Abstract
Samples of spruce dioxane lignin were isolated by means of six-stage extraction from spruce sawdust, their macromolecular characteristics were determined, and the hydrodynamic properties of the fractions were studied. The conformational properties and the topological structure of dioxane lignin were characterized. The heterogeneity of spruce dioxane lignin isolated in the successive steps of organosolv delignification was established, a property that is confirmed by the variability of the Tsvetkov-Klenin hydrodynamic invariant and a departure from linearity of the logarithmic dependence of the diffusion coefficient on the molecular mass. It was assumed that dioxane lignin macromolecules exist as branched polymers at Mw 2 × 104.
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