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Tailoring fibre and paper properties using physical adsorption of polyelectrolytes
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.
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: urn:nbn:se:kth:diva-106222ISBN: 978-91-7501-557-6 (print)OAI: oai:DiVA.org:kth-106222DiVA: diva2:573326
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
List of papers
1. The use of polymeric amines to enhance the mechanical properties of lignocellulosic fibrous networks
Open this publication in new window or tab >>The use of polymeric amines to enhance the mechanical properties of lignocellulosic fibrous networks
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.

Keyword
Polyelectrolyte adsorption, Polyallylamine, Polyvinylamine, Dry strength, Unbleached chemical fibres
National Category
Textile, Rubber and Polymeric Materials
Identifiers
urn:nbn:se:kth:diva-98915 (URN)10.1007/s10570-012-9712-6 (DOI)000305236900034 ()2-s2.0-84862250391 (Scopus ID)
Note

QC 20150716

Available from: 2012-07-12 Created: 2012-07-05 Last updated: 2017-12-07Bibliographically approved
2. Towards a super-strainable paper using the Layer-by-Layer technique
Open this publication in new window or tab >>Towards a super-strainable paper using the Layer-by-Layer technique
2014 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 100, 218-224 p.Article in journal (Refereed) Published
Abstract [en]

The Layer-by-Layer technique was used to build a polyelectrolyte multilayer on the surface of pulp fibres. The treated fibres were then used to prepare paper sheets and the mechanical properties of these sheets were evaluated as a function of the number of bi-layers on the fibres. Two different systems were studied: polyethyleneimine (PEI)/nanofibrillated cellulose (NFC), and polyallylamine hydrochloride (PAH)/hyaluronic acid (HA). Model experiments using dual polarization interferometry and SiO2 surfaces showed that the two systems gave different thicknesses for a given number of layers. The outer layer was found to be a key parameter in the PEI/NFC system, whereas it was less important in the PAH/HA system. The mechanical properties of the sheets made from the PAH/HA treated fibres were significantly greater than those made from untreated fibres, reaching 70 Nm/g in tensile index and 6.5% in strain at break. Such a modification could be very useful for 3D forming of paper, opening new perspectives in for example the packaging industry, with a renewable and biodegradable product as a potential substitute for some of the traditional oil-based plastics.

Keyword
Layer-by-Layer, Polyelectrolyte multilayer, Hyaluronic acid, Strain at break, Tensile index
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-106574 (URN)10.1016/j.carbpol.2013.03.049 (DOI)000330092000028 ()2-s2.0-84887482182 (Scopus ID)
Note

QC 20140213. Updated from submitted to published.

Available from: 2012-12-04 Created: 2012-12-04 Last updated: 2017-12-07Bibliographically approved
3. Control of wet adhesion between Layer-by-Layer covered surfaces by tailoring the structure and composition of the layers
Open this publication in new window or tab >>Control of wet adhesion between Layer-by-Layer covered surfaces by tailoring the structure and composition of the layers
Show others...
(English)Article in journal (Other academic) Submitted
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-102482 (URN)
Note

QS 2012

Available from: 2012-09-18 Created: 2012-09-18 Last updated: 2012-12-04Bibliographically approved

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