic modules for outside applications.

Original languageEnglish
Article number122762
Pages (from-to)1-9
Number of pages9
JournalPolymer
Volume203
DOIs
Publication statusPublished - 26 Aug 2020

Keywords

  • Reversible thermoset
  • Self-healing in vitrified state
  • Encapsulants for photovoltaics

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