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

Author:
Zhu, Ge, Chen, Ziyang, Wu, Bolang, Lin, Ning
Source:
Industrial crops and products 2019 v.139 pp. 111580
ISSN:
0926-6690
Subject:
adsorption, aerogels, cellulose, cellulose nanofibers, compression strength, contact angle, crosslinking, energy, hydrophobicity, mechanical properties, nanocrystals, nanoparticles, porous media, renewable resources, sodium alginate
Abstract:
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.
Agid:
6544738