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All-natural and highly flame-resistant freeze-cast foams based on phosphorylated cellulose nanofibrils†
Nanoscale ( IF 5.8 ) Pub Date : 2018-02-06 00:00:00 , DOI: 10.1039/c7nr09243a Maryam Ghanadpour 1, 2, 3, 4 , Bernd Wicklein 5, 6, 7 , Federico Carosio 8, 9, 10, 11, 12 , Lars Wågberg 1, 2, 3, 4, 13
Nanoscale ( IF 5.8 ) Pub Date : 2018-02-06 00:00:00 , DOI: 10.1039/c7nr09243a Maryam Ghanadpour 1, 2, 3, 4 , Bernd Wicklein 5, 6, 7 , Federico Carosio 8, 9, 10, 11, 12 , Lars Wågberg 1, 2, 3, 4, 13
Affiliation
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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.
中文翻译：
基于磷酸化纤维素纳米原纤维的纯天然且高度阻燃的速冻泡沫†
纯纤维素泡沫具有低的热稳定性和高的可燃性，从而限制了其应用领域。在此，通过使用冷冻浇铸技术将由磷酸化纸浆纤维（P-CNF）制成的纤维素纳米原纤维与微纤维海泡石粘土混合，制得了轻质且阻燃的纳米结构泡沫。除主要归因于磷酸化原纤维的固有炭化能力和海泡石形成热防护能力的高阻燃性外，所得的纳米复合泡沫材料还具有出色的阻燃性能，例如自熄性能和极低的放热速率。材料表面上的膨胀状屏障。通过FTIR和固态NMR光谱对炭化残渣的化学结构进行的研究表明，由于改性纤维素的脱磷酸作用以及由于酸性催化作用而导致的进一步脱水，导致了碳水化合物的广泛石墨化。由于海泡石颗粒的纳米级尺寸，其高的比表面积和刚度以及其与磷酸化原纤维的紧密相互作用，粘土纳米棒的掺入也显着提高了纳米复合泡沫的机械强度和刚度。在这项研究中制备的新型泡沫料有望在可持续建筑中具有巨大的应用潜力。
更新日期：2018-02-06
中文翻译：
基于磷酸化纤维素纳米原纤维的纯天然且高度阻燃的速冻泡沫†
纯纤维素泡沫具有低的热稳定性和高的可燃性，从而限制了其应用领域。在此，通过使用冷冻浇铸技术将由磷酸化纸浆纤维（P-CNF）制成的纤维素纳米原纤维与微纤维海泡石粘土混合，制得了轻质且阻燃的纳米结构泡沫。除主要归因于磷酸化原纤维的固有炭化能力和海泡石形成热防护能力的高阻燃性外，所得的纳米复合泡沫材料还具有出色的阻燃性能，例如自熄性能和极低的放热速率。材料表面上的膨胀状屏障。通过FTIR和固态NMR光谱对炭化残渣的化学结构进行的研究表明，由于改性纤维素的脱磷酸作用以及由于酸性催化作用而导致的进一步脱水，导致了碳水化合物的广泛石墨化。由于海泡石颗粒的纳米级尺寸，其高的比表面积和刚度以及其与磷酸化原纤维的紧密相互作用，粘土纳米棒的掺入也显着提高了纳米复合泡沫的机械强度和刚度。在这项研究中制备的新型泡沫料有望在可持续建筑中具有巨大的应用潜力。
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