Amphoteric polyacrylamide (AmPAM), as an dry strength agent and retention agent, is widely used in wet end of papermaking. Its adsorption behaviors was investigated in detail. The influencing factors, including substates (silica and two cellulose films), polymer properties (MW and concenetrations) and media properties (pH, ionic strength) , were all investigated. The results reveal that type of substrate, media pH, polymer concentration, ionic strength of the solution, had significant effect on the adsorption process, while the parameter of molecular weight played the lest important role in the adsorption. The highest adsorption amont was achieved on the conditons of when the solution pH is close to the isoelectric point of AmPAM, the polymer concentration is high, the ionic strength equals to 100 ppm NaCl solution, and the interface has the highest charge density. The discovery offeres some information to improve adsorption between amphoteric additivies and cellulose fibers. It also shed some light on the mechanism of paper drystrength improvement.

Adsorption of amphoteric polyacrylamide on silica and cellulose surfaces monitored by QCM

251st National Meeting (2016)

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