期刊
INDUSTRIAL CROPS AND PRODUCTS
卷 139, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.indcrop.2019.111580
关键词
Nanocellulose; Aerogels; Electrostatic adsorption; Chemical crosslinking
资金
- National Natural Science Foundation of China [51603159]
- Natural Science Foundation of Hubei Province [2017CFB490]
- Anhui Province Key Laboratory of Environment-friendly Polymer Materials [KF2019004]
Nanocelluloses including rigid cellulose nanocrystals (CNC) and semi-flexible cellulose nanofibrils (CNF) have recently gained much attention as the high-added nanomaterials from renewable resources. These nanoparticles with high aspect ratio are widely used as reinforcing agents in composites and porous materials. In this study, a dual-enhancement strategy based on the electrostatic adsorption and chemical crosslinking was proposed to improve the mechanical properties of composite aerogels based on the combination of TEMPO-oxidized CNF and cationic CNC aided with sodium alginate (SA) and crosslinked by three isocyanate reagents. The resultant aerogels are ultralight ( < 0.06 g/cm(3)), highly porous ( > 96%) and hydrophobic materials (water contact angle > 100 degrees), with the simultaneous increase of compression modulus, compression strength and compression energy by three orders of magnitude. The dual-enhancement strategy developed in here presents a novel approach to design the nanocellulose-based porous materials with remarkable enhancement of mechanical properties and potential applications in diverse functional materials.
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