A novel flame retardant containing cellulose, phosphorus and ferrum complex (Cell‐P‐Fe) was successfully synthesized and then it was used as flame retardants in epoxy resins (EP). Due to the present of acid sources and carbon sources, the Cell‐P‐Fe exhibits improved thermal stability and flame retardant properties. The EP/Cell‐P‐Fe composites with 10 wt% of Cell‐P‐Fe show remarkably improved LOI and UL‐94 values compared with the flame retardants without ferrum. At the loading of 10.0 wt% flame retardants, the char yield for EP/Cell‐P‐Fe composites increased to 29.1 wt%, indicating the improved thermal stability at high temperature. Moreover, thermogravimetric analysis, morphology of char residues and FTIR results demonstrate that stable char layers are formed on the surface of the composites during the combustion, attributing to the catalytic carbonization effect of Fe and phosphorus and the present of cellulose as carbon source. The stable char layers, which can protect the underlying materials from heat and oxygen, play an important role in the flame retardancy enhancement.

中文翻译：

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磷酸纤维素/ Fe3 +络合物：新型的环氧树脂阻燃剂

已成功合成了一种新型的包含纤维素，磷和铁元素（Cell-P-Fe）的阻燃剂，然后将其用作环氧树脂（EP）的阻燃剂。由于存在酸源和碳源，Cell-P-Fe具有更好的热稳定性和阻燃性。与不含铁的阻燃剂相比，含10％（重量）Cell-P-Fe的EP / Cell-P-Fe复合材料的LOI和UL-94值显着提高。在添加10.0 wt％的阻燃剂时，EP / Cell-P-Fe复合材料的炭收率提高到29.1 wt％，这表明高温下的热稳定性得到改善。此外，热重分析，炭渣的形态和FTIR结果表明，在燃烧过程中，复合材料表面形成了稳定的炭层，归因于铁和磷的催化碳化作用以及纤维素作为碳源的存在。可以保护下面的材料免受热和氧气影响的稳定炭层在增强阻燃性方面起着重要作用。