Diffusion and reaction phenomena in solution-based healing of polymer coatings using the diels-alder reaction

Purnomo A. Pratama, Amy M. Peterson, Giuseppe R. Palmese

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

The healing of a furan-functional epoxy coating using bismaleimide (BMI) solutions is demonstrated. Corrosion studies of scratched coated carbon steel show that solution healing of damaged coatings inhibits corrosion. The healing relies on (i) the diffusion of solution components into the polymer, causing the system to swell, thus bringing crack surfaces into contact, and (ii) Diels-Alder adduct formation between furan moieties of the polymer network and the maleimide, resulting in covalent bonding across the crack interface. For the system investigated, crack healing is reaction-limited for small crack widths. The results provide a guideline for the design and implementation of self-healing systems based on BMI solution encapsulation. The healing of a furan-functional epoxy thermoset coating using bismaleimide (BMI) solutions is demonstrated. Healing is influenced by Diels-Alder reaction kinetics and solution diffusion behavior. SEM images of scratched and healed coatings show that room-temperature exposure to a solution of BMI in dimethylformamide heals scratches whereas other treatments do not.

Original languageEnglish (US)
Pages (from-to)173-181
Number of pages9
JournalMacromolecular Chemistry and Physics
Volume213
Issue number2
DOIs
StatePublished - Jan 27 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Materials Chemistry
  • Polymers and Plastics
  • Physical and Theoretical Chemistry
  • Organic Chemistry

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