Effect of Ca²⁺ Ions on the Film Formation of an Anionic Styrene/n-Butylacrylate Latexpolymer in Cement Pore Solution

Abstract:

Several methods were employed to study the time dependent film formation of a self synthesized anionic 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 and a glass transition temperature (T_g) of 30 °C was synthesized via emulsion polymerization. Next, its film forming behaviour was studied at 40 °C, using an ESEM instrument. 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 hindered in synthetic 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.

• Periodical: Advanced Materials Research (Volume 687)
• Pages: 322-328
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.687.322
• Online since: April 2013
• Authors: Thomas Pavlitschek, Markus Gretz, Johann Plank
• Keywords: Calcium Ion, Cement Pore Solution, Film Formation, Latex Polymer

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