Journal of The Royal Society Interface
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A new self-healing epoxy with tungsten (VI) chloride catalyst

Jason M Kamphaus

Jason M Kamphaus

Department of Aerospace Engineering, University of IllinoisUrbana, IL 61801, USA

[email protected]

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,
Joseph D Rule

Joseph D Rule

Department of Chemistry, University of IllinoisUrbana, IL 61801, USA

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,
Jeffrey S Moore

Jeffrey S Moore

Department of Chemistry, University of IllinoisUrbana, IL 61801, USA

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,
Nancy R Sottos

Nancy R Sottos

Department of Materials Science and Engineering and The Beckman Institute for Advanced Science and Technology, University of IllinoisUrbana, IL 61801, USA

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and
Scott R White

Scott R White

Department of Aerospace Engineering, University of IllinoisUrbana, IL 61801, USA

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    Using self-healing materials in commercial applications requires healing chemistry that is cost-effective, widely available and tolerant of moderate temperature excursions. We investigate the use of tungsten (VI) chloride as a catalyst precursor for the ring-opening metathesis polymerization of exo-dicyclopentadiene (exo-DCPD) in self-healing applications as a means to achieve these goals. The environmental stability of WCl6 using three different delivery methods was evaluated and the associated healing performance was assessed following fracture toughness recovery protocols. Both as-received and recrystallized forms of the WCl6 resulted in nearly complete fracture recovery in self-activated tests, where healing agent is manually injected into the crack plane, at 12 wt% WCl6 loading. In situ healing using 15 wt% microcapsules of the exo-DCPD produced healing efficiencies of approximately 20%.

    Footnotes

    †Present address: 3M Corporate Research Laboratory, 3M Center Building 0201-03-N-04, St Paul, MN 55144-1000, USA.

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