Li Jiaoyang, Lu Zhaoqing, Xie Fan, Huang Jizhen, Ning Doudou, Zhang Meiyun
College of Bioresources Chemical and Materials Engineering, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an, 710021, China.
College of Bioresources Chemical and Materials Engineering, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an, 710021, China.
Carbohydr Polym. 2021 Jun 1;261:117837. doi: 10.1016/j.carbpol.2021.117837. Epub 2021 Feb 19.
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 freeze-drying 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/m which also had low thermal conductivity about 28.8 mW/m · K. The ANF improved the flame retardancy of the composite foam.
泡沫作为一种具有层状多孔三维结构的新兴材料，在多个领域实现了多功能应用。在本工作中，我们旨在通过绿色水相冷冻干燥法制备一种具有各向异性多孔三维结构的高压缩性和自熄性多功能纳米复合泡沫。为了解决高负载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纤维素纳米纤维骨架中，形成纳米复合泡沫的多组分和多级蜂窝结构。在此，通过添加50 wt.%的芳纶纳米纤维，纳米复合泡沫的压缩循环性能可得到显著改善，即使在200次循环压缩后，在20%应力下仍能100%恢复。纳米复合泡沫的总热释放低至2.12 MJ/m，其热导率也很低，约为28.8 mW/m·K。芳纶纳米纤维提高了复合泡沫的阻燃性。
