Abstract
Four novel polycarboxylate superplasticizers (PCEs) with different hydrophobic groups incorporating acrylic acid (AA) and polyether (PEO) macromonomers (C4-M-1, C5-M-2, C6-M-3, and C11-M-4) as repeating unit were synthesized by the free radical polymerization. Characterization of the molecular structures of the PCEs by Gel permeation chromatography (GPC), Nuclear Magnetic Resonance (1H NMR), Fourier-transform infrared (FT-IR), and Thermogravimetric analyses (TGA) were performed. After meticulous studying on the impact of the different hydrophobic groups of polycarboxylate superplasticizers on dispersion, adsorption, and flow retaining behaviors of cement mortar, it was found that the longer length of hydrophobic chains of PCEs should be more effective in dispersion maintaining abilities of cement mortars in spite of their weaker initial water-reducing abilities. The difference of the performance in adsorption and zeta potential was attributed to configuration variation of PCEs when the polymers were adsorbed on the cement particles. POLYM. COMPOS., 38:1783–1791, 2017. © 2015 Society of Plastics Engineers
Published Version
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