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

    Research output: Contribution to journalArticleScientificpeer-review

    43 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

    Fingerprint

    Kraft pulp
    Lignin
    Cellulose
    Refining
    Pulp
    Antioxidants
    Unbleached pulp
    Fractionation
    Bleaching
    Charge density
    Paramagnetic resonance
    Raman spectroscopy
    Spectroscopy
    Viscosity
    Fibers
    hemicellulose

    Keywords

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

    Cite this

    Solala, I., Volperts, A., Andersone, A., Dizhhite, T., Moronova-Ulmane, N., Vehniäinen, A., ... 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
    Solala, I. ; Volperts, A. ; Andersone, A. ; Dizhhite, T. ; Moronova-Ulmane, N. ; Vehniäinen, A. ; Pere, Jaakko ; Vuorinen, T. / Mechanoradical formation and its effects on birch kraft pulp during the preparation of nanofibrillated cellulose with Masuko refining. In: Holzforschung. 2012 ; Vol. 66, No. 4. pp. 477-483.
    @article{4b0c47cde9094ad28a0b61eb0bd63813,
    title = "Mechanoradical formation and its effects on birch kraft pulp during the preparation of nanofibrillated cellulose with Masuko refining",
    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.",
    keywords = "electron paramagnetic resonance, free radicals, hexenuronic acid, lignin, Masuko refining, mechanoradicals, nanofibrillated cellulose, UV resonance Raman spectroscopy",
    author = "I. Solala and A. Volperts and A. Andersone and T. Dizhhite and N. Moronova-Ulmane and A. Vehni{\"a}inen and Jaakko Pere and T. Vuorinen",
    year = "2012",
    doi = "10.1515/hf.2011.183",
    language = "English",
    volume = "66",
    pages = "477--483",
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    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, vol. 66, no. 4, pp. 477-483. https://doi.org/10.1515/hf.2011.183

    Mechanoradical formation and its effects on birch kraft pulp during the preparation of nanofibrillated cellulose with Masuko refining. / Solala, I. (Corresponding Author); Volperts, A.; Andersone, A.; Dizhhite, T.; Moronova-Ulmane, N.; Vehniäinen, A.; Pere, Jaakko; Vuorinen, T.

    In: Holzforschung, Vol. 66, No. 4, 2012, p. 477-483.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Mechanoradical formation and its effects on birch kraft pulp during the preparation of nanofibrillated cellulose with Masuko refining

    AU - Solala, I.

    AU - Volperts, A.

    AU - Andersone, A.

    AU - Dizhhite, T.

    AU - Moronova-Ulmane, N.

    AU - Vehniäinen, A.

    AU - Pere, Jaakko

    AU - Vuorinen, T.

    PY - 2012

    Y1 - 2012

    N2 - 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.

    AB - 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.

    KW - electron paramagnetic resonance

    KW - free radicals

    KW - hexenuronic acid

    KW - lignin

    KW - Masuko refining

    KW - mechanoradicals

    KW - nanofibrillated cellulose

    KW - UV resonance Raman spectroscopy

    U2 - 10.1515/hf.2011.183

    DO - 10.1515/hf.2011.183

    M3 - Article

    VL - 66

    SP - 477

    EP - 483

    JO - Holzforschung

    JF - Holzforschung

    SN - 0018-3830

    IS - 4

    ER -