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Influence of polymer charge, temperature and surfactants on surface sizing of liner and greaseproof with hydrophobically modified starch
Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.ORCID iD: 0000-0002-1256-1708
2009 (English)In: TAPPI Journal, ISSN 0734-1415, no February, 33-38 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2009. no February, 33-38 p.
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-2099OAI: oai:DiVA.org:kau-2099DiVA: diva2:6448
Available from: 2007-03-15 Created: 2007-03-15 Last updated: 2015-10-22Bibliographically approved
In thesis
1. Properties of modified starches and their use in the surface treatment of paper
Open this publication in new window or tab >>Properties of modified starches and their use in the surface treatment of paper
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The papermaking industry uses a large amount of starch each year, both as a wet-end additive and as a rheological modifier in surface sizing and coating colors. It is important to be able to reduce the amount of chemicals used in the papermaking and surface treatment process, to reduce costs and to make the process even more efficient. Interest in new high-performance starches is great. By using these new types of starches, improved recycling of barrier products may be obtained as well as a reduction in the use of synthetic sizing agents. The objectives of this work were to understand the behavior of temperature-responsive hydrophobically modified starches, where the solubility in water simply can be adjusted by temperature or by polymer charge, to improve the barrier properties, like the water vapor permeability, mechanical properties and water resistance (Cobb and contact angle) of papers surface sized by starch-containing solutions, and to investigate the potential for industrial use of these temperature-responsive starches. It was demonstrated that the temperature-responsive starches phase separate upon cooling and, depending on the charge density of the starch, a particulate precipitation or a gel-like structure was obtained. The starch with zero net charge showed a larger increase in turbidity than the starch with a cationic net charge, indicating that particulate precipitation is favored by a zero net charge and that the formation of a gel network is favored by charged starch molecules. Further, the starches formed inclusion complexes with surfactants, giving stabilization to the starches in the presence of surfactants. The net charge density of the starch and the charge of the surfactant determined whether or not an inclusion complex would form between them. Important mechanisms for the stability of the starch seemed to be formation of mixed micellar-like structures between the hydrophobic chain of the starch and the surfactant along the starch backbone in addition to formation of inclusion complexes between the starch and the surfactant. The hydrophobically modified starches showed higher hydrophobic surface character when applied to the paper surface above the critical phase separation temperature than with application at room temperature. Free films of the temperature-responsive starches showed good barrier against oxygen, but no barrier against water vapor. The mechanical properties decreased with addition of glycerol to the films.

Place, publisher, year, edition, pages
Fakulteten för teknik- och naturvetenskap, 2006
Series
Karlstad University Studies, ISSN 1403-8099 ; 2006:42
Keyword
Surface treatment of paper, hydrophobically modified starches, temperature-responsive starch, inclusion complexes, barrier properties
National Category
Manufacturing, Surface and Joining Technology
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-735 (URN)91-7063-073-9 (ISBN)
Public defence
2006-11-03, Nyqvistsalen, 9C 203, Karlstads universitet, Karlstad, 10:15
Opponent
Supervisors
Available from: 2007-03-15 Created: 2007-03-15

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