The effect of consistency on the shear rheology of aqueous suspensions of cellulose micro- and nanofibrils: a review

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Abstract

While the raw material type and the production method of cellulose micro- and nanofibrils (CMNFs) strongly affect the absolute values of the rheological parameters of their aqueous suspensions, the dependence of these parameters on consistency, c, is found to be uniform. The consistency index and yield stress of CMNF suspensions follow generally the scaling laws K∼c2.43 and τy∼c2.26 , respectively, and a decent approximation for flow index is n=0.30×c−0.43 . The variability of reported scaling exponents of these materials is likely mainly due to experimental uncertainties and not so much due to fundamentally different rheology. It is suggested that the reason behind the apparently universal rheological behavior of CMNF suspensions is the strong entanglement of fibrils; the flow dynamics of typical CMNF suspensions is dominated by interactions between fibril flocs and not by interactions between individual fibrils.
Original languageEnglish
Pages (from-to)1879-1897
JournalCellulose
Volume27
Issue number4
DOIs
Publication statusPublished - Mar 2020
MoE publication typeA2 Review article in a scientific journal

Funding

Open access funding provided by VTT Technical Research Centre of Finland Ltd. This project received funding from the European Union Horizon 2020 research and innovation programme under grant agreement No. 713475. The work is part of the Academy of Finland's Flagship Programme under Project No. 318891 (Competence Center for Materials Bioeconomy, FinnCERES).

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