Study on the graft copolymerization of lignosulfonate and acrylic monomers

✍ Scribed by R. Chen; B. V. Kokta; J. L. Valade

• Publisher: John Wiley and Sons
• Year: 1980
• Tongue: English
• Weight: 561 KB
• Volume: 25
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1980.070251008

✦ Synopsis

Abstract

Graftings of acrylonitrile and methyl methacrylate onto lignosulfonate were studied, respectively, with and without the lignosulfonate ozonized. Copolymerization was redox‐initiated by peroxideferrous ions. Monomer conversion and grafting efficiency depended essentially on reaction medium and the maount of peroxide charged. Among the media employed, the magnitude of the medium effect on conversion was found to be in the following order: water, dioxane, and methanol. The conversions in water of acrylonitrile and methyl methacrylate were 55 and 90%, respectively, when using 3% hydrogen peroxide. Beyond this 3 % charge, both the grafting efficiency and the degree of lignosulfonate grafted approached certain limits. Ozonization appeared to be capable of stimulating the active centers in lignin macromolecules, whereon acrylic monomers could be grafted. Better grafting efficiency was obtained with the ozonized lignosulfonate.