Effect of high-temperature fiberization on the chemical structure of softwood

Petri Widsten, Jaakko E. Laine, Pia Qvintus-Leino, Simo Tuominen

    Research output: Contribution to journalArticleScientificpeer-review

    25 Citations (Scopus)

    Abstract

    Softwoods fiberized at high temperatures (above 170°C) were subjected to bulk and surface chemical analyses. It was found that the frequency of lignin β-O-4 linkages declined while that of phenolic hydroxyl groups increased with an increase in fiberization temperature. The amount of water extractable aromatic compounds increased with increasing temperature of fiberization, which was associated with cleavage of lignin ether linkages. The water extractable material generated was enriched in hemicelluloses and contained aromatic compounds rich in phenolic hydroxyl groups and low in β-O-4 linkages. The amount and hemicellulose content of the water extracts increased with increasing fiberization temperature. Lipophilic extractives covered most of the fiber surfaces while the surface lignin content of extractives-free fibers roughly doubled their bulk lignin content.

    Original languageEnglish
    Pages (from-to)227-245
    Number of pages19
    JournalJournal of Wood Chemistry and Technology
    Volume21
    Issue number3
    DOIs
    Publication statusPublished - 2001
    MoE publication typeNot Eligible

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