AbstractNumber‐average molecular weights and the thermodynamic parameters ΔF̄1, ΔH̄1, and ΔS̄1have been obtained for lignin in the solvents dimethylsulfoxide, dimethyl‐formamide, and dioxane. Widely different molecular weights were found in the different solvents and at the different temperatures as a consequences of molecular association. Analysis of the thermodynamic parameters revealed that these quantities are dominated by the change in solvent structure accompanying the solution process. A correlation between the “goodness” of a lignin solvent and the Hildebrand solubility parameter is consequently misleading in
展开▼
