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Enhanced flame retardancy of modified β-cyclodextrin doped silica fume-based geopolymeric coating covered on plywood
Graphical abstract Display Omitted
Highlights 1 wt% modified β-CD imparts an enhanced flame retardancy to the geopolymeric coating. The crosslinking makes the Eα rise from 132.1 to 185.5 kJ·mol−1 at 1000–689 °C. The flame-retarding mechanism in modified β-CD doped geopolymeric coating is elaborated.
Abstract A novel β-cyclodextrin (β-CD)/silica fume-based coating is prepared by sol-gel method to seek ecological and environmentally friendly flame retardants, which is employed for flame-retarding plywood extensively used as the decorative materials. The flame-retarding mechanism is elaborated through microstructure characterizations and pyrolysis kinetics. The results show that an appropriate dosage of γ-aminopropyl triethoxysilane modified β-CD (1 wt%) enhances the flame retardancy of the geopolymeric coating, the peak of heat release rate decreases from 125.95 kW·m−2 to 59.65 kW·m−2, the flame retardancy index climbs from 1 to 4.06. Because of the hydrogen-bonding crosslinking, filling, and subsequent adsorption, the coating transforms into an interpenetrating network, compact, and non-combustible layer during firing, thus blocking the transfer of heat or mass, leading to an increase in the pyrolysis Eα (it rises from 132.1 to 185.5 kJ·mol−1 at 1000–689 °C) according to the three-level chemical reaction model (F3). It explores an efficient approach for designing Si/C hybrid fireproof coatings with biomaterials and metallurgical solid waste, promoting the development of green flame retardant technologies.
Enhanced flame retardancy of modified β-cyclodextrin doped silica fume-based geopolymeric coating covered on plywood
Graphical abstract Display Omitted
Highlights 1 wt% modified β-CD imparts an enhanced flame retardancy to the geopolymeric coating. The crosslinking makes the Eα rise from 132.1 to 185.5 kJ·mol−1 at 1000–689 °C. The flame-retarding mechanism in modified β-CD doped geopolymeric coating is elaborated.
Abstract A novel β-cyclodextrin (β-CD)/silica fume-based coating is prepared by sol-gel method to seek ecological and environmentally friendly flame retardants, which is employed for flame-retarding plywood extensively used as the decorative materials. The flame-retarding mechanism is elaborated through microstructure characterizations and pyrolysis kinetics. The results show that an appropriate dosage of γ-aminopropyl triethoxysilane modified β-CD (1 wt%) enhances the flame retardancy of the geopolymeric coating, the peak of heat release rate decreases from 125.95 kW·m−2 to 59.65 kW·m−2, the flame retardancy index climbs from 1 to 4.06. Because of the hydrogen-bonding crosslinking, filling, and subsequent adsorption, the coating transforms into an interpenetrating network, compact, and non-combustible layer during firing, thus blocking the transfer of heat or mass, leading to an increase in the pyrolysis Eα (it rises from 132.1 to 185.5 kJ·mol−1 at 1000–689 °C) according to the three-level chemical reaction model (F3). It explores an efficient approach for designing Si/C hybrid fireproof coatings with biomaterials and metallurgical solid waste, promoting the development of green flame retardant technologies.
Enhanced flame retardancy of modified β-cyclodextrin doped silica fume-based geopolymeric coating covered on plywood
Wang, YaChao (author) / Kou, Xiaofei (author) / Shi, Hongxing (author) / Zhao, JiangPing (author) / Deng, Jun (author) / A, Xin (author)
2022-03-18
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2018