English Translation : Structure-Control of Amphoteric Polyacrylamide and Its Performance as Dry Strength Resin

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  • Structure-Control of Amphoteric Polyacrylamide and Its Performance as Dry Strength Resin

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Dry strength resin is known as multifunctional chemicals to enhance paper⁄paperboard strength, drainage and retention. Especially, polyacrylamide (PAM) based dry strength resin is widely used in various paper⁄paperboard grades in Japan. Linear, Low-branched, and high-branched PAM containing both anionic and cationic groups were obtained with free radical polymerization. Molecular weight and structure of PAM were determined by gel permeation chromatography coupled on line to a multi-angle laser light scattering detector (GPC-MALS). The higher degree of branching, the more compact a polymer chain, which leads to decrease in the viscosity of aqueous solution.<BR>The effects of structure and molecular weight of amphoteric PAM on the performance of dry strength resin were investigated. The high-branched PAM with higher molecular weight showed greater performance in retention of PAM and paper strength. The zeta-potential of amphoteric PAM increased with the increasing of the degree of branching. The high-branched amphoteric PAM was able to form polyionic complexes in high salt concentration (electro conductivity, 650 mS⁄m). The effective iconicity of amphoteric PAM could be controlled by changing the structure of polymer.

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  • 紙パ技協誌

    紙パ技協誌 67 (5), 544-549, 2013

    紙パルプ技術協会

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