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 {sup o}C was synthesized in aqueous media via emulsion polymerization. Its film forming property was at a temperature of 40 {sup o}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 Ca{sup 2+} ions onto the surface of the anionic latex particles and to interfacial secondary phases. This layer of adsorbed Ca{sup 2+} ions hinders interdiffusion of the macromolecules and subsequent film formation of the latex polymer.
- OSTI ID:
- 21490053
- Journal Information:
- Cement and Concrete Research, Vol. 41, Issue 2; Other Information: DOI: 10.1016/j.cemconres.2010.11.005; PII: S0008-8846(10)00248-6; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0008-8846
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACRYLATES
ADSORPTION
CALCIUM IONS
CEMENTS
COALESCENCE
DEFORMATION
EMULSIONS
FILMS
LATEX
LAYERS
POLYMERIZATION
SCANNING ELECTRON MICROSCOPY
STOWING
STYRENE
SURFACES
TEMPERATURE RANGE 0273-0400 K
TIME DEPENDENCE
WATER
ALKYLATED AROMATICS
AROMATICS
BUILDING MATERIALS
CARBOXYLIC ACID SALTS
CHARGED PARTICLES
CHEMICAL REACTIONS
COLLOIDS
DISPERSIONS
ELASTOMERS
ELECTRON MICROSCOPY
HYDROCARBONS
HYDROGEN COMPOUNDS
IONS
MATERIALS
MICROSCOPY
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
POLYMERS
RUBBERS
SORPTION
TEMPERATURE RANGE