Fracture and fatigue response of a self-healing epoxy adhesive
| Autor: | Henghua Jin, Nancy R. Sottos, G. M. Miller, Scott R. White |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
Polymers and Plastics Organic Chemistry chemistry.chemical_element Epoxy Ruthenium chemistry.chemical_compound Monomer Fracture toughness chemistry Polymerization visual_art Dicyclopentadiene Materials Chemistry visual_art.visual_art_medium Fracture (geology) Adhesive Composite material |
| Zdroj: | Polymer. 52:1628-1634 |
| ISSN: | 0032-3861 |
| Popis: | A self-healing epoxy adhesive for bonding steel substrates is demonstrated using encapsulated dicyclopentadiene (DCPD) monomer and bis(tricyclohexylphosphine)benzylidine ruthenium (IV) dichloride (Grubbs’ first generation) catalyst particles dispersed in a thin epoxy matrix. Both quasi-static fracture and fatigue performance are evaluated using the width-tapered-double-cantilever-beam specimen geometry. Recovery of 56% of the original fracture toughness under quasi-static fracture conditions occurs after 24 h healing at room temperature conditions. Complete crack arrest is demonstrated for fatigue test conditions that render neat resin and control samples failed. Inspection of fracture surfaces by electron microscopy reveals evidence of polymerized DCPD after healing. These results are the first mechanical assessment of self-healing for thin (ca. 360 mm) films typical of adhesives applications. |
| Databáze: | OpenAIRE |
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