Self-condensation of oxidized lignosulfonate. II. Condensation behaviors

Authors

  • Rubie Chen,

    Corresponding author
    1. Université du Québec à Trois-Riviéres, C.P. 500, Trois-Rivieres, Quebec, Canada G9A 5H7
    • Université du Québec à Trois-Riviéres, C.P. 500, Trois-Rivieres, Quebec, Canada G9A 5H7
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  • Guoxiong Wu

    1. Université du Québec à Trois-Riviéres, C.P. 500, Trois-Rivieres, Quebec, Canada G9A 5H7
    2. South China University of Technology, Guangzhou, People's Republic of China
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Abstract

Studies have been made on the principal parameters that affect the self-condensation of oxidized lignosulfonate, such as lignin content, pH, temperature, time of hot pressing, and oxidation. During condensation, the hydroxyl groups in both the lignosulfonate and carbohydrate molecules could react with carboxyl, sulphonic acid, and carbonyl groups to form an ester bond and result in (hemi) ketal and (hemi) acetal structures. These structures made condensation products having excellent resistance in water and in alkaline solutions. The results also demonstrated that the oxidized lignosulfonate could be condensed at a higher rate than could the untreated one.

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