Surface Chemical Composition and Mechanical Properties of Kraft Pulp Investigated by Xps and Pca
Science Direct Working Paper No S1574-0331(04)70880-2
4 Pages Posted: 7 Jun 2017 Last revised: 20 Jan 2018
Date Written: September 2002
The relations between surface chemical composition and mechanical properties for unbleached kraft eucalypt pulp were investigated using XPS and Principal Component Analysis.PCA was first employed to treat a matrix containing surface and pulp chemical composition data. The loading plot versus PC1 and PC2, that explained 92.7 % and 5.6 % of the variation, respectively; showed relation between xylan, uronic acid and carbohydrate surface coverage. Surface coverage of lignin was related with total lignin content. A second matrix containing surface chemical composition and mechanical properties was treated and two principal components explaining 76.4 % and 19.4 % of variation were identified. The loading plot versus PC1 and PC2 showed relations between surface coverage of lignin and tear index. Surface coverage of carbohydrate and extractives were related with elastic modulus, breaking length, tensile and burst strength. Tear index showed no relation with elastic modulus. Lignin surface coverage can probably affect the energy dissipation in the tearing test conditions.
Keywords: Macromolecular Chemistry > Colloid and Surface Chemistry, macrochem/0209001
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