Surface characterization of drying acrylic latex dispersions with variable methacrylic acid content using surface dilatational rheology

Benjamin Voogt, Paul Venema, Leonard Sagis, Henk Huinink*, Bart Erich, Jurgen Scheerder, Olaf Adan

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Hypothesis: Drying of latex dispersions often results in particle gradients at the latex-air interface. We expect that, by increasing the carboxylic acid content of latex particles, inter-particle interactions at the interface change. With dilatational rheology one could detect particle-particle interactions in an early stage of the drying process and elucidate the nature of these interactions. Experiments: Acrylic latex dispersions were prepared with different amounts of methacrylic acid (MAA), ranging from 2 to 10 wt% on dry mass. Dilatational rheology studies during drying at different relative humidities RH were performed using profile analysis tensiometry. Visco-elastic properties of latex surfaces were used to identify inter-particle interactions at the surfaces depending on the drying rate and particle composition. Findings: Drying at 85% RH did not show significant changes of the mechanical properties of the latex surfaces. Drying at 65 and 53% RH resulted in a change of the mechanical properties, ultimately showing non-linear visco-elastic behavior. This indicates that capillary and/or Van der Waals forces were operating between particles at the surface. With increasing MAA content the viscous contribution decreased, possibly due to the formation of more gel-like structures at the particle surface due to higher solubility of polymer segments near to the surface.

Original languageEnglish
Pages (from-to)584-591
Number of pages8
JournalJournal of Colloid and Interface Science
Volume556
DOIs
Publication statusPublished - 15 Nov 2019

Keywords

  • Dilatational rheology
  • Drying
  • Interface
  • Latex
  • Methacrylic acid

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