Autonomic Recovery of Fiber/Matrix Interfacial Bond Strength in a Model Composite
| Autor: | Scott R. White, Nancy R. Sottos, Marta Baginska, Benjamin J. Blaiszik |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Scanning electron microscope Bond strength Composite number Epoxy Condensed Matter Physics Electronic Optical and Magnetic Materials Biomaterials Matrix (chemical analysis) chemistry.chemical_compound chemistry Polymerization Dicyclopentadiene visual_art Self-healing Electrochemistry visual_art.visual_art_medium Composite material |
| Zdroj: | Advanced Functional Materials. 20:3547-3554 |
| ISSN: | 1616-301X |
| Popis: | Autonomic self-healing of interfacial damage in a model single-fi ber composite is achieved through sequestration of ca. 1.5 μ m diameter dicyclopentadiene (DCPD) healing-agent-fi lled capsules and recrystallized Grubbs’ catalyst to the fi ber/matrix interface. When damage initiates at the fi ber/matrix interface, the capsules on the fi ber surface rupture, and healing agent is released into the crack plane where it contacts the catalyst, initiating polymerization. A protocol for characterizing the effi ciency of interfacial healing for the singlefi ber system is established. Interfacial shear strength (IFSS), a measure of the bond strength between the fi ber and matrix, is evaluated for microbond specimens consisting of a single self-healing functionalized fi ber embedded in a microdroplet of epoxy. The initial (virgin) IFSS is equivalent or enhanced by the addition of capsules and catalyst to the interface and up to 44% average recovery of IFSS is achieved in self-healing samples after full interfacial debonding. Examination of the fracture interfaces by scanning electron microscopy reveals further evidence of a polyDCPD fi lm in self-healing samples. Recovery of IFSS is dictated by the bond strength of polyDCPD to the surrounding epoxy matrix. |
| Databáze: | OpenAIRE |
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