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Dual-enhancement effect of electrostatic adsorption and chemical crosslinking for nanocellulose-based aerogels

Zhu, Ge, Chen, Ziyang, Wu, Bolang, Lin, Ning
Industrial crops and products 2019 v.139 pp. 111580
adsorption, aerogels, cellulose, cellulose nanofibers, compression strength, contact angle, crosslinking, energy, hydrophobicity, mechanical properties, nanocrystals, nanoparticles, porous media, renewable resources, sodium alginate
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/cm3), highly porous (> 96%) and hydrophobic materials (water contact angle > 100°), 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.