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All-natural and highly flame-resistant freeze-cast foams based on phosphorylated cellulose nanofibrils

机译：纯天然、高耐火的freeze-cast基于磷酸纤维素的泡沫纺锤

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摘要

Pure cellulosic foams suffer from low thermal stability and high flammability, limiting their fields of application. Here, light-weight and flame-resistant nanostructured foams are produced by combining cellulose nanofibrils prepared from phosphorylated pulp fibers (P-CNF) with microfibrous sepiolite clay using the freeze-casting technique. The resultant nanocomposite foams show excellent flame-retardant properties such as self-extinguishing behavior and extremely low heat release rates in addition to high flame penetration resistance attributed mainly to the intrinsic charring ability of the phosphorylated fibrils and the capability of sepiolite to form heat-protective intumescent-like barrier on the surface of the material. Investigation of the chemical structure of the charred residue by FTIR and solid state NMR spectroscopy reveals the extensive graphitization of the carbohydrate as a result of dephosphorylation of the modified cellulose and further dehydration due to acidic catalytic effects. Originating from the nanoscale dimensions of sepiolite particles, their high specific surface area and stiffness as well as its close interaction with the phosphorylated fibrils, the incorporation of clay nanorods also significantly improves the mechanical strength and stiffness of the nanocomposite foams. The novel foams prepared in this study are expected to have great potential for application in sustainable building construction.
机译：纯纤维素泡沫患低热稳定和高易燃性,限制他们领域的应用。耐火的纳米泡沫产生通过结合纤维素纺锤准备磷酸化(P-CNF)与纸浆纤维microfibrous海泡石粘土使用freeze-casting技术。纳米复合材料泡沫表现优秀的阻燃性能等自熄的行为和极低除了高火焰热释放率贯入阻力主要归因于磷酸化的内在烧焦能力原纤维和海泡石形成的能力在隔热intumescent-like障碍表面的材料。化学结构的红外光谱的烧焦的残渣和固态核磁共振光谱揭示了广泛的石墨化的碳水化合物修改后的脱磷酸化的结果由于酸性纤维素和进一步脱水催化效果。海泡石粒子的尺寸,他们的高比表面积和刚度与磷酸化的密切互动原纤维的掺入粘土纳米棒大大提高了机械强度和刚度的纳米复合材料泡沫。小说在这项研究预计泡沫准备有巨大的应用潜力可持续发展的建筑。

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