Mechanoradical formation and its effects on birch kraft pulp during the preparation of nanofibrillated cellulose with Masuko refining

I. Solala (Corresponding Author), A. Volperts, A. Andersone, T. Dizhhite, N. Moronova-Ulmane, A. Vehniäinen, Jaakko Pere, T. Vuorinen

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    47 Citations (Scopus)

    Abstract

    Masuko refining of unbleached kraft birch pulp has been noted to result in more thorough fibrillation than the refining of its bleached counterpart. This result is observed through different fractionation behavior of once refined pulps and is further supported by different relative changes in pulp viscosity. The formation of mechanoradicals during refining is observed with electron paramagnetic resonance spectroscopy, and the role of lignin and hemicelluloses [quantified using kappa number determination and UV resonance Raman (UVRR) spectroscopy] in the progress of refining is discussed. Lignin, a known antioxidant, is capable of stabilizing radicals, which could potentially counteract recombination reactions between highly reactive cellulose radicals. On the other hand, lignin’s ability to promote fibrillation could also lie in its amorphous nature and not solely in its antioxidant characteristics. Furthermore, bleaching removes not only lignin but also hemicelluloses, which affects both the charge density and the structure of the fiber material, and this is another likely contributor to the easier fibrillation of lignin-containing pulps.
    Original languageEnglish
    Pages (from-to)477-483
    Number of pages7
    JournalHolzforschung
    Volume66
    Issue number4
    DOIs
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed

    Keywords

    • electron paramagnetic resonance
    • free radicals
    • hexenuronic acid
    • lignin
    • Masuko refining
    • mechanoradicals
    • nanofibrillated cellulose
    • UV resonance Raman spectroscopy

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  • Cite this

    Solala, I., Volperts, A., Andersone, A., Dizhhite, T., Moronova-Ulmane, N., Vehniäinen, A., Pere, J., & Vuorinen, T. (2012). Mechanoradical formation and its effects on birch kraft pulp during the preparation of nanofibrillated cellulose with Masuko refining. Holzforschung, 66(4), 477-483. https://doi.org/10.1515/hf.2011.183