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Rheological behavior of cellulose nanocrystal suspensions in polyethylene glycol

Quentin Beuguel, Jason Robert Tavares, Pierre J. Carreau and Marie-Claude Heuzey

Article (2018)

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Cite this document: Beuguel, Q., Tavares, J. R., Carreau, P. J. & Heuzey, M.-C. (2018). Rheological behavior of cellulose nanocrystal suspensions in polyethylene glycol. Journal of Rheology, 62(2), p. 607-618. doi:10.1122/1.5010789
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Abstract

The rheological behavior of cellulose nanocrystals (CNCs) in polar media based on polyethylene glycol (PEG) was investigated from aqueous suspensions to nanocomposites. The aim of this work is to improve our knowledge on the CNC behavior in polymer media and develop rheological indices to characterize the dispersion of nanoparticles in polymer matrices. CNCs were obtained from sulfuric acid hydrolysis of wood pulp and supplied after a spray- or freeze-drying process. Ultrasonication was used to break agglomerates and disperse CNCs in aqueous suspensions before mixing with an aqueous PEG solution at room temperature. The samples were subsequently dried and compression molded. From capillary and oscillatory shear rheology, no adsorption of PEG chains on CNCs could be detected, as many had previously hypothesized. The increase of PEG concentration in aqueous suspension favored the gelation by depletion effect and suggested CNC orientation. Viscoelastic properties and transmission electronic images of PEG/CNC nanocomposites highlighted the formation of a percolated network of CNCs for low concentrations ≥ 0.15 vol. %. From the model of Shih et al., a fractal dimension of 2 was obtained for these percolated nanocomposites, suggesting a 2D network of CNCs in the PEG matrix.

Open Access document in PolyPublie
Subjects: 1800 Génie chimique > 1800 Génie chimique
1800 Génie chimique > 1808 Rhéologie et transformation
Department: Département de génie chimique
Research Center: CREPEC - Centre de recherche sur les systèmes polymères et composites à haute performance
Funders: CRSNG/NSERC, Prima Québec, FPInnovations
Grant number: RDCPJ 490786-15
Date Deposited: 02 Mar 2018 13:38
Last Modified: 24 Oct 2018 16:12
PolyPublie URL: https://publications.polymtl.ca/3005/
Document issued by the official publisher
Journal Title: Journal of Rheology (vol. 62, no. 2)
Publisher: Society of Rheology/AIP
Official URL: https://doi.org/10.1122/1.5010789

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