Modification of High-Yield Pulps with Polyethylene Glycols. I. Model Compound and Isolated Lignin Studies
Titel:
Modification of High-Yield Pulps with Polyethylene Glycols. I. Model Compound and Isolated Lignin Studies
Auteur:
Cole, Barbara J. W. Huth, Stacey P. Runnels, Pamela S.
Verschenen in:
Journal of wood chemistry and technology
Paginering:
Jaargang 13 (1993) nr. 1 pagina's 59-72
Jaar:
1993-03-01
Inhoud:
Phenolic hydroxyl groups in three lignin model compounds, guaiacol, acetoguaiacone, and dehydrodiisoeugenol, and in organosolv lignin were blocked by etherification with polyethylene glycol (PEG). Polyethylene glycol modification, even at a low degree of substitution, greatly enhanced the hydrophilicity of the substrate, producing water-soluble substances. When etherified by reaction with PEG-mesylate, the lignin dimer model compound, dehydrodiisoeugenol, was stabilized considerably against light-induced yellowing.