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The structural amphiphilicity of cellulose nanocrystals characterized from their cohesion parameters

Charles Bruel, Jason Robert Tavares, Pierre J. Carreau and Marie-Claude Heuzey

Article (2019)

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Cite this document: Bruel, C., Tavares, J. R., Carreau, P. J. & Heuzey, M.-C. (2019). The structural amphiphilicity of cellulose nanocrystals characterized from their cohesion parameters. Carbohydrate Polymers, 205, p. 184-191. doi:10.1016/j.carbpol.2018.10.026
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Abstract

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: δD; δP; δH) of woodbased 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 non-polar 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 2.1MPa1/2. The polar sphere is thought to correspond to the (110)&(110) surfaces of cellulose Iβ 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 affnity for solvents and polymer matrices.

Uncontrolled Keywords

cellulose nanocrystals, surface properties, structure-property relationships, chemical affnity, amphiphilicity, Hansen solubility parameters

Open Access document in PolyPublie
Subjects: 1800 Génie chimique > 1800 Génie chimique
Department: Département de génie chimique
Research Center: CREPEC - Centre de recherche sur les systèmes polymères et composites à haute performance
Funders: FPInnovations, PRIMA Québec, CRSNG / NSERC, Fond de Recherche du Québec - Nature et Technologies (FRQNT), Celluforce
Grant number: FPI NCC RD001, RDCPJ 490786-15, 208324
Date Deposited: 16 Jan 2020 10:26
Last Modified: 17 Jan 2020 01:20
PolyPublie URL: https://publications.polymtl.ca/4111/
Document issued by the official publisher
Journal Title: Carbohydrate Polymers (vol. 205)
Publisher: Elsevier
Official URL: https://doi.org/10.1016/j.carbpol.2018.10.026

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