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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Li, Qiong
Technical University of Denmark
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2024Wettability of Water- and Solvent-borne Epoxy Coatings on Contaminated Steel Substrates
- 2024Wettability of waterborne and solvent-based epoxy coatings on contaminated steel panels
- 2022Detection and quantification of premature crack formation in curing epoxy coatingscitations
- 2022Detection and quantification of premature crack formation in curing epoxy coatingscitations
- 2022Parallel measurements and engineering simulations of conversion, shear modulus, and internal stress during ambient curing of a two-component epoxy coatingcitations
- 2022Parallel measurements and engineering simulations of conversion, shear modulus, and internal stress during ambient curing of a two-component epoxy coatingcitations
- 2021Morphology and mechanical properties of fossil diatom frustules from genera of Ellerbeckia and Melosira
- 2021The evolution of coating properties and internal stress during ambient curing of a two-component epoxy coating
- 2021The evolution of coating properties and internal stress during ambient curing of a two-component epoxy coating
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article
Detection and quantification of premature crack formation in curing epoxy coatings
Abstract
Cracks and defects, as a result of internal stress during curing, can accelerate the degradation and failure of protective epoxy coatings for essential infrastructure. To reduce, or eliminate, this so-called premature crack formation, it is essential to understand the underlying mechanisms.<br/><br/>For a solvent-based novolac epoxy, cured with a cycloaliphatic amine, the present work investigated the simultaneous development in internal stress, the degree of conversion of reactants (i.e. crosslinking), the volumetric shrinkage, and the elastic modulus. In addition, the crack susceptibility of the coating was quantified from a stress-strain curve (tensile mode), and the effects of film thickness, solvent content, pigment volume concentration, and flat versus 90-degree angle geometry were mapped. Finally, digital microscopy, in combination with a non-destructive Scanning Acoustic Microscope (SAM) analysis, proved efficient for characterization of the crack morphology.<br/><br/>Residual solvent, due to plasticization, promotes a low crack susceptibility. Later in the process, however, the solvent plasticization contributes to a high reactant conversion, and when the solvent finally evaporates, an increased internal stress is established. This, in turn, leads to an associated higher probability for crack initiation and growth.<br/><br/>The crack susceptibility method provides insight and input to guidelines on how to modify formulations and curing conditions.