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Polyelectrolyte complexes: their preparation, adsorption behaviour and effect on paper properties
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.
2008 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

In this work, the formation of polyelectrolyte complexes (PECs) has been studied using a jet mixing method not previously used for mixing polyelectrolytes. The PECs were formed from two weak polyelectrolytes, i.e., polyacrylic acid (PAA) and polyallylamine hydrochloride (PAH), with different mixing times, and the results were compared with those for PECs formed using the conventional polyelectrolyte titration method.

 

The adsorption behaviour of the formed PECs on silicon oxide substrates and pulp fibres was analysed, and the results were compared with those for polyelectrolyte multilayers (PEMs) prepared from the same two polyelectrolytes.

 

The results indicated that by using the jet mixer, the size of the formed PECs could be controlled, which was not the case with the polyelectrolyte titration method. The PECs produced by jet mixing were also found to be smaller than those produced by polyelectrolyte titration. From these results, a two-step mechanism for the formation of PECs was suggested: initial precomplex formation, which is a fast and diffusion-controlled process, followed by a reconformation process, during which the vigorous mixing in the jet mixer can partially limit secondary aggregation.

 

When the complexes were adsorbed to silicon oxide or pulp fibre surfaces, adsorption studies indicated that it was impossible to reach the same adsorption levels for PECs as for PEMs. This was explained in terms of free energy, entropical, reasons rather than to any geometric limitation of the surface. Despite the smaller amount of polyelectrolyte adsorbed from the PEC treatment than from the PEM treatment of pulp fibres, the PEC treatment had the greatest effect on paper strength per adsorbed amount of polymer. This was thought to be because the three-dimensional structure of the PECs, versus the smoother structure of PEMs, allows for the formation of multiple contact points between the macroscopically rough fibres and increased molecular contact area.

 

In the adsorption experiments, it was also found that net cationic complexes can adsorb to both anionic and cationic substrates. This phenomenon was explained by the occurrence of anionic patches on the surface of the net cationic PECs and the ability of the PECs, formed from weak polyelectrolytes, to partially change charge upon exposure to a surface of the same charge as the complex itself, due to a change of the degree of dissociation of the polyelectrolytes constituting the complex.

Place, publisher, year, edition, pages
Stockholm: KTH , 2008. , 38 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2008:45
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-4833ISBN: 978-91-7415-015-5 (print)OAI: oai:DiVA.org:kth-4833DiVA: diva2:14185
Presentation
2008-06-13, 10:00
Opponent
Supervisors
Note
QC 20101102Available from: 2008-06-17 Created: 2008-06-17 Last updated: 2010-11-02Bibliographically approved
List of papers
1. A comparison of polyelectrolyte complexes and multilayers: Their adsorption behaviour and use for enhancing tensile strength of paper
Open this publication in new window or tab >>A comparison of polyelectrolyte complexes and multilayers: Their adsorption behaviour and use for enhancing tensile strength of paper
2009 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 24, no 1, 77-86 p.Article in journal (Refereed) Published
Abstract [en]

This paper compares the adsorption behaviour and paper-strength-enhancing properties of polyelectrolyte complexes (PECs) and polyelectrolyte multilayers (PEMs) of polyallylamine hydrochloride and polyacrylic acid. Model adsorption experiments using SPAR (stagnation point adsorption reflectometry) and QCM-D (quartz crystal microbalance with dissipation) showed that the amount of complexes adsorbed was lower than the amount adsorbed when forming a multilayer using the same polymer system. From these experiments, in combination with AFM and ESEM imaging, it was concluded that the PEC adsorption stopped before full surface coverage was reached. Tensile testing of handsheets treated with PECs and PEM showed a significant increase in both tensile index and strain-at-break using both systems. The largest strength improvement was achieved with the fibres treated with the largest number of PEMs, but the largest effect per adsorbed amount of polymer was achieved by PEC treatment.

Keyword
Adsorption, Fibre modification, Jet mixing, Paper strength, Polyelectrolyte complex, Polyelectrolyte multilayer, QCM-D, SPAR
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-8769 (URN)10.3183/NPPRJ-2009-24-01-p077-086 (DOI)000265250200011 ()2-s2.0-65349186024 (Scopus ID)
Note
QC 20100819. Tidigare titel: A comparison between polyelectrolyte complexes and multilayers: their adsorption behaviour and use for enhancing tensile strength properties of paper. Correction in: Nordic Pulp & Paper Research Journal, vol. 24, issue. 2, p. 246Available from: 2008-06-17 Created: 2008-06-17 Last updated: 2017-12-14Bibliographically approved
2. Applying jet mixing to the preparation of polyelectrolyte complexes: complex properties and their interaction with silicon oxide surfaces
Open this publication in new window or tab >>Applying jet mixing to the preparation of polyelectrolyte complexes: complex properties and their interaction with silicon oxide surfaces
(English)Manuscript (Other academic)
Keyword
Adsorption, Jet mixing, Mixing time, Polyelectrolytes, Polyelectrolyte complex
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-8770 (URN)
Note
QC 20101102Available from: 2008-06-17 Created: 2008-06-17 Last updated: 2010-11-02Bibliographically approved

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