Abstract
In this study, a series of HPEG PCE polymers with different anionic charge density and side chain lengths was synthesized via free-radical copolymerization from acrylic acid and α-methallyl poly (ethylene glycol) ether (HPEG) as macromonomer. The resulting PCE polymers were characterized via Size Exclusion Chromatography (SEC) and anionic charge titration. Thereafter, a correlation between their molecular structures and dispersing effectiveness was established for alkali-activated slag. A broad variety of HPEG PCE polymers was found to work in the alkali-activated slag (AAS) system. Finally, the working mechanism for best performing polymer was investigated via adsorption measurements. It was concluded that HPEG PCEs of high anionicity, high Mw and short side chain length adsorb particularity high amounts on slag, thus providing enhanced dispersion capacity as compared to other HPEG polymers.
Published Version
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