The effect of pH on charge, swelling and desorption of the dispersant poly(methacrylic acid) from poly(methyl methacrylate) microcapsules

Markus Andersson Trojer*, Anne Wendel, Krister Holmberg, Magnus Nydén

*Corresponding author for this work

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Poly(methyl methacrylate) microcapsules have been prepared using the solvent evaporation technique with poly(methacrylic acid) (PMAA) as dispersant. The charge, swelling and desorption of PMAA from the microcapsules after treating the suspension with base have been followed using microelectrophoresis, X-ray photoelectron spectroscopy and quartz crystal microbalance with dissipation monitoring on model PMMA surfaces. Basic treatment of the microcapsule suspension leads to temporary colloidal stability through the introduction of charges on the PMAA chain. However, the increase in charge causes a continuous desorption of PMAA from the microcapsule surface, eventually leading to aggregation. If instead poly(diallyldimethylammonium chloride) is added to the base treated microcapsule suspension, good colloidal stability is obtained.

Original languageEnglish
Pages (from-to)213-215
Number of pages3
JournalJournal of Colloid and Interface Science
Volume375
Issue number1
DOIs
Publication statusPublished - 1 Jun 2012
Externally publishedYes

Keywords

  • Quartz crystal microbalance with dissipation monitoring
  • Microcapsule
  • Poly(methacrylic acid)
  • Colloidal stability
  • Degree of dissociation
  • X-ray photoelectron spectroscopy

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