UV Fluorescent Epoxy Adhesives from Noncovalent and Covalent Incorporation of Coumarin Dyes
| Autor: | Yizheng Zhang, Douglas A. Loy, Pamela B. Vandiver, Liliana A. Argüello, Peter Mcfadden, Nancy Odegaard, Kevin M. Frederick |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Materials science Thermosetting polymer 02 engineering and technology Polymer Epoxy 010402 general chemistry 021001 nanoscience & nanotechnology Coumarin 01 natural sciences Combinatorial chemistry Fluorescence 0104 chemical sciences Solvent chemistry.chemical_compound chemistry Covalent bond visual_art Polymer chemistry visual_art.visual_art_medium General Materials Science Adhesive 0210 nano-technology |
| Zdroj: | ACS Applied Materials & Interfaces. 9:10061-10068 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.6b13218 |
| Popis: | Epoxies are commonly used in art conservation as adhesives for artifact reconstruction and repair. However, with the development of colorless epoxies, it has become more difficult to detect repair work. Fluorescent epoxies would allow for easy detection of the epoxy joints by simple visual inspection under UV light while remaining unnoticeable under normal display lighting. Coumarins are natural dyes that can be added in very small amounts to make thermosets fluoresce. Depending on the functionality of the coumarin used, the dye may be physically encapsulated in the cross-linked polymer or it may be bound to the polymer through covalent bonds. In this paper, we examine the efficacy of coumarin (1) and coumarin 480 (2) as physically encapsulated dyes and 7-hydroxycoumarin (3) and 7-glycidyloxycoumarin (4) as covalently bound dyes in a commercial epoxy thermoset, Epo-Tek 301. All four dyes could be used to make the epoxy fluorescent, but coumarins 1 and 2 slightly reduced the lap shear strength of the thermoset and could be extracted with solvent. In contrast, coumarins 3 and 4 had little effect on the mechanical properties of the epoxy and only minute amounts could be extracted. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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