In-situ incorporation of metal phytates for green and highly efficient flame-retardant wood with excellent smoke-suppression property

阻燃剂 烧焦 炭化 烟雾 材料科学 膨胀的 燃烧 化学工程 金属 氮气 纤维素乙醇 纤维素 化学 复合材料 有机化学 冶金 工程类
作者
Shaodi Zhang,Xuan Wang,Mengyi Ding,Yuxiang Huang,Li Li,Mingzhi Wang
出处
期刊:Industrial Crops and Products [Elsevier BV]
卷期号:187: 115287-115287 被引量:34
标识
DOI:10.1016/j.indcrop.2022.115287
摘要

Phytic acid (PA) have attracted rapidly growing attention as a bio-based and effective flame retardant for cellulosic materials. However, they produce much toxic smoke during the combustion, which severely threats human life. To address this problem, in this work, metal phytates were in-situ incorporated into the wood matrix via a simple two-step approach to fabricate green and highly efficient flame-retardant wood (PM-W, M = Cu, Fe, Zn, and Mg) with excellent smoke-suppression property. PCu-W exhibits 44.77 % and 91.98 % smaller total heat release and total smoke production than W, respectively, with a weight percent gain of only 13.06 %, outperforming most of its previous counterparts. The improvements can be mainly ascribed to the significant dual-charring effect of metal phytates, and the catalytic graphitizing effect of metallic species on the char residue. The high-quality char layer act as an efficient isolating barrier to restrict the emission of smoke. Moreover, PCu-W shows superior performances to other PM-Ws owing not only to the stronger Lewis acidity of Cu 2+ , but also to the lower nitrogen solubility of metallic Cu, which increased the nitrogen content in the graphitic structure and accordingly enhanced the stability of the char. This work provides guidelines for designing green and safer strategy to address the fire hazard of wood or other cellulosic materials by PA-derived flame retardants. • Metal phytates were in-situ incorporated into wood matrix via a facile method. • PM-Ws have outstanding flame retardancy and smoke suppression performance. • The improvement is ascribed to dual-charring and catalytic graphitizing effects. • Smoke-suppression performance of PCu-W outperforms other PM-Ws.
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