Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 477-483 |
| Number of pages | 7 |
| Journal | Holzforschung |
| Volume | 66 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2012 |
| MoE publication type | A1 Journal article-refereed |
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Keywords
- electron paramagnetic resonance
- free radicals
- hexenuronic acid
- lignin
- Masuko refining
- mechanoradicals
- nanofibrillated cellulose
- UV resonance Raman spectroscopy
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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 journal › Article › Scientific › peer-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 -