Journal
APPLIED CLAY SCIENCE
Volume 228, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.clay.2022.106624
Keywords
Sustainable material; Carboxymethyl chitosan aerogel; Montmorillonite; Sound absorption; Flame-retardancy
Funding
- National Natural Science Foundation of China [51273154, 52103065]
- Natural Science Foundation of Hubei Province [2017CFB289]
- scientific research fund of Wuhan Institute of Technology [K2021044]
- Guangdong Basic and Applied Basic Foundation [2019A1515110465]
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The porous structures of biomass-based aerogels can be regulated by adjusting the ratios of carboxymethyl chitosan (CCS) and montmorillonite (Mt). Hierarchically porous structures were obtained using a directional freeze method and freeze-drying process. The resulting CCS/Mt. aerogels exhibit excellent flame retardancy, with a limiting oxygen index reaching up to 85%, as well as super low density and high porosity. The honeycomb-like structure of the aerogels improves their sound absorption properties at low-frequency.
Different porous structures of biomass-based aerogels were regulated by adjusting the ratios of carboxymethyl chitosan (CCS) and montmorillonite (Mt). The hierarchically porous structures were obtained via a directional freeze method and the freeze-drying process. The diverse microstructures and flame retardant and sound absorption properties of as-prepared CCS/Mt. aerogels were studied. The results revealed that the incorporation of Mt. could dramatically improve the flame retardancy of the resultant aerogel, with the limiting oxygen index reaching up to 85%, attaining the nonflammable level. And the CCS/Mt. aerogels exhibit a super low density (33.85-38.27 mg/cm3) and high porosity (98.20%). The honeycomb-like structure of the aerogel could apparently improve the sound adsorption properties at low-frequency. Overall, this work provides a novel approach to develop bio-composites featured with excellent flame retardant and sound-adsorption properties that would find a broad range of potential applications as building material.
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