Change search
ReferencesLink to record
Permanent link

Direct link
Determination of fibre pore structure: influence of salt, pH and conventional wet strength resins
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0001-8622-0386
2005 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 12, no 3, 253-265 p.Article in journal (Refereed) Published
Abstract [en]

It has been shown, in the present investigation, that the two methods used to investigate the pore size distribution of unbleached chemical pulps, i.e. inverse size exclusion chromatography (ISEC) and nuclear magnetic resonance (NMR), give different average pore radius for the pores inside the fibre wall. This is due to the way in which these experiments are performed and the sensitivity of the methods to different types of pores in the cell wall. It was also shown that the two methods gave different results when changing the pH and the ionic strength of the pulp suspension. The pore radius, as detected with ISEC, decreased with both increasing ionic strength and decreasing pH, indicating a loose structure of the exterior of the fibrillar network. However, the pore radius as detected with NMR, was virtually unaffected when increasing the ionic strength, indicating a very rigid structure of the interior of the fibre wall. Decreasing pH though, lead to a decrease in pore radius indicating that upon protonation of the carboxylic groups in the fibre wall, the electrostatic repulsion is diminished and the average pore radius decreases. The NMR technique was also used to study wet strength aid penetration into the fibre wall. It was shown that wet strength aids with a small molecular weight, penetrated the fibre wall, as detected by a decrease in pore radius. It was also shown that addition of different wet strength aids increased the tensile index of the sheet and decreased the fibre strength, measured as zero span-strength of the sheets.

Place, publisher, year, edition, pages
2005. Vol. 12, no 3, 253-265 p.
Keyword [en]
crosslinking, dry strength agents, fibres, fibre saturation point, pore size distribution, tensile strength, wet strength agents, multifunctional carboxylic-acids, paper strength, cross-linking, pulp fibers, mechanism, relaxation, size
URN: urn:nbn:se:kth:diva-15058DOI: 10.1007/s10570-004-5837-6ISI: 000232058600005ScopusID: 2-s2.0-26644471713OAI: diva2:333099
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Wågberg, Lars
By organisation
Fibre and Polymer Technology
In the same journal
Cellulose (London)

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 52 hits
ReferencesLink to record
Permanent link

Direct link