Polyurethane matrix incorporating PDMS-based self-healing microcapsules with enhanced mechanical and thermal stability

Ui Seok Chung, Ji Hong Min, Pyoung Chan Lee, Won-Gun Koh

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

For the purpose of developing self-healing skin layers of instrument panels in automobiles, mechanically and thermally stable microcapsules containing healing agents were prepared and incorporated into a polyurethane (PU) matrix. Two different poly(urea-formaldehyde) (PUF) microcapsules containing either a polydimethylsiloxane (PDMS)/Pt catalyst (Pt) blend or crosslinker were synthesized using in situ emulsion polymerization. However, the resulting microcapsules were mechanically and thermally weak. More than 40% of the microcapsules were broken during the washing/drying process, and capsule decomposition began at 200 °C. These properties of microcapsules were greatly enhanced by decreasing the capsule size and depositing an additional urea-formaldehyde (UF) layer onto pre-formed PUF microcapsules. The former was accomplished by tuning the stirring speed during the reaction and the latter by adding more urea components. Under optimized conditions, only approximately 10% of microcapsules were broken after the same washing/drying process, and the decomposition temperature was raised to 250 °C. The two different optimized microcapsules were successfully embedded in a PU matrix and could be broken upon matrix cracking, thereby releasing the healing agent to the target areas via capillary effects. Subsequently, it was confirmed that the cracked portions were repaired through chemical and/or physical interactions within the healing system.

Original languageEnglish
Pages (from-to)173-180
Number of pages8
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume518
DOIs
Publication statusPublished - 2017 Apr 5

Fingerprint

Polyurethanes
Mechanical stability
healing
Polydimethylsiloxane
Urea
Capsules
Thermodynamic stability
thermal stability
ureas
Formaldehyde
Washing
washing
Drying
capsules
matrices
formaldehyde
Instrument panels
drying
Decomposition
Emulsion polymerization

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

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title = "Polyurethane matrix incorporating PDMS-based self-healing microcapsules with enhanced mechanical and thermal stability",
abstract = "For the purpose of developing self-healing skin layers of instrument panels in automobiles, mechanically and thermally stable microcapsules containing healing agents were prepared and incorporated into a polyurethane (PU) matrix. Two different poly(urea-formaldehyde) (PUF) microcapsules containing either a polydimethylsiloxane (PDMS)/Pt catalyst (Pt) blend or crosslinker were synthesized using in situ emulsion polymerization. However, the resulting microcapsules were mechanically and thermally weak. More than 40{\%} of the microcapsules were broken during the washing/drying process, and capsule decomposition began at 200 °C. These properties of microcapsules were greatly enhanced by decreasing the capsule size and depositing an additional urea-formaldehyde (UF) layer onto pre-formed PUF microcapsules. The former was accomplished by tuning the stirring speed during the reaction and the latter by adding more urea components. Under optimized conditions, only approximately 10{\%} of microcapsules were broken after the same washing/drying process, and the decomposition temperature was raised to 250 °C. The two different optimized microcapsules were successfully embedded in a PU matrix and could be broken upon matrix cracking, thereby releasing the healing agent to the target areas via capillary effects. Subsequently, it was confirmed that the cracked portions were repaired through chemical and/or physical interactions within the healing system.",
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Polyurethane matrix incorporating PDMS-based self-healing microcapsules with enhanced mechanical and thermal stability. / Chung, Ui Seok; Min, Ji Hong; Lee, Pyoung Chan; Koh, Won-Gun.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 518, 05.04.2017, p. 173-180.

Research output: Contribution to journalArticle

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