Journal
CARBOHYDRATE POLYMERS
Volume 261, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2021.117837
Keywords
Cellulose nanofiber (CNF); Aramid nanofiber (ANF); Nanocomposite foam; Highly compressible; Thermally stable
Categories
Funding
- National Natural Science Foundation of China [51803110]
- National Key Research and Development Plan [2017YBF0308302]
- Shaanxi Natural Science Basic Research Program [2020JQ-724]
- Xi'an Science and Technology Project [2019220114SYS016CG038]
- Zhejiang Province key research and development project [2019C04008]
- Opening Foundation of Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry [KFKT2020-07]
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This study developed a highly compressible and self-extinguishing multifunctional nanocomposite foam with an anisotropic porous 3D structure through a green aqueous freezedrying method. By incorporating aramid nanofiber into the framework of cellulose nanofiber, the multilevel honeycomb structure of the nanocomposite foam was formed, improving compression cycle properties and reducing total heat release and thermal conductivity. The aramid nanofiber significantly enhanced the flame retardancy of the composite foam.
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.
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