Highly compressible, heat-insulating and self-extinguishing cellulose nanofiber/aramid nanofiber nanocomposite foams
Highly compressible, heat-insulating and self-extinguishing cellulose nanofiber/aramid nanofiber nanocomposite foams
复制标题
高压缩性、隔热性和自熄性纤维素纳米纤维/芳纶纳米纤维纳米复合泡沫
DOI：
10.1016/j.carbpol.2021.117837
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发表时间：
2021-03-05
影响因子：
11.2
通讯作者：
Zhang, Meiyun
中科院分区：
文献类型：
--
作者：
Li, Jiaoyang;Lu, Zhaoqing;Zhang, Meiyun
泡沫作为一种具有层状多孔3D结构的新兴材料，实现了在多个领域的多功能应用。在这项工作中，我们的目标是通过绿色水冻干燥方法制备具有各向异性多孔3D结构的高可压缩性和自熄性多功能纳米复合泡沫。为了解决高填充纤维素纳米纤维泡沫的易燃性和脆性问题，将芳纶纳米纤维引入到纤维素纳米纤维骨架中，形成多组分、多层次的纳米复合泡沫的蜂窝结构。其中，通过添加50wt.%芳纶纳米纤维可以显着改善纳米复合泡沫的压缩循环性能，并且即使循环压缩200次，在20%应力下也能恢复100%。纳米复合泡沫的总放热量低至2.12 MJ/m2，导热系数也较低，约为28.8 mW/m ? K. ANF提高了复合泡沫的阻燃性。
Foam as a kind of burgeoning materials with laminated porous 3D structure was realized multifunctional application in diversified fields. In this work, we aimed to prepare a highly compressible and self-extinguishing multifunctional nanocomposite foam with anisotropic porous 3D structure through a green aqueous freezedrying method. In order to address the inflammable property and brittleness issue of high-loading cellulose nanofiber foam, aramid nanofiber was incorporated into cellulose nanofiber framework, forming the multicomponent and multilevel honeycomb structure of the nanocomposite foam. Herein, the compression cycle properties of the nanocomposite foam could be significantly improved by adding 50 wt.% aramid nanofiber and at 20% stress recovered by 100 % even if cyclically compressed 200 times. The total heat release of the nanocomposite foam was as low as 2.12 MJ/m2 which also had low thermal conductivity about 28.8 mW/m ? K. The ANF improved the flame retardancy of the composite foam.