NDLI: Determination of Fibre Pore Structure: Influence of Salt, pH and Conventional Wet Strength Resins

Content Provider	Springer Nature Link
Author	Andreasson, Bo Forsström, Jennie Wågberg, Lars
Copyright Year	2005
Abstract	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.
Starting Page	253
Ending Page	265
Page Count	13
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	12
Issue Number	3
e-ISSN	1572882X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Crosslinking Dry strength agents Fibres Fibre saturation point Pore size distribution Tensile strength Wet strength agents Organic Chemistry Physical Chemistry Polymer Sciences Bioorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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