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Hyperbranched polymers as a fixing agent for dissolved and colloidal substances on fiber and SIO2 surfaces
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0001-8622-0386
Karadeniz Tech Univ, Fac Forestry, Dept Pulp & Paper Technol.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
2007 (English)In: Industrial & Engineering Chemistry Research, ISSN 0888-5885, E-ISSN 1520-5045, Vol. 46, no 7, 2212-2219 p.Article in journal (Refereed) Published
Abstract [en]

Hyperbranched polymers (polyesteramides) were used as a cationic fixing agent to remove dissolved and colloidal substances (DCS) from the water phase in a fiber suspension. The relative turbidity, electrophoretic mobility, and average diameter of the colloidal particles were determined as a function of polyelectrolyte concentration. The results indicated that maximum removal of DCS was achieved at about zero electrophoretic mobility of the suspension where the negative surface charges of particles were neutralized by the oppositely charged hyperbranched polymer. The amount of hyperbranched polymers needed to maximize DCS fixation on the fibers was higher than the amount of poly-DADMAC (diallyldimethylammonium chloride) needed to reach the same effect. This was found to be due to the lower molecular weight and lower charge density of hyperbranched polymers. The lower molecular mass allowed penetration of these polymers into pores of fibers that resulted in higher polymer consumption before removal of the dissolved and colloidal substances from the fiber suspensions. A lower charge density further resulted in a higher saturation adsorption of the hyperbranched polymer. Experiments with both DCS and model-latex particles showed that the initial increase in relative turbidity was due to the aggregation of particles before fixation to fibers. The results from quartz crystal microbalance with dissipation (QCM-D) experiments showed that the efficiency of hyperbranched polymer and poly-DADMAC was similar even if they had different structure. Therefore, this study highlights the importance of molecular mass and charge density of the polymers as well as the surface structure of polymer layers which in turn gives implications for development of new structures of fixing agents.

Place, publisher, year, edition, pages
2007. Vol. 46, no 7, 2212-2219 p.
Keyword [en]
Colloids; Dissolution; Electrophoretic mobility; Molecular weight; Suspensions (fluids); Turbidity; Cationic fixing agent; Hyperbranched polymers; Polyesteramides; Polymer consumption
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-14145DOI: 10.1021/ie061108bISI: 000245041400043ScopusID: 2-s2.0-34247099335OAI: diva2:330764
QC 20100720Available from: 2010-07-20 Created: 2010-07-20 Last updated: 2010-07-20Bibliographically approved
In thesis
1. Dynamic and Equilibrium Properties of Adsorbed Polyelectrolyte Layers
Open this publication in new window or tab >>Dynamic and Equilibrium Properties of Adsorbed Polyelectrolyte Layers
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2008. 66 p.
Trita-CHE-Report, ISSN 1654-1081 ; 2008:25
adsorption; cellulose; conformation; flocculation; kinetics; model surfaces; polyelectrolytes; pulp fibres; Quartz Crystal Microbalance with Dissipation; silicon oxide; Stagnation Point Adsorption Reflectometry
National Category
Paper, Pulp and Fiber Technology
urn:nbn:se:kth:diva-4697 (URN)978-91-7178-938-9 (ISBN)
Public defence
2008-04-25, STFI-salen, STFI-Packforsk, Drottning Kristinas väg 61, Stockholm, 10:00
QC 20100720Available from: 2008-04-18 Created: 2008-04-18 Last updated: 2010-07-20Bibliographically approved

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Wågberg, LarsEnarsson, Lars-Erik
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