Abstract
Lignosulfonate from sulfite spent liquor was grafted, after purifying through ultrafiltration with acrylic monomers: methyl acrylate, methyl methacrylate and methacrylic acid. Copolymerization was redox initiated by peroxide-ferrous ions in aqueous and non-aqueous media under nitrogen atmosphere. The effects of reaction medium, reaction time, lignin/monomer ratio, pH, and peroxide charge, on the copolymerization were studied. Among the media employed, the magnitude of conversion of acrylate monomer was found to be the highest in water, lower in dioxane, and the lowest in methanol; while for acrylic acid the medium preference of obtaining better conversion was in the order of: water, methanol and dioxane. The best reaction conditions in water were: 3% peroxide, 1:3 lignin/monomer without any buffering, under which conversion would reach 88-96% and the grafting efficiency 35-62%.
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