Effect of Self-assembly Layering Factors of Cationic Starch on Pulp Zeta Potential

Document Type : Research Paper

Author

Associate Prof., Shahid Beheshti University

Abstract

The layering process has been applied to modify the surface properties of solid materials including cellulosic fibers, in order to increase the amount of additives absorption on the surface of cellulosic fibers. Electrostatic attraction between charged particles and ionized surface of material is the major responsible for this process. Therefore, current research has been conducted to examine the effect of cationic starch degree of substitution (DS), and pH and conductivity of layering medium on zeta potential of recycled fibers. Accordingly, for 8 stage layering, pulp fibers suspension of old corrugated container (OCC) has been successively mixed with solutions of cationic/anionic starch. After each stage, the zeta potential of fibers has been measured. The obtained results showed an increase in zeta potential in fewer assembled layer when low DS of starch was applied. In layering in the pH range of approximately 7.5-10, larger amount of zeta potential has been measured. Additionally, the zeta potential has been increased in low conductivity conditions possibly, due to the more efficient configuration of starch particles around the fibers surface.

Keywords


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