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Shoulu Yang,Zhongwei Wang,Zhu Liu,Ning Ji,Yiqiang Wu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.119 No.-
A novel hybrid material derived from wood and acid nanospheres was synthesized by facile in-situ selfassemblyof phosphotungstic acid (HPW) and triethylamine (TEA) at room temperature. The uniformlydispersed amphiphilic TEA-PW nanospheres furnished the wood with controlled particle sizes, and theacid capacity of the material could be altered by varying the molar ratio of HPW and TEA. Furthermore, the TEA-PW/wood hybrid had good anti-leach properties, which were attributed to the acidnanospheres’ amphiphilicity. Notably, the hybrid material displayed excellent flame-retardant characteristicseven with a low dose of the TEA-PW nanospheres (only 18.6 mass %), resulting in a UL-94V-0 ratingand a 41.4% and 44.8% decrease in the pk-HRR and TSR of the untreated wood, respectively. Effectiveflame retardation was primarily attributed to synergistic effects, molecular firefighting properties, andcatalytic carbon reactions in the condensed phase high-density nitrogen-phosphorus-oxygen crosslinkingnetwork carbon layer, as well as the capture or dilution of flammable gases by free radicals. Inconclusion, this hybrid material may provide new possibilities for the development of fire-resistantwoods.
Yiqiang Wu,Chunhua Yao,Yunchu Hu,Shoulu Yang,Yan Qing,Qinglin Wu 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Flame retardancy and thermal degradation of wood treated with magnesium chloride (MgCl2 6H2O) were investigated. Results showed that MgCl2 6H2O decreased flame intensity and heat release rate, and reduced smoke concentration and gas yield. From ambient temperature to 250 ℃, MgCl2 6H2O reduced wood combustibility by gas dilution mechanism. The chemical started to decompose at 350 8C and produced MgOHCl, in which -Cl and -Mg free radicals were generated and intervened the chain reactions of wood combustion. Hydrogen chloride gas generated promoted wood charring. MgCl2 6H2O gradually converted to MgOHCl and MgO compounds at higher temperatures, and MgO suppressed wood combustion by the wall effect mechanism.