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

  • 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.

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Metadaten
Author:Tom Pavlitschek, Markus Gretz, Johann Plank
URL:https://doi.org/10.1002/app.37981
Parent Title (English):Journal of Applied Polymer Science
Publisher:Wiley
Document Type:Article (peer reviewed)
Language:English
Publication Year:2013
Tag:Cement; Construction Chemical Additives; Construction Chemistry
Volume:127
Issue:5
Page Number:7
First Page:3705
Last Page:3711
Peer reviewed:Ja
faculties / departments:Fakultät für Holztechnik und Bau