The role of pH, ionic strength and monomer concentration on the terpolymerization of 2-acrylamido-2-methylpropane sulfonic acid, acrylamide and acrylic acid. (26th August 2019)

• Record Type: Journal Article
• Authors: Scott, Alison J.; Duever, Thomas A.; Penlidis, Alexander
• Is Part Of: Polymer. Volume 177(2019)
• Page Start: 214
• Page End: 230
• Publication Date: 2019-08-26
• Subjects: Effects on reactivity ratios -- Terpolymerization kinetics -- Water-soluble polymers; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2019.06.006
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: The current study examines the effects of important factors (namely, pH, ionic strength and monomer concentration) on the terpolymerization of 2-acrylamido-2-methylpropane sulfonic acid (AMPS), acrylamide (AAm) and acrylic acid (AAc). A good understanding of how these factor levels affect terpolymerization reactivity ratios, and terpolymer composition, microstructure and molecular weight paves the way for the synthesis of custom-made polymers for specific applications. For the range of conditions studied, ionic strength has the greatest influence on reactivity ratios; results indicate that cross-over behavior exists for AMPS-based reactivity ratios. No clear correlation is observed between pH and reactivity ratio estimates (for 5 ≤ pH ≤ 9), but parameter estimation results suggest that the incorporation of acidic comonomers (AMPS and AAc) is affected by pH within this range. Finally, monomer concentration has a dominant impact on molecular weight averages, even when other factors are varied. Graphical abstract: Image 1 Highlights: pH, ionic strength and monomer concentration are all significant factors. Improved understanding of factor level effects can lead to custom-made materials. Reactivity ratios can be used to select conditions leading to desirable properties. Ionic strength has greatest effect over range studied; cross-over behavior observed.