Electrically-Responsive Reversible Polyketone/MWCNT Network through Diels-Alder Chemistry

Rodrigo Araya-Hermosilla, Andrea Pucci, Patrizio Raffa, Dian Santosa, Paolo P. Pescarmona, Regis Y. N. Gengler, Petra Rudolf, Ignacio Moreno-Villoslada, Francesco Picchioni

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Abstract

This study examines the preparation of electrically conductive polymer networks based on furan-functionalised polyketone (PK-Fu) doped with multi-walled carbon nanotubes (MWCNTs) and reversibly crosslinked with bis-maleimide (B-Ma) via Diels-Alder (DA) cycloaddition. Notably, the incorporation of 5 wt.% of MWCNTs results in an increased modulus of the material, and makes it thermally and electrically conductive. Analysis by X-ray photoelectron spectroscopy indicates that MWCNTs, due to their diene/dienophile character, covalently interact with the matrix via DA reaction, leading to effective interfacial adhesion between the components. Raman spectroscopy points to a more effective graphitic ordering of MWCNTs after reaction with PK-Fu and B-Ma. After crosslinking the obtained composite via the DA reaction, the softening point (tan(delta) in dynamic mechanical analysis measurements) increases up to 155 degrees C, as compared to the value of 130 degrees C for the PK-Fu crosslinked with B-Ma and that of 140 degrees C for the PK-Fu/B-Ma/MWCNT nanocomposite before resistive heating (responsible for crosslinking). After grinding the composite, compression moulding (150 degrees C/40 bar) activates the retro-DA process that disrupts the network, allowing it to be reshaped as a thermoplastic. A subsequent process of annealing via resistive heating demonstrates the possibility of reconnecting the decoupled DA linkages, thus providing the PK networks with the same thermal, mechanical, and electrical properties as the crosslinked pristine systems.

Original languageEnglish
Article number1076
Number of pages15
JournalPolymers
Volume10
Issue number10
DOIs
Publication statusPublished - Oct-2018

Keywords

  • functionalised polyketone
  • MWCNT
  • electrically conductive plastic nanocomposite
  • reversible Diels-Alder
  • recycling
  • resistive heating annealing
  • reworkability
  • HYDROGEN-BONDING INTERACTIONS
  • WALLED CARBON NANOTUBES
  • POLYMERIC MATERIALS
  • FUNCTIONALIZATION
  • STEP
  • NANOCOMPOSITES
  • NANOFILLERS
  • THERMOSETS
  • COVALENT
  • MATRIX

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