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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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Adan, Olaf C. G.
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Publications (7/7 displayed)
- 2023Polymeric stabilization of salt hydrates for thermochemical energy storagecitations
- 2022Impact of polymeric stabilisers on the reaction kinetics of SrBr2citations
- 2021Encapsulation of salt hydrates by polymer coatings for low-temperature heat storage applicationscitations
- 2017Transport of a water-soluble polymer during drying of a model porous mediacitations
- 2013NMR study of the microstructures and water-polymer interactions in cross-linked polyurethane coatingscitations
- 2013Water permeability of pigmented waterborne coatingscitations
- 2012Quantitative water uptake study in thin nylon-6 films with NMR imagingcitations
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article
NMR study of the microstructures and water-polymer interactions in cross-linked polyurethane coatings
Abstract
The microstructure of a polymer coating plays an important role in the water uptake behavior. This paper aims to correlate the molecular mobility and the water–polymer interactions with the microstructures of a highly cross-linked PU system. GARfield NMR imaging was used to monitor in situ the water uptake of the PU coating at different temperatures. The results of continuum T2 fitting show that at temperatures below the enthalpy relaxation temperature (65 °C) the PU coating uptakes water, whereas the polymer matrix is not plasticized by the presence of water. At higher temperatures, however, the polymer matrix is significantly mobilized by the presence of water molecules as indicated by the appearance of the longer T2 component. The water content in the PU coating is monitored by GARfield NMR at different temperatures. The results show that the water content decreases in two steps as the temperature decreases from 85 °C to the room temperature. This result is explained in combination with the molecular relaxation phenomenon probed by the DSC. A microstructure model was formulated based on the experimental results.