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Improving cellulose reactivity by addition of nonionic surfactants
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Akzo Nobel Surface Chemistry AB, Stenungsund, Sweden.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
(English)Manuscript (preprint) (Other (popular science, discussion, etc.))
Identifiers
URN: urn:nbn:se:umu:diva-2447OAI: oai:DiVA.org:umu-2447DiVA: diva2:140475
Available from: 2002-12-19 Created: 2002-12-19 Last updated: 2013-03-19Bibliographically approved
In thesis
1. Nonionic surfactants: A multivariate study
Open this publication in new window or tab >>Nonionic surfactants: A multivariate study
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis technical nonionic surfactants are studied using multivariate techniques. The surfactants studied were alkyl ethoxylates (AEOs) and alkyl polyglucosides (APGs).

The aquatic toxicity of the surfactants towards two organisms, a shrimp and a rotifer, was examined. The specified effect was lethality, LC50, as indicated by immobilisation. In a comparative study, the LC50 values obtained were used to develop two different types of model. In the log P model the toxicity was correlated to log P alone, while in the multivariate model several physicochemical variables, including log P, were correlated to the toxicity. The multivariate model gave smaller prediction errors than the log P model.

Further, the change in reactivity when a surfactant mixture was added to dissolving pulp under alkaline conditions was studied, using the amount of residual cellulose as a measure of the reactivity. Ten AEO/APG mixtures were tested, and the mixture with greatest potential was studied in more detail. An optimum in the amount of added surfactant was found that seems to coincide, according to surface tension measurements, with the CMC.

Place, publisher, year, edition, pages
Umrå: Umeå University, Department of Chemistry, Organic Chemistry, 2002. 51 p.
Keyword
AEO, APG, aquatic toxicity, cellulose reactivity, Fock, MLR, multivariate data analysis, nonionic surfactant, PCA, physicochemical properties, PLS, QSAR, surface activity, viscose
National Category
Other Basic Medicine
Identifiers
urn:nbn:se:umu:diva-12 (URN)91-7305-330-9 (ISBN)
Public defence
2002-11-16, KBC-huset, sal KB3B1, Umeå universitet, Umeå, 10:30 (English)
Opponent
Supervisors
Available from: 2002-12-19 Created: 2002-12-19 Last updated: 2010-03-11Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • vancouver
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Language
  • de-DE
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Output format
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