Microcapsules filled with reactive solutions for self-healing materials

B. J. Blaiszik; M. M. Caruso; D. A. McIlroy; J. S. Moore; S. R. White; N. R. Sottos

doi:10.1016/j.polymer.2008.12.040

Microcapsules filled with reactive solutions for self-healing materials

B. J. Blaiszik, M. M. Caruso, D. A. McIlroy, J. S. Moore, S. R. White, N. R. Sottos

Research output: Contribution to journal › Article › peer-review

Abstract

Microcapsules containing a solvent and reactive epoxy resin are a critical component for the development of cost-effective, low toxicity, and low flammability self-healing materials. We report a robust in situ encapsulation method for protection of a variety of oil soluble solvents and reactive epoxy resins surrounded by a thin, polymeric, urea-formaldehyde (UF) shell. Resin-solvent capsules are produced in high yield with diameters ranging from 10 to 300 μm by controlling agitation rates. These capsules have a continuous inner shell wall and a rough exterior wall that promotes bonding to a polymer matrix. Capsules as small as 300 nm in diameter are achieved through sonication and stabilization procedures. The presence of both the epoxy resin and solvent core components is confirmed by differential scanning calorimetry (DSC) measurements, and the relative amount of epoxy and solvent in the liquid core is determined by thermogravimetric analysis (TGA). The capsules are shown to satisfy the requirements for use in self-healing materials including processing survivability, thermal stability, and efficient in situ rupture for delivery of healing agent.

Original language	English (US)
Pages (from-to)	990-997
Number of pages	8
Journal	Polymer
Volume	50
Issue number	4
DOIs	https://doi.org/10.1016/j.polymer.2008.12.040
State	Published - Feb 9 2009

Keywords

Autonomic materials
Microcapsules
Self-healing

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics

Online availability

10.1016/j.polymer.2008.12.040

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title = "Microcapsules filled with reactive solutions for self-healing materials",

abstract = "Microcapsules containing a solvent and reactive epoxy resin are a critical component for the development of cost-effective, low toxicity, and low flammability self-healing materials. We report a robust in situ encapsulation method for protection of a variety of oil soluble solvents and reactive epoxy resins surrounded by a thin, polymeric, urea-formaldehyde (UF) shell. Resin-solvent capsules are produced in high yield with diameters ranging from 10 to 300 μm by controlling agitation rates. These capsules have a continuous inner shell wall and a rough exterior wall that promotes bonding to a polymer matrix. Capsules as small as 300 nm in diameter are achieved through sonication and stabilization procedures. The presence of both the epoxy resin and solvent core components is confirmed by differential scanning calorimetry (DSC) measurements, and the relative amount of epoxy and solvent in the liquid core is determined by thermogravimetric analysis (TGA). The capsules are shown to satisfy the requirements for use in self-healing materials including processing survivability, thermal stability, and efficient in situ rupture for delivery of healing agent.",

keywords = "Autonomic materials, Microcapsules, Self-healing",

author = "Blaiszik, {B. J.} and Caruso, {M. M.} and McIlroy, {D. A.} and Moore, {J. S.} and White, {S. R.} and Sottos, {N. R.}",

note = "Funding Information: This work was supported by the Air Force Office of Scientific Research (MURI grant no. FA9550-05-1-0346, grant no. FA9550-06-1-0553) and the Department of Defense (National Defense Science and Engineering Graduate Fellowship). The authors gratefully acknowledge Stuart R. Schelkopf and Alexandra M. Landry for their microencapsulation contributions to this paper, Scott Robinson for assistance with the electron microscopy, and the Imaging Technology Group (Beckman Institute). Copyright: Copyright 2018 Elsevier B.V., All rights reserved.",

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AU - Blaiszik, B. J.

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AU - Moore, J. S.

AU - White, S. R.

AU - Sottos, N. R.

N1 - Funding Information: This work was supported by the Air Force Office of Scientific Research (MURI grant no. FA9550-05-1-0346, grant no. FA9550-06-1-0553) and the Department of Defense (National Defense Science and Engineering Graduate Fellowship). The authors gratefully acknowledge Stuart R. Schelkopf and Alexandra M. Landry for their microencapsulation contributions to this paper, Scott Robinson for assistance with the electron microscopy, and the Imaging Technology Group (Beckman Institute). Copyright: Copyright 2018 Elsevier B.V., All rights reserved.

PY - 2009/2/9

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N2 - Microcapsules containing a solvent and reactive epoxy resin are a critical component for the development of cost-effective, low toxicity, and low flammability self-healing materials. We report a robust in situ encapsulation method for protection of a variety of oil soluble solvents and reactive epoxy resins surrounded by a thin, polymeric, urea-formaldehyde (UF) shell. Resin-solvent capsules are produced in high yield with diameters ranging from 10 to 300 μm by controlling agitation rates. These capsules have a continuous inner shell wall and a rough exterior wall that promotes bonding to a polymer matrix. Capsules as small as 300 nm in diameter are achieved through sonication and stabilization procedures. The presence of both the epoxy resin and solvent core components is confirmed by differential scanning calorimetry (DSC) measurements, and the relative amount of epoxy and solvent in the liquid core is determined by thermogravimetric analysis (TGA). The capsules are shown to satisfy the requirements for use in self-healing materials including processing survivability, thermal stability, and efficient in situ rupture for delivery of healing agent.

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Microcapsules filled with reactive solutions for self-healing materials

Abstract

Keywords

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