Interactions Among Components in the Primary Cell Wall of Norway Spruce (Picea Abies): How They are Affected by Different Chemimechanical Treatments, 2007 International Mechanical Pulping Conference

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Dynamic Fourier Transform Infra-Red (FT IR) spectroscopy was used to examine the effect of a low sulphonation on the ultra structure of primary cell wall of spruce wood. Sheets made from enriched primary cell wall material coming from a low sulphonated thermomechanical pulp, were used for studying the viscoelastic response of the polymers. The overall ultra structure of the primary cell wall remained principally unaltered, due to the exceptionally low degree of sulphonation used. An increase in the softening of the material as well as a potential weakening of interactions of the lignin; pectin, lignin; protein and pectin; protein bonds were observed. Results showed a structural modification of lignin caused by selective sulphonation of the primary cell wall.