Presented in part before the Technology Section of the International Symposium on Macromolecules (IUPAC) in Rio de Janeiro, Brazil, July 26–31, 1974.
The xanthate method of grafting. III. Effect of lignin content on the graftability of wood pulp†
Article first published online: 9 MAR 2003
Copyright © 1975 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 19, Issue 6, pages 1573–1584, June 1975
How to Cite
Hornof, V., Kokta, B. V. and Valade, J. L. (1975), The xanthate method of grafting. III. Effect of lignin content on the graftability of wood pulp. J. Appl. Polym. Sci., 19: 1573–1584. doi: 10.1002/app.1975.070190608
- Issue published online: 9 MAR 2003
- Article first published online: 9 MAR 2003
- Manuscript Revised: 8 NOV 1974
- Manuscript Received: 21 AUG 1974
Several commercial wood pulps of different chemical origin and with various lignin content were copolymerized with acrylonitrile using the xanthate grafting process. A number of experiments were carried out to evaluate the effects exerted by the residual lignin and by other wood components on the grafting reaction. The results obtained show that graft copolymers can be prepared in good yields with pulps containing as much as 23% lignin. With the aim to investigate the effect of lignin in more detail, two series of pulps were prepared by delignification of a crude sulfite pulp and a crude Kraft pulp to different levels of lignin content. Sodium chlorite was used as a bleaching agent. Copolymerization results obtained with these pulps indicate some fundamental differences in behavior between sulfite and Kraft pulps. In both cases, the copolymerization is afflicted by a short inhibition period whose duration, however, does not depend on the lignin content in the pulp.