Morphology and rheology of cellulose nanofibrils derived from mixtures of pulp fibres and papermaking fines

Colson, Jérôme; Bauer, Wolfgang; Mayr, Melanie; Fischer, Wilhelm Anton; Gindl‐Altmutter, Wolfgang

doi:10.1007/s10570-016-0987-x

Cited by 29 publications

(22 citation statements)

References 25 publications

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“…3) showed an increase in storage (G 0 ) and loss moduli (G 00 ) between 5 and 10 passes but both the moduli stabilized at certain level between 10 and 15 passes. This confirms the results obtained by Grüneberger et al (2014) and Colson et al (2016) who compared viscosities of mechanically fibrillated samples and found a viscosity plateau after a certain number of mechanical fibrillation steps. Grüneberger et al (2014) reported that the viscosity levelled off after 5-8 passes and Colson et al (2016) reported a levelling off after 10-14 passes.…”

Section: Rheological Propertiessupporting

confidence: 92%

Hydrothermally induced changes in the properties of MFC and characterization of the low molar mass degradation products

et al. 2019

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The aim of this study was to determine hydrothermally induced changes in the physicochemical properties of a fine microfibrillated cellulose (MFC). The MFC was prepared from a monocomponent endoglucanase-treated never-dried birch kraft pulp which had been run several times through a microfluidizer in order to obtain a sample substantially free from fibers or fiber fragments. The fine MFC was subjected to hydrothermal treatment at 150 C for 0.5, 2.5, 4.5, 8.5 and 20.5 h, after which the viscosity, water-retention capacity, surface charge, discoloration and formation of hydrolysis products were determined. The viscosity, surface charge and waterretention capacity of MFC decreased as a result of the treatment but in oscillatory measurements the storage and loss moduli increased. Hydrothermal treatment also caused discoloration of the sample which could not be fully washed away with water. Surface analysis with XPS revealed no significant changes in the surface structure of the dried MFC cakes but the filtrates after the hydrothermal treatment were complex mixtures of sugars, organic acids and furans. The main degradation products detected were xylose and xylobiose, but isomerization products of sugars (xylulose, fructose) were also found in the filtrates. In addition numerous organic acids, including formic, glycolic, lactic and xylonic acid, were identified in the filtrates, showing that both acid and alkaline catalyzed reactions occur due to dissociation of water into H þ and OH À .

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Section: Rheological Propertiessupporting

confidence: 92%

Hydrothermally induced changes in the properties of MFC and characterization of the low molar mass degradation products

et al. 2019

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“…The rheological characteristics of various CMNF suspensions has become a widely discussed topic. Although knowledge on rheological behavior is naturally important in the use of CMNFs as a rheology modifier (Dimic-Misic et al 2013;Shao et al 2015;Li et al 2015) and stabilizer (Andresen and Stenius 2007;Winuprasith and Suphantharika 2013), such information is also needed for CMNF production (Delisée et al 2010;Pääkkönen et al 2016;Colson et al 2016) and for other CMNF-related processes (Saarikoski et al 2015;Shao et al 2015;Hoeng et al 2017;Kumar et al 2017). A recent thorough review of the rheology of CMNF suspensions can be found in (Hubbe et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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

Koponen

2019

Cellulose

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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 $$K \sim c^{2.43}$$K∼c2.43 and $$\tau_{y} \sim c^{2.26}$$τy∼c2.26, respectively, and a decent approximation for flow index is $$n = 0.30 \times c^{ - 0.43}$$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. Graphic abstract

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“…The rheological characteristics of various MNFC suspensions have become a widely discussed topic. Although knowledge of the rheological behavior is naturally important in the use of MNFC as a rheology modifier (Dimic-Misic et al 2013a;Shao et al 2015;Li et al 2015) and stabilizer (Andresen and Stenius 2007;Winuprasith and Suphantharika 2013), such information is also needed for MNFC production (Pääkkönen et al 2016;Delisée et al 2010;Colson et al 2016) and for other MNFC-related processes (Saarikoski et al 2015;Hoeng et al 2017;Shao et al 2015;Kumar et al 2017).…”

Section: Introductionmentioning

confidence: 99%

“…There are many variables that can influence the rheological behavior of MNFC suspensions. These include consistency van de Ven 2014, 2015;Charani et al 2013), size distribution and morphology (Colson et al 2016;Zhang et al 2012;Saarikoski et al 2012;Agoda-Tandjawa et al 2010;Dimic-Misic et al 2013b;Gourlay et al 2018), composition (Pääkkönen et al 2016), modifications to the cellulose surface (Samyn and Taheri 2016;Lasseuguette et al 2008), ionic strength (Lowys et al 2001;Saarikoski et al 2012), and effects of various polymers (Karppinen et al 2011;Agoda-Tandjawa et al 2012;Naderi and Lindström 2014). Recent reviews on MNFC rheology can be found in Colson et al (2016), Nechyporchuk et al (2016) and Hubbe et al (2017).…”

Section: Introductionmentioning

confidence: 99%

Pipe rheology of microfibrillated cellulose suspensions

Turpeinen

Jäsberg

Haavisto³

et al. 2019

Cellulose

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The shear rheology of two mechanically manufactured microfibrillated cellulose (MFC) suspensions was studied in a consistency range of 0.2-2.0% with a pipe rheometer combined with ultrasound velocity profiling. The MFC suspensions behaved at all consistencies as shear thinning power law fluids. Despite their significantly different particle size, the viscous behavior of the suspensions was quantitatively similar. For both suspensions, the dependence of yield stress and the consistency index on consistency was a power law with an exponent of 2.4, similar to some pulp suspensions. The dependence of flow index on consistency was also a power law, with an exponent of -0.36. The slip flow was very strong for both MFCs and contributed up to 95% to the flow rate. When wall shear stress exceeded two times the yield stress, slip flow caused drag reduction with consistencies higher than 0.8%. When inspecting the slip velocities of both suspensions as a function of wall shear stress scaled with the yield stress, a good data collapse was obtained. The observed similarities in the shear rheology of both the MFC suspensions and the similar behavior of some pulp fiber suspensions suggests that the shear rheology of MFC suspensions might be more universal than has previously been realized.

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Morphology and rheology of cellulose nanofibrils derived from mixtures of pulp fibres and papermaking fines

Cited by 29 publications

References 25 publications

Hydrothermally induced changes in the properties of MFC and characterization of the low molar mass degradation products

Hydrothermally induced changes in the properties of MFC and characterization of the low molar mass degradation products

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

Pipe rheology of microfibrillated cellulose suspensions

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