Journal
CARBOHYDRATE POLYMERS
Volume 205, Issue -, Pages 184-191Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.10.026
Keywords
Cellulose nanocrystals; Surface properties; Structure-property relationships; Chemical affinity; Amphiphilicity; Hansen solubility parameters
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Funding
- FPInnovations (Pointe-Claire, QC, Canada), of PRIMA Quebec [FPI NCC RD001]
- National Science and Engineering Research Council (NSERC) [RDCPJ 490786-15]
- Fond de Recherche du Quebec - Nature et Technologies (FRQNT) [208324]
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Cellulose nanocrystals (CNCs), usually considered as isotropically polar nanoparticles, are sheet-like crystalline assemblies of cellulose chains. Here, we link the anisotropy of the CNC structure to an amphiphilic behavior in suspension. The Hansen solubility parameters (HSP: delta(D);delta(P);delta(H)) of wood-based H2SO4-hydrolyzed CNCs were measured from sedimentation tests in a wide set of 59 solvents and binary mixtures. Two sets of cohesion parameters corresponding to a polar surface (18.1; 20.4; 15.3) +/- (0.5; 0.5; 0.4) MPa1/2 and to a mildly nonpolar one (17.4; 4.8; 6.5) +/- (0.3; 0.5; 0.6) MPa1/2 were determined, with respective solubility radii of 7.8 and 2.1 MPa1/2. The polar sphere is thought to correspond to the (110) & (110) surfaces of cellulose I-beta nanocrystals, while the smaller non-polar sphere is coherent with the exposure of (200) surfaces. The HSP graph provides new insights on the amphiphilic nature of CNCs and a mapping of their chemical affinity for solvents and polymer matrices.
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