Premium
Solution properties of lignin. Thermodynamic properties and molecular weight determinations
Author(s) -
Brown W.
Publication year - 1967
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1967.070111125
Subject(s) - lignin , formamide , hildebrand solubility parameter , thermodynamics , solubility , solvent , chemistry , dimethyl formamide , organic chemistry , materials science , physics
Abstract Number‐average molecular weights and the thermodynamic parameters Δ F̄ 1 , Δ H̄ 1 , and Δ S̄ 1 have 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 such systems.