Ultrasonic depolymerization of aqueous carboxymethylcellulose

Antti Grönroos (Corresponding Author), Pentti Pirkonen, Oliver Ruppert

    Research output: Contribution to journalArticleScientificpeer-review

    81 Citations (Scopus)

    Abstract

    Prolonged exposure of solutions of macromolecules to high-energy ultrasonic waves produces a permanent reduction in viscosity. However, the exact mechanism by which degradation occurs is still open to discussion. According to this study hydrodynamic forces played the primary role in degradation process. This study showed that there is an optimal carboxymethylcellulose (CMC) concentration to the most efficient degradation. Ultrasound degraded preferentially large CMC molecules and cleavage took place roughly at the centre of the CMC molecules. Degradation of CMC did not proceed below a certain molecular mass. During ultrasonic degradation the molecular mass distribution narrowed. For any polymer degradation process to become acceptable to industry, it is important to be able to specify the sonication conditions to produce a particular relative molecular mass distribution.

    Original languageEnglish
    Pages (from-to)9 - 12
    Number of pages4
    JournalUltrasonics Sonochemistry
    Volume11
    Issue number1
    DOIs
    Publication statusPublished - 2004
    MoE publication typeA1 Journal article-refereed
    Event3rd Conference on Applications of Power Ultrasound in Physical and Chemical Processing - Paris, France
    Duration: 13 Dec 200114 Dec 2001

    Keywords

    • carboxymethylcellulose
    • depolymerization
    • ultrasound
    • viscosity

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