An ESEM investigation of latex film formation in cement pore solution

被引：54

作者：

Gretz, M. ^{[1
]}

Plank, J. ^{[1
]}

机构：

[1] Tech Univ Munich, Inst Organ Chem, D-85747 Garching, Germany

来源：

CEMENT AND CONCRETE RESEARCH | 2011年 / 41卷 / 02期

关键词：

Cement; Latex film formation; Polymers; Pore solution; SEM; SCANNING-ELECTRON-MICROSCOPY; PORTLAND-CEMENT; ADMIXTURES; PARTICLES; HYDRATION; WET;

D O I：

10.1016/j.cemconres.2010.11.005

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

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 degrees C was synthesized in aqueous media via emulsion polymerization. Its film forming property was at a temperature of 40 degrees 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. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：184 / 190

页数：7

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