PDF NPPRJ-2012-27-0...pdf | Request a copy Full text restricted Available under University of Tasmania Standard License.

Abstract

Electron paramagnetic resonance (EPR)
was used to study the colloidal structure of model wood
extractive colloids composed of a resin acid (abietic
acid), a fatty acid (oleic acid) and a triglyceride (triolein).
Two nitroxides were chosen as EPR probes to gain a
greater understanding of the different regions of the
colloid in order to assess the current proposed models of
the structure of the wood extractive colloid. A non-polar
nitroxide probed non-polar regions of the colloid, such as
triglycerides, while a surfactant-type nitroxide probed
regions occupied by fatty acids. The effect of varying the
amounts of each of the model colloid components on the
structure of the colloid and its interaction with the probe
was investigated. Results of the EPR study confirm the
existence of a hydrophobic core. However, surface
tension and EPR results suggest that the outer layer of the
colloid is composed of mostly resin acids. It is proposed
that a fatty acid layer exists between the resin acids and
triglycerides and is sufficiently mobile to move between
them. The addition of salt (CaCl2) was found to

Item Type:	Article
Authors/Creators:	Lee, R and Stack, KR and Lewis, T and Garnier, G and Richardson, DE and Ottaviani, MF and Jockusch, S and Turro, NJ
Keywords:	Wood resin, Pitch, Colloid structure, Electron paramagnetic resonance spectroscopy, EPR
Journal or Publication Title:	Nordic Pulp and Paper Research Journal
Additional Information:	Copyright 2012 Svensk Papperstidning
Item Statistics:	View statistics for this item

Actions (login required)

Item Control Page