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On the Adhesive Properties of Polyelectrolyte Multilayers
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
(English)Licentiate thesis, comprehensive summary (Other scientific)
Identifiers
URN: urn:nbn:se:kth:diva-9462ISBN: 978-91-7415-138-1 (print)OAI: oai:DiVA.org:kth-9462DiVA: diva2:114070
Presentation
2008-10-31, STFI-Salen, Drottning Kristinas väg 61, KTH, Stockholm, 10:00 (English)
Supervisors
Available from: 2008-11-07 Created: 2008-11-05 Last updated: 2010-08-23
List of papers
1. Adhesive Interaction between Polyelectrolyte Multilayers of Polyallylamine Hydrochloride and Polyacrylic Acid Studied Using Atomic Force Microscopy and Surface Force Apparatus
Open this publication in new window or tab >>Adhesive Interaction between Polyelectrolyte Multilayers of Polyallylamine Hydrochloride and Polyacrylic Acid Studied Using Atomic Force Microscopy and Surface Force Apparatus
2009 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 25, no 5, 2887-2894 p.Article in journal (Refereed) Published
Abstract [en]

In the present work, the adhesion between substrates treated with identical polyelectrolyte multilayers (PEM) from polyallylamine hydrochloride (PAR) and poly(acrylic acid) (PAA) was studied using atomic force microscopy (AFM) and the Surface force apparatus (SFA). The AFM measurements, conducted under wet conditions for PEMs formed at pH 7.5, showed a higher adhesion (pull-off force) when PAH was adsorbed in the outermost layers. There was also a difference depending on the Molecular mass of the polymers, demonstrating a greater adhesion for the low molecular mass combination of polyelectrolytes. Furthermore, die time in contact showed to be of importance, with increasing pull-off forces with contact time at maximum load. The SFA measurements were conducted under dry conditions, at 100% RH, and under wet conditions for PEMs adsorbed at pH 7.5/3.5. The SFA adhesion measurements showed that under dry conditions, the adhesive forces between two high energetic mica substrates were lowered when they were covered by PEMs before the measurements. The thickness of the adsorbed layers was also measured using SFA. This showed that there was a significant swelling when the dry layers were exposed to 100% RH or to wet conditions. The swelling was higher, indicating a less rigid layer, when PAH was adsorbed in the outermost layer than when the PEM was capped with PAA.

Keyword
Adhesion measurements; Adhesive forces; Adhesive interactions; Adsorbed layers; AFM; Atomic forces; Atomic-force microscopies; Contact time; Dry conditions; Low molecular mass; Maximum loads; Mica substrates; Polyacrylic acids; Polyallylamine hydrochlorides; Polyelectrolyte multilayers; Pull-off forces; Surface force apparatus; Wet conditions
National Category
Paper, Pulp and Fiber Technology Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-9460 (URN)10.1021/la803628w (DOI)000263770800054 ()2-s2.0-65249127948 (Scopus ID)
Note

QC 20100823. Uppdaterad från manuskript till artikel (20100823). Tidigare titel: The Adhesive Interaction between Polyelectrolyte Multilayers of Polyallylamine Hydrochloride and Polyacrylic Acid studied using Atomic Force Microscopy (AFM) and Surface Force Apparatus (SFA)

Available from: 2008-11-05 Created: 2008-11-05 Last updated: 2016-05-16Bibliographically approved
2. Adsorption Behavior and Adhesive Properties of Biopolyelectrolyte Multilayers formed from Cationic and Anionic Starch
Open this publication in new window or tab >>Adsorption Behavior and Adhesive Properties of Biopolyelectrolyte Multilayers formed from Cationic and Anionic Starch
2009 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 10, no 7, 1768-1776 p.Article in journal (Refereed) Published
Abstract [en]

Cationic starch (D.S. 0.065) and anionic starch (D.S. 0.037) were used to form biopolyelectrolyte multilayers. The influence of the solution concentration of NaCl on the adsorption of starch onto silicon oxide substrates and on the formation of multilayers was investigated using stagnation point adsorption reflectometry (SPAR) and quartz crystal microbalance with dissipation (QCM-D). The wet adhesive properties of the starch multilayers were examined by measuring pull-off forces with the AFM colloidal probe technique. It was shown that polyelectrolyte multilayers (PEM) can be successfully constructed from cationic starch and anionic starch at electrolyte concentrations of 1 mM NaCl and 10 mM NaCl. The water content of the PEMs was approximately 80% at both electrolyte concentrations. However, the thickness of the PEMs formed at 10 mM NaCl was approximately twice the thickness formed at I mM NaCl. The viscoelastic properties of the starch PEMs, modeled as Voigt elements, were dependent on the polyelectrolyte that was adsorbed in the outermost layer. The PEMs appeared to be more rigid when capped by anionic starch than when capped by cationic starch. The wet adhesive pull-off forces increased with layer number and were also dependent oil the polyelectrolyte adsorbed in the outermost layer. Thus, starch PEM treatment has a large potential for increasing the adhesive interaction between solid substrates to levels higher than can be reached by a single layer of cationic starch.

Keyword
Adhesive interaction; Adhesive properties; Adsorption behavior; AFM; Anionic starch; Cationic starches; Colloidal probe techniques; Electrolyte concentration; Layer number; Polyelectrolyte multilayer; Pull-off forces; Quartz crystal microbalance with dissipation; Silicon oxide substrates; Single layer; Solid substrates; Solution concentration; Stagnation point adsorption reflectometry; Viscoelastic properties; Voigt elements; Wet adhesives
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-9461 (URN)10.1021/bm900191s (DOI)000268139300013 ()2-s2.0-67650497882 (Scopus ID)
Note
QC 20100826. Uppdaterad från manuskript till artikel (20100826)Available from: 2008-11-05 Created: 2008-11-05 Last updated: 2011-09-23Bibliographically approved

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