Rationalizing the Effect of the MAA/PEGMA Ratio of Comb-Shape Copolymers Synthetized by Aqueous Free-Radical Copolymerization in the Hydration Kinetics of Ordinary Portland Cements
Methacrylic acid-co-poly(ethylene glycol methacrylate) (MAA-co-PEGMA) copolymers (MPEG-type polycarboxylate ether (PCE) superplasticizers) are characterized by a comb-like structure. Although they have been used for years as dispersants in cementitious formulations, their structure–property relation...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Universidad del País Vasco |
| Repositorio: | Addi. Archivo Digital para la Docencia y la Investigación |
| OAI Identifier: | oai:addi.ehu.eus:10810/66930 |
| Acceso en línea: | http://hdl.handle.net/10810/66930 |
| Access Level: | acceso abierto |
| Palabra clave: | free-radical copolymerization microstructure hydration ordinary portland cement polycarboxylate ether |
| Sumario: | Methacrylic acid-co-poly(ethylene glycol methacrylate) (MAA-co-PEGMA) copolymers (MPEG-type polycarboxylate ether (PCE) superplasticizers) are characterized by a comb-like structure. Although they have been used for years as dispersants in cementitious formulations, their structure–property relationship is still not fully understood. In this work, PCEs with uniform composition and different charge-density (N) or different side chain lengths (P) are synthesized by free-radical copolymerization varying the MAA/PEGMA ratios and ethylene oxide units in the PEGMA macromonomers. The effect of these copolymers on the hydration kinetics of an Ordinary Portland Cement (OPC) is analyzed, and it is observed that by increasing the PCE concentration the hydration is delayed. For a given PCE concentration, the delay is longer as the MAA/PEGMA ratio increases or the side chain length of the PEGMA decreases. The hydration delay is proportional to the carboxylate dosage and all PCEs fit in a master curve proving that the microstructure of the PCEs synthesized by free-radical copolymerization can be correlated with the hydration delay of a commercial OPC. |
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