Employing of some hyperbranched polyesteramides as new polymeric admixtures for cement |
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| Authors: | A. Amin H. H. M. Darweesh A. M. Ramadan S. M. M. Morsi M. M. H. Ayoub |
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| Affiliation: | 1. Polymers and Pigments Department, National Research Center, Dokki, Giza, Egypt;2. Department of Refractories, Ceramics, and Building Materials, National Research, Centre, Dokki, Giza, Egypt;3. Chemistry Department, Faculty of Science, Helwan University, Egypt |
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| Abstract: | Hyperbranched polyesteramides (HBPA1 and HBPA2) were synthesized by the bulk polycondensation of maleic anhydride (MAn) as an A2 monomer with both of diisopropanolamine (DIPA) and diethanolamine (DEA), respectively, as B′B2 monomer. The prepared polymers were analyzed with IR, GPC, 1H NMR, TGA, and DSC. The hyperbranched polyesteramides were applied as polymeric admixtures in two different types of cement, namely ordinary Portland cement (OPC) and Portland limestone cement (PLC). Several parameters were studied to evaluate the action of HBPA1 and HBPA2 polymers as cement admixtures. Adding HBPA1 and HBPA2 decreased the water of consistency and increased the compressive strength with no effect on the chemical composition of the cement phases. The combined water content and bulk density displayed the same trend as compressive strength. The IR spectra of the formed phases for the mixed cement pastes with HBPA1 and HBPA2 illustrated increased intensities of the absorption bands than those of the pristine cement pastes. The SEM photos showed that the incorporation of HBPA1 and HBPA2 in cement phases affected the morphology and microstructure of the formed hydrates. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 |
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| Keywords: | hyperbranched polymers polyesteramides polymeric admixtures ordinary Portland cement limestone Portland cement |
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