Self-sealing of mechanical damage in a fully cured structural composite

Jericho L. Moll, Henghua Jin, Chris L. Mangun, Scott R. White, Nancy R. Sottos

Research output: Contribution to journalArticle

Abstract

A two part healing chemistry, stable to 150. °C, is incorporated in a woven glass/epoxy fiber-reinforced composite with a glass transition temperature (Tg) of 127. °C. The healing system is comprised of one type of microcapsules containing silanol end-functionalized polydimethylsiloxane, and a crosslinking agent, polydiethoxysilane, and a second type containing dibutyltin dilaurate catalyst in the solvent hexylacetate. The effects of microcapsule size and concentration on self-healing and mechanical properties including short beam strength, storage modulus and Tg were investigated. Self-healing of mechanical damage is assessed through the use of a pressure cell apparatus to detect nitrogen flow through a damaged composite. Complete self-healing was achieved when 42. μm diameter microcapsules at a loading of 9 vol.% or 25. μm microcapsules at a loading of 11 vol.% were added to the matrix.

Original languageEnglish (US)
Pages (from-to)15-20
Number of pages6
JournalComposites Science and Technology
Volume79
DOIs
StatePublished - Apr 18 2013

Keywords

  • Autonomic
  • Microcapsules
  • Microcrack
  • Self-healing
  • Woven composite

ASJC Scopus subject areas

  • Engineering(all)
  • Ceramics and Composites

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