Electrically Self-Healing Thermoset MWCNTs Composites Based on Diels-Alder and Hydrogen Bonds

Guilherme Macedo R. Lima, Felipe Orozco*, Francesco Picchioni, Ignacio Moreno-Villoslada, Andrea Pucci, Ranjita K. Bose, Rodrigo Araya-Hermosilla

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

14 Citations (Scopus)
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Abstract

In this work, we prepared electrically conductive self-healing nanocomposites. The material consists of multi-walled carbon nanotubes (MWCNT) that are dispersed into thermally reversible crosslinked polyketones. The reversible nature is based on both covalent (Diels-Alder) and non-covalent (hydrogen bonding) interactions. The design allowed for us to tune the thermomechanical properties of the system by changing the fractions of filler, and diene-dienophile and hydroxyl groups. The nanocomposites show up to 1 x 10(4) S/m electrical conductivity, reaching temperatures between 120 and 150 degrees C under 20-50 V. The self-healing effect, induced by electricity was qualitatively demonstrated as microcracks were repaired. As pointed out by electron microscopy, samples that were already healed by electricity showed a better dispersion of MWCNT within the polymer. These features point toward prolonging the service life of polymer nanocomposites, improving the product performance, making it effectively stronger and more reliable.

Original languageEnglish
Article number1885
Number of pages15
JournalPolymers
Volume11
Issue number11
DOIs
Publication statusPublished - Nov-2019

Keywords

  • Paal-Knorr reaction
  • polyketone
  • carbon nanotubes
  • nanocomposite
  • Diels-Alder
  • click-chemistry
  • hydrogen bonding
  • self-healing
  • re-workability
  • recycling
  • Joule heating
  • MULTIWALLED CARBON NANOTUBES
  • CROSS-LINKING
  • POLYMER NETWORKS
  • NANOCOMPOSITES
  • FUNCTIONALIZATION
  • COVALENT

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