Preparation and characterization of durable micro/nanocapsules for use in self-healing anticorrosive coatings |
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| Authors: | Tahere Ebrahimi Sadrabadi Saeed Reza Allahkaram Torsten Staab Naser Towhidi |
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| Institution: | 1.School of Metallurgy and Materials Engineering, College of Engineering,University of Tehran,Tehran,Iran;2.Department of Chemical Technology of Material Synthesis,University of Würzburg,Würzburg,Germany |
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| Abstract: | In the field of coatings, extensive laboratory research has been conducted in the last decade. In the present work, effectiveness of epoxy resin filled micro/nanocapsules was investigated for future using in healing of cracks generated in coatings. Micro/nanocapsules were prepared by in situ polymerization of urea–formaldehyde resin to form shell over epoxy resin droplets. The optimal process parameters for synthesizing the micro/nanocapsules were selected. The as-synthesized capsules were studied by various characterizations techniques, including scanning electron microscope (SEM), particle size analyzer (PSA), Fourier transform-infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The results indicate that micro/nanocapsules containing epoxy resins can be synthesized successfully. The rough outer surface of microcapsule is composed of agglomerated urea–formaldehyde nanoparticles. They basically exhibit good storage stability at room temperature, and they are chemically stable before the heating temperature is up to approximately 250°C. |
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