Physico-chemical properties of lignin sulfonates.

• Main Author: Gardon, John. L.
• Other Authors: DuPorte, E. (Supervisor)
• Format: Others
• Language: en
• Published: McGill University 1955
• Subjects: Chemistry.
• Online Access: http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=109959

Lignin sulfonates were separated into eight fractions with molecular weights ranging from 3,700 to 58,000 by means of fractional dialysis and ultrafiltration. All fractions have similar ultraviolet absorption spectra. Their methoxyl contents and neutralization equivalent weights increase with increasing molecular weights. All acid groups on the four highest molecular weight fractions are sulfonic. The molecular weights were determined in a new type of osmometer of simple design.