Journal
CARBOHYDRATE POLYMERS
Volume 242, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.116422
Keywords
Microcrystalline cellulose; Phosphorylation; Aerogel; Toxic-gas suppression; Flame retardancy
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Funding
- Shandong Province Key Research and Development Plan of China (Public Welfare Project) [2017GGX20135]
- Shandong Province Natural Science Foundation of China [2016ZRBM17]
- National Natural Science Foundation of China [21104038]
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Flame-retardant bio-based cellulose aerogels, with abundant renewable sources, are considered as promising sustainable heat-insulation alternatives to conventional petroleum-based foams. An environmentally friendly method was employed to fabricate phosphorylated microcrystalline cellulose (PMCC) aerogel through the ge-lation of PMCC/H2O dispersion and freeze-drying of PMCC hydrogel. The dispersion stability of PMCC and its readiness to undergo gelation in the aqueous phase were enhanced by increasing the phosphorous content via phosphorylation, thereby effectively weakening the strong intra- and intermolecular hydrogen-bond interactions of the cellulose chains. The morphology of the PMCC aerogel changed from a short rod-shaped and sheet-like aggregation of a three-dimensional skeleton structure to a mostly sheet-like aggregation of a three-dimensional structure with increased phosphate esterification. Remarkably, PMCC aerogels exhibited improved flame re-tardancy and superior suppression of toxic gas, compared to MCC. This is attributable to the synergic effect of phosphate dehydration, catalytic carbonization, and protection of the aerogel network structure.
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