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首页> 外文期刊>Composites Science and Technology >Recyclable nanocomposite foams of Poly(vinyl alcohol), clay and cellulose nanofibrils - Mechanical properties and flame retardancy
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Recyclable nanocomposite foams of Poly(vinyl alcohol), clay and cellulose nanofibrils - Mechanical properties and flame retardancy

机译：聚乙烯醇，粘土和纤维素纳米原纤维的可回收纳米复合泡沫材料-机械性能和阻燃性

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摘要

Foam-like clay-nanocellulose hybrids are of great interest as load-bearing structural foams with excellent fire retardancy, due to unique effects from clay on thermal cellulose degradation. For the first time, the fire retardancy of clay-nanocellulose foams are studied in detail, in particular the effect of a third polymer phase, poly(vinyl alcohol). The composition with optimum mechanical properties and fire retardancy is identified and analyzed. Foams are prepared by freeze-drying and the compositions are varied systematically. Thermogravimetric analysis is performed on foam degradation. Mechanical properties from compression tests and fire retardancy data from cone calorimetry are reported, together with cellular structures from SEM and relative density estimates for the foams. Self-extinguishing foams are obtained with superior flame retardancy to commercial polymer foams. Addition of poly(vinyl alcohol) is beneficial for mechanical properties of clay-nanocellulose foams, but impedes the fire retardancy by reducing clay-cellulose synergies and cellulose charring during degradation.
机译：由于粘土对纤维素热降解的独特作用，泡沫状粘土-纳米纤维素杂化物作为具有优异阻燃性的承重结构泡沫备受关注。首次详细研究了粘土-纳米纤维素泡沫的阻燃性，特别是第三种聚合物相（聚乙烯醇）的影响。鉴定并分析了具有最佳机械性能和阻燃性的组合物。通过冷冻干燥来制备泡沫，并且系统地改变组成。对泡沫降解进行热重分析。报告了来自压缩测试的机械性能和来自锥形量热法的阻燃性数据，以及来自SEM的孔结构和泡沫的相对密度估计值。获得的自熄泡沫具有比商业聚合物泡沫优异的阻燃性。聚乙烯醇的添加有利于粘土-纳米纤维素泡沫的机械性能，但是通过降低降解过程中的粘土-纤维素协同作用和纤维素炭化而阻碍了阻燃性。

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