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http://hdl.handle.net/10773/35246
Title: | Thermoresponsive hybrid colloidal capsules as an inorganic additive for fire-resistant silicone-based coatings |
Author: | Pham, Sang T. Tieu, Anh Kiet Sencadas, Vitor Joseph, Paul Arun, Malavika Cortie, David |
Issue Date: | 24-Aug-2022 |
Publisher: | American Chemical Society |
Abstract: | Improving the fire-resistant efficiency of silicone based polymeric coatings is important in the building industry and electrical utilities. In this study, the water-containing hybrid calcium carbonate (CaCO3)−silica (SiO2) colloidal capsule has been developed and optimized as an inorganic flame-retardant additive. This capsule exhibits excellent thermal stability up to 1000 °C with a remaining intact hollow spherical structure. When used as an inorganic filler at 15 wt %, it not only reduces the potential fire hazards by over 44% (i.e., the sumHRC reduced from 112.00 J/g K to 62.00 J/g K) but also improves the heat-barrier efficiency by over 30% (i.e., the temperature at the steady state reduced from 350 to 360 °C to below 250 °C) of the silicone-based polymeric coatings. In addition, the capsule−polymer composite coating exhibits excellent ductility which can withstand heat-induced mechanical stresses and prevent crack propagation under radiative heating conditions. The fire-resistant mechanism of the colloidal capsule is related strongly to the encapsulated water core and the reactions between SiO2 and CaCO3 at elevated temperatures. They contribute to a cooling effect on the flammable pyrolysis gases but also induce an insulative effect on the resulting char during combustion. The significant advances in this study will have a high impact on customizing the functional inorganic additives for a better design of the flame-retardant composite coating. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/35246 |
DOI: | 10.1021/acs.iecr.2c01967 |
ISSN: | 0888-5885 |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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10.1021_acs.iecr.2c01967.pdf | 12.88 MB | Adobe PDF | View/Open |
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