Polyesters based on oxygen-organosolv lignin

Oxygen-organosolv lignin (namely oxygen-acetone) was introduced as a macromonomer into polyesterification systems including diacid chlorides and, optionally, oligoethyleneoxide glycols. It was concluded that the incomplete participation of phenolic hydroxy groups of lignin in these polycondensation reactions could lead to poor crosslinking as shown by the partial solubility of the final polyesters in polar solvents. This paper presents the synthesis, characterization and some properties of these materials.