Optimizing the preparation conditions of amphoteric polyacrylamide as a strength additive for recycled paper
Source abstract
Abstract
Abstract Acrylamide, itaconic acid and methacryloyloxyethyl trimethylammonium chloride were used to synthesize a series of amphoteric polyacrylamides (AmPAM) by aqueous solution polymerization through varying the pH, the reaction time, the temperature and the composition. The polymers were characterized by molecular weight and added in a recycled pulp furnish to make sheets. Paper strength was highest with the polymer made at pH 7 and 70 °C for 6 h with a monomer ratio of 2:0.3:0.3 (AM:IA:DMC) with 0.6 % initiator (based on the total mass of monomers). The optimized polymer was characterized by thermal gravity analysis, Fourier transform infrared spectroscopy and was then added at various pH and dosage level to the pulp alone or in combination with PAC, to determine the optimum addition conditions. Strength increased significantly with AmPAM addition level and PAC dosage but pH had little effect. The treated fibers were characterized by Zeta potential and drainage measurements. SEM showed the presence of a polymer film that is believed to reinforce inter-fiber bonds in the paper.
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Research context
OpenAlex topics: Advanced Cellulose Research Studies · Surface Modification and Superhydrophobicity · Electrowetting and Microfluidic Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
College of Material Science and Technology , Beijing Forestry University , Beijing 100083 , China
Funding
National Natural Science Foundation of China · State Forestry Administration
References (24)
Show source-provided references
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