Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Vibrational sum frequency spectroscopy on polyelectrolyte multilayers: modelling of hydrophobic fibres
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.ORCID iD: 0000-0002-7410-0333
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0001-8622-0386
Show others and affiliations
(English)Manuscript (preprint) (Other academic)
National Category
Materials Chemistry Paper, Pulp and Fiber Technology Nano Technology
Identifiers
URN: urn:nbn:se:kth:diva-91385OAI: oai:DiVA.org:kth-91385DiVA: diva2:509792
Note

QC 20160620

Available from: 2012-03-14 Created: 2012-03-14 Last updated: 2016-06-20Bibliographically approved
In thesis
1. Tailoring adhesion and wetting properties of cellulose fibers and model surfaces
Open this publication in new window or tab >>Tailoring adhesion and wetting properties of cellulose fibers and model surfaces
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The layer-by-layer (LbL) technique was used to modify the surface of cellulose fibers by consecutive adsorption of poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) followed by a final adsorbed layer of anionic paraffin wax colloids. Paper hand sheets made from the modified fibers were found to be highly hydrophobic with a contact angle of 150°. In addition to the significantly increased hydrophobicity, the sheets showed improved mechanical properties, such as a higher tensile strength. Heat treatment of the prepared sheets further enhanced both the mechanical properties and the hydrophobicity. These results demonstrate the flexibility and robustness of the LbL technique, which allows us to combine the known adhesive effect of PAH/PAA LbL films with the functionality of wax nanoparticles, creating a stronger and highly hydrophobic paper.

It was further observed that LbL modified sheets without wax also displayed increased hydrophobicity when heat treated. The mechanism was studied through model experiments where LbL films of PAH/PAA were assembled on flat non-porous model cellulose surfaces. Contact angle measurements showed the same trend due to heat treatment of the model films, although, the absolute value of the contact angles were smaller. Analysis using the highly interfacial sensitive vibrational sum frequency spectroscopy technique showed an enrichment of CH3 groups (from the polymer chain ends) at the solid/air interface. These results indicate that during the heat treatment, a reorientation of polymer chains occurs to minimize the surface energy of the LbL film.

In the second part of this work, the adhesive interactions between the main constituents of wood fibers were studied using high-resolution measuring techniques and well-defined model films of cellulose, hemicellulose and lignin. Successful surface modification of polydimethylsiloxane (PDMS) caps, needed in the Johnson-Kendall-Roberts (JKR) measuring methodology, by LbL deposition of nanofibrillated cellulose (NFC) and poly(ethylene imine) (PEI) allowed for the first known all-wood biopolymer JKR measurements of the adhesion between cellulose/cellulose, cellulose/lignin and the cellulose/glucomannan surfaces. The work of adhesion on loading and the adhesion hysteresis were similar for all three systems, suggesting that adhesion between the different wood biopolymers does not differ greatly.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. 33 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2012:8
National Category
Materials Chemistry Paper, Pulp and Fiber Technology Nano Technology
Identifiers
urn:nbn:se:kth:diva-91296 (URN)978-91-7501-268-1 (ISBN)
Presentation
2012-03-19, K1, KTH, Teknikringen 56, Stockholm, 14:00 (English)
Opponent
Supervisors
Note

QC 20120314

Available from: 2012-03-14 Created: 2012-03-12 Last updated: 2014-10-03Bibliographically approved

Open Access in DiVA

No full text

Authority records BETA

Larsson, Per A.Wågberg, Lars

Search in DiVA

By author/editor
Gustafsson, EmilLarsson, Per A.Wågberg, Lars
By organisation
Fibre TechnologyWallenberg Wood Science Center
Materials ChemistryPaper, Pulp and Fiber TechnologyNano Technology

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 89 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf