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An ESEM investigation of latex film formation in cement pore solution

  • Environmental scanning electron microscopy (ESEM) and complementary methods were employed to study the time dependent film formation of a latex dispersion in water and cement pore solution. First, a model carboxylated styrene/n-butyl acrylate latex dispersion possessing a minimum film forming temperature (MFFT) of 18 °C was synthesized in aqueous media via emulsion polymerization. Its film forming property was at a temperature of 40 °C, studied under an ESEM. The analysis revealed that upon removal of water, film formation occurs as a result of particle packing, particle deformation and finally particle coalescence. Film formation is significantly retarded when the latex dispersion is present in cement pore solution. This effect can be ascribed to adsorption of Ca2+ ions onto the surface of the anionic latex particles and to interfacial secondary phases. This layer of adsorbed Ca2+ ions hinders interdiffusion of the macromolecules and subsequent film formation of the latex polymer.

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Metadaten
Author:Markus Gretz, Johann Plank
URL:https://doi.org/10.1016/j.cemconres.2010.11.005
Parent Title (English):Cement and Concrete Research
Publisher:Elsevier
Document Type:Article (peer reviewed)
Language:English
Publication Year:2011
Tag:Cement; Cement Pore Solution; Construction Chemistry; Latex-Particles
Volume:41
Issue:2
Page Number:7
First Page:184
Last Page:190
Peer reviewed:Ja
faculties / departments:Fakultät für Holztechnik und Bau