Film Formation of a Non-Ionic Ethylene-Vinyl Acetate Latex Dispersion in Cement Pore Solution

Abstract:

Environmental scanning electron microscopy (ESEM) and complementary methods were employed to study the time dependent film formation of a non-ionic latex dispersion in water @ pH 12.8 and cement pore solution. A commercial liquid ethylene-vinyl acetate latex dispersion stabilized with PVOH possessing a minimum film forming temperature (MFFT) of 3 °C and a Tg of 19 °C was employed in the study. Prior to ESEM imaging the latex dispersion was stored at room temperature and then transferred into the ESEM instrument for imaging. Subsequently, micrographs monitoring its film forming behaviour are obtained. The analysis revealed that upon removal of water, film formation occurs as a result of particle packing, particle deformation and finally particle coalescence. In synthetic cement pore solution film formation occurs faster than in water and is complete within one day. This acceleration can be ascribed to the presence of PVOH on the surface of the latex particles. In water at neutral pH, PVOH forms a shell around the latex particle and hinders the interdiffusion of the macromolecules while in cement pore solution, PVOH precipitates due to high pH and high concentration of cations. This way the latex particles can coalesce faster into a polymer film.

• Periodical: Advanced Materials Research (Volume 687)
• Pages: 316-321
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.687.316
• Online since: April 2013
• Authors: Thomas Pavlitschek, Yu Jin, Johann Plank
• Keywords: Cement Pore Solution, ESEM, EVA Latex, Film Formation

References

[1] Czarnecki, L., Concrete-polymer composites, Trends shaping the future, Int. J. Soc. Mater. Eng. Resour. 15, 2007, 1-5.

DOI: 10.5188/ijsmer.15.1

[2] Ohama, Y., Handbook of polymer-modified concrete and mortars-properties and process technology, 1. Auflage, Noyes Publications, Park Ridge, 1995.

[3] Steward, P. A., Hearn, J., Wilkinson, M. C., An overview of polymer latex film formation and properties, Advances in Colloid and Interface Science. 86 (2000) 195-267.

DOI: 10.1016/s0001-8686(99)00037-8

[4] Barluenga, G., Hernández-Olivares, F., SBR latex modified mortar rheology and mechanical behaviour, Cement and Concrete Research. 34 (2004) 527-535.

DOI: 10.1016/j.cemconres.2003.09.006

[5] Mansur, A. A. P., Nascimento, O. L. d., Mansur, H. S., Physico-chemical characterization of EVA-modified mortar and porcelain tiles interfaces, Cement and Concrete Research. 39 (2009) 1199-1208.

DOI: 10.1016/j.cemconres.2009.07.020

[6] Ohama, Y., Principle of latex modification and some typical properties of latex-modified mortars and concretes, J. Aci. Mater. 84(1987) 511-518.

DOI: 10.14359/2463

[7] Pascal, S., Alliche, A., Pilvin, P., Mechanical behaviour of polymer modified mortars, Materials Science and Engineering A. 380 (2004) 1-8.

DOI: 10.1016/j.msea.2004.03.049

[8] Wang, R., Wang, P.-M., Li, X.-G., Physical and mechanical properties of styrene–butadiene rubber emulsion modified cement mortars, Cement and Concrete Research. 35 (2005) 900-906.

DOI: 10.1016/j.cemconres.2004.07.012

[9] Afridi, M. U. K., Ohama, Y., Demura, K., Iqbal, M. Z., Development of polymer films by the coalescence of polymer particles in powdered and aqueous polymer-modified mortars, Cement and Concrete Research. 33 (2003) 1715-1721.

DOI: 10.1016/s0008-8846(02)01094-3

[10] van-Gemert, D., Czarnecki, L., Maultzsch, M., Schorn, H., Beeldens, A., Lukowski, P., Knapen, W.: Cement concrete and concrete–polymer composites: Two merging worlds: A report from 11th ICPIC Congress in Berlin, 2004 Cem. Concr. Comp. 27 (2005) 926-933.

DOI: 10.1016/j.cemconcomp.2005.05.004

[11] Keddie, J. L., Film formation of latex, Mat. Sci. Eng. Reports. 21(1997) 101-170.

[12] Gretz, M., Plank, J., An ESEM investigation of latex film formation in cement pore solution, Cement and Concrete Research. 2 (2011) 184-190.

DOI: 10.1016/j.cemconres.2010.11.005

[13] Rechenberg, W., Sprung, S., Composition of the solution in the hydration of cement, Cem. Concr. Res. 13(1983) 119-126.

[14] Greene, B. W., Nelson, A. R., Keskey, W. H., Redispersible styrene/butadiene latexes. 1. Preparation and properties, The Journal of Physical Chemistry. 84 (1980) 1615-1620.

DOI: 10.1021/j100449a036

[15] Jenni, A., Herwegh, M., Zurbriggen, R., Holzer, L., Polymerverfilmung in zementären Systemen, GDCh Monographie Bd. 24 (2001) 92-97.