The effect of residual lignin on the rheological properties of cellulose nanofibril suspensions

Maria C. Iglesias, Niloofar Shivyari, Ann Norris, Raquel Martin-Sampedro, M. E. Eugenio, Panu Lahtinen, Maria L. Auad, Thomas Elder, Zhihua Jiang, Charles E. Frazier, Maria S. Peresin (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Although the removal of lignin and hemicelluloses from cellulose pulp to produce fully bleached cellulose nanofibrils (B-CNF) is the most common practice, the presence of residual lignin and hemicelluloses in raw materials for the production of lignin containing cellulose nanofibrils (LCNFs) holds several advantages. In this work, we investigated the effect of residual lignin in Eucalyptus globulus cellulose fibers on the properties of the resulting LCNFs. The stability of the colloidal suspensions was assessed by zeta-potential values and charge density analyses. Morphology of the CNFs was studied using scanning electron microscopy and atomic force microscopy. Fibril diameter and diameter distributions for CNFs with different levels of residual lignin showed a decrease on fiber diameter as the lignin content increases. Differences in the chemical composition of the CNFs was evidenced as indicated in the Fourier-transform infrared spectroscopy spectra, particularly in fingerprint region. Thermal behavior of the CNFs was not altered by the presence of lignin, as indicated by thermogravimetric analysis. Finally, the rheological behavior of the samples was evaluated observing a gel-like behavior as well as an increase of the viscosity in LCNFs with higher lignin contents.

Original languageEnglish
Pages (from-to)370-381
Number of pages12
JournalJournal of Wood Chemistry and Technology
Volume40
Issue number6
DOIs
Publication statusPublished - 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • cellulosic nanofibers
  • LCNFs
  • Lignin-containing cellulose nanofibrils
  • ligno-nanofibers
  • residual lignin
  • rheology

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