Ultrasonic depolymerization of aqueous carboxymethylcellulose

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

Research output: Contribution to journalArticleScientificpeer-review

72 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

Fingerprint

depolymerization
Carboxymethylcellulose Sodium
Depolymerization
Ultrasonics
ultrasonics
degradation
Degradation
Molecular mass
mass distribution
Sonication
Hydrodynamics
Viscosity
Industry
Polymers
Molecules
Ultrasonic waves
ultrasonic radiation
Macromolecules
macromolecules
molecules

Keywords

  • carboxymethylcellulose
  • depolymerization
  • ultrasound
  • viscosity

Cite this

Grönroos, Antti ; Pirkonen, Pentti ; Ruppert, Oliver. / Ultrasonic depolymerization of aqueous carboxymethylcellulose. In: Ultrasonics Sonochemistry. 2004 ; Vol. 11, No. 1. pp. 9 - 12.
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Ultrasonic depolymerization of aqueous carboxymethylcellulose. / Grönroos, Antti (Corresponding Author); Pirkonen, Pentti; Ruppert, Oliver.

In: Ultrasonics Sonochemistry, Vol. 11, No. 1, 2004, p. 9 - 12.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Ultrasonic depolymerization of aqueous carboxymethylcellulose

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AU - Pirkonen, Pentti

AU - Ruppert, Oliver

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AB - 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.

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