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The use of polymeric amines to enhance the mechanical properties of lignocellulosic fibrous networks
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center BiMaC Innovation.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0001-8622-0386
2012 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 19, no 4, 1437-1447 p.Article in journal (Refereed) Published
Abstract [en]

Cationic polyelectrolytes (polyallylamine and polyvinylamine with different molecular masses) were adsorbed onto lignocellulosic fibres from unbleached and unbeaten spruce chemical fibres with different kappa numbers to investigate the effects on the mechanical properties of the final paper materials. Adsorption isotherms were first established to determine the maximum quantity of polymer that could be adsorbed onto each type of fibre. Paper sheets were then made with different amounts of added polyelectrolyte, and the structural and mechanical properties of the sheets were investigated, as well as the effect of an extra heating. The use of fibres with different kappa numbers led to different responses in terms of adsorption, and thus to differences in the mechanical properties of the resulting sheets. The tensile strength index was significantly increased (almost 50 % improvement in the best case) as a consequence of this polyelectrolyte adsorption onto the fibres, even at as low an adsorption level as 2 mg/g. The heating of paper sheets for 10 min at 160 A degrees C was also shown to improve the tensile strength index by about 10 % for pulps with high kappa number.

Place, publisher, year, edition, pages
2012. Vol. 19, no 4, 1437-1447 p.
Keyword [en]
Polyelectrolyte adsorption, Polyallylamine, Polyvinylamine, Dry strength, Unbleached chemical fibres
National Category
Textile, Rubber and Polymeric Materials
Identifiers
URN: urn:nbn:se:kth:diva-98915DOI: 10.1007/s10570-012-9712-6ISI: 000305236900034Scopus ID: 2-s2.0-84862250391OAI: oai:DiVA.org:kth-98915DiVA: diva2:540919
Note

QC 20150716

Available from: 2012-07-12 Created: 2012-07-05 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Tailoring fibre and paper properties using physical adsorption of polyelectrolytes
Open this publication in new window or tab >>Tailoring fibre and paper properties using physical adsorption of polyelectrolytes
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The adsorption of polyelectrolytes, both as monolayers and as multilayers, was investigated as an easy and non-expensive way of producing lignocellulosic fibrous materials with enhanced mechanical properties.

In the first part of the work described in this thesis, the adsorption of a polyelectrolyte monolayer onto the surface of unbleached and unbeaten kraft pulp fibres with different kappa numbers was investigated. Adsorption isotherms were obtained in order to determine the amounts of polymer that could be adsorbed by the different pulps. Handsheets were made from the treated fibres and the mechanical properties were studied. The results showed that the use of only 2 mg/g of a polymeric amine such as polyallylamine or polyvinylamine could under certain conditions increase the tensile strength index by up to 50 %.

In a second investigation, the Layer-by-Layer deposition technique was used to build up polyelectrolyte multilayers on the surfaces of bleached kraft pulp fibres. Two systems were studied and the presence of added salt in the systems was also investigated. The results showed that the system composed of polyallylamine hydrochloride and hyaluronic acid provided a dramatic increase in both strength (from 20 Nm/g to 70 Nm/g) and strain at break (from 2.0 % to 6.5 %) with only five deposited bilayers. Such a stretchability could make this material very suitable for 3D-forming of packaging materials.

The behaviour of this polyallylamine/hyaluronic acid system was then studied from a more fundamental point of view in a third study in order to determine the mechanisms on the nano-scale behind the large improvements observed on the macroscopic paper scale. A quartz crystal microbalance equipment was used to study the adsorption onto model surfaces and show the superlinear trend of the build-up. Atomic force microscopy was also used to study the structural changes occurring upon adsorption of each polymeric layer as well as the adhesive properties of the system.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. viii, 37 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2012:62
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-106222 (URN)978-91-7501-557-6 (ISBN)
Presentation
2012-12-07, K1, Teknikringen 56, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20121204

Available from: 2012-12-04 Created: 2012-11-30 Last updated: 2012-12-04Bibliographically approved

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Wågberg, Lars

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