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Tailoring cellulose nanocrystals rheological behavior in aqueous suspensions through surface functionalization with polyethyleneimine

Dhriti Khandal, Bernard Riedl, Jason Robert Tavares, Pierre J. Carreau and Marie-Claude Heuzey

Article (2019)

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Cite this document: Khandal, D., Riedl, B., Tavares, J. R., Carreau, P. J. & Heuzey, M.-C. (2019). Tailoring cellulose nanocrystals rheological behavior in aqueous suspensions through surface functionalization with polyethyleneimine. Physics of Fluids, 31(2), 021207. doi:10.1063/1.5046669
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The present paper reports the surface modification of commercially available cellulose nanocrystals (CNCs) using polyethyleneimine (PEI) by means of non-covalent electrostatic interaction between the negatively charged sulfate groups of CNCs and positively charged amine functionalities of PEI. The modification, carried out in an aqueous medium, results in a stable CNC-PEI suspension with no phase separation that exhibit interesting rheological behavior due to bridging-type inter-particle interactions. The Newtonian 3% (w/w) CNC suspension evolves into a non-Newtonian gel system after modification with PEI with a consequent increase of almost three decades in complex viscosity. Preshearing of the 3% (w/w) CNC-PEI suspension resulted in the loss of the linear viscoelastic properties with increasing shear rate, as would be expected from the breaking of the inter-particle network. However, the system gradually re-established the inter-particle network in less than an hour to give the original rheological parameters. The effect of PEI on the rheological properties was attributed to the physical adsorption of PEI chains on the CNC particles, examined by dynamic light scattering (DLS), zeta potential, X-ray photoelectron spectroscopy (XPS), elemental analyses, and isothermal adsorption studies. The modified CNC-PEI particles did not show any significant change in the particle morphology compared to the unmodified CNCs, as observed from transmission electron microscope (TEM) images.

Uncontrolled Keywords

Cellulose Nanocrystals (CNCs), polyethyleneimine (PEI), non-covalent modification, rheology, bridging network, non-Newtonian gel system

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: CelluForce, NSERC, PRIMA Québec, FPInnovations
Date Deposited: 16 Jan 2020 11:26
Last Modified: 08 Apr 2021 10:42
PolyPublie URL: https://publications.polymtl.ca/4131/
Document issued by the official publisher
Journal Title: Physics of Fluids (vol. 31, no. 2)
Publisher: AIP Publishing
Official URL: https://doi.org/10.1063/1.5046669


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