Ultrasonic degradation of aqueous carboxymethylcellulose: Effect of viscosity, molecular mass, and concentration

Antti Grönroos (Corresponding Author), Pentti Pirkonen, Hanna Kyllönen

Research output: Contribution to journalArticleScientificpeer-review

51 Citations (Scopus)

Abstract

It is well established that prolonged exposure of solutions of macromolecules to high-energy ultrasonic waves produces a permanent reduction in viscosity. It is generally agreed as well and also this study proved the hydrodynamic forces to have the primary importance in degradation. According to this study the sonolytic degradation of aqueous carboxymethylcellulose polymer or polymer mixtures is mainly depended on the initial dynamic viscosity of the polymer solution when the dynamic viscosity values are in the area range enabling intense cavitation. The higher was the initial dynamic viscosity the faster was the degradation. When the initial dynamic viscosities of the polymer solutions were similar the sonolytic degradation was dependent on the molecular mass and on the concentration of the polymer. The polymers with high molecular mass or high polymer concentration degraded faster than the polymers having low molecular mass or low polymer concentration. The initial dynamic viscosities were adjusted using polyethyleneglycol.
Original languageEnglish
Pages (from-to)644 - 648
Number of pages5
JournalUltrasonics Sonochemistry
Volume15
Issue number4
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

Keywords

  • ultrasound
  • degradation
  • carboxymethylcellulase
  • cavitation
  • viscosity
  • molecular mass
  • concentration
  • polyethyleneglycol

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