Microcapsules prepared from a polycondensate-based cement dispersant via layer-by-layer self-assembly on melamine-formaldehyde core templates

Thomas Pavlitschek, Markus Gretz, Johann Plank

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Novel microcapsules were prepared from colloidal core-shell particles by acid dissolution of the organic core. Weakly crosslinked, monodisperse and spherical melamine-formaldehyde polycondensate particles (diameter ∼ 1 μm) were synthesized as core template and coated with multilayers of an anionic polyelectrolyte via layer-by-layer deposition technique. As polyelectrolytes, an anionic naphthalenesulfonate formaldehyde polycondensate that is a common concrete superplasticizer and thus industrially available, and cationic poly(allylamine hydrochloride) were used. Core removal was achieved by soaking the core-shell particles in aqueous hydrochloric acid at pH 1.6, resulting in hollow microcapsules consisting of the polyelectrolytes. Characterization of the template, the core-shell particles, and the microcapsules plus tracking of the layer-by-layer polyelectrolyte deposition was performed by means of zeta potential measurement and scanning electron microscopy. The microcapsules might be useful as microcontainers for cement additives.

Original languageEnglish
Pages (from-to)3705-3711
Number of pages7
JournalJournal of Applied Polymer Science
Volume127
Issue number5
DOIs
StatePublished - 5 Mar 2013
Externally publishedYes

Keywords

  • layer-by-layer
  • melamine-formaldehyde polycondensate particles
  • microcapsules
  • self-assembly
  • superplasticizer

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