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Carboxymethylated nanofibrillated cellulose: rheological studies
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Biofibre Materials Centre, BiMaC.
2014 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 21, no 3, 1561-1571 p.Article in journal (Refereed) Published
Abstract [en]

The rheological properties of carboxymethylated nanofibrillated cellulose (NFC), investigated with controlled shear rate- and oscillatory measurements, are reported for the first time. It was shown that the rheological properties of the studied system are similar to those reported for other NFC systems. The carboxymethylated NFC systems showed among other things high elasticity and a shear thinning behaviour when subjected to increasing shear rates. Further, the shear viscosity and storage modulus of the system displayed power-law relations with respect to the dry content of the NFC suspension. The exponential values, 2 and 2.4 respectively, were found to be in good agreement with both theoretical predictions and published experimental work. Furthermore, it was found that the pulp consistency at which NFC is produced affects the properties of the system. The rheological studies imply that there exists a critical pulp concentration below which the efficiency of the delamination process diminishes; the same adverse effect is also observed when the critical concentration is significantly exceeded due to a lower energy input during delamination.

Place, publisher, year, edition, pages
2014. Vol. 21, no 3, 1561-1571 p.
Keyword [en]
Carboxymethylation, Gel, Homogenization, Nanofibrillated cellulose, Rheology, Viscosity
National Category
Polymer Technologies
URN: urn:nbn:se:kth:diva-147413DOI: 10.1007/s10570-014-0192-8ISI: 000336322800042ScopusID: 2-s2.0-84901198035OAI: diva2:731485

QC 20140701

Available from: 2014-07-01 Created: 2014-06-27 Last updated: 2014-07-01Bibliographically approved

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Lindström, Tom
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