Physical chemical and thermoanalytical characterization of cements based on synthetic hydroxyapatite.
The synthesis and characterization of cements based on hydroxyapatite are reported. The cements were prepared by mixing a solid phase formed by hydroxyapatite (HAP), gypsum, sodium alginate (NaAlg) and N,N-poly-vinil-pirrolidone with a liquid phase containing potassium sulfate and potassium phosphat...
| Publicado en: | Revista CENIC Ciencias Quimicas Vol. 37; no. 2; pp. 63 - 69 |
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| Autores principales: | , , , , |
| Formato: | Artículo |
| Publicado: |
Centro Nacional de Investigaciones Cientificas
2006
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| Sumario: | The synthesis and characterization of cements based on hydroxyapatite are reported. The cements were prepared by mixing a solid phase formed by hydroxyapatite (HAP), gypsum, sodium alginate (NaAlg) and N,N-poly-vinil-pirrolidone with a liquid phase containing potassium sulfate and potassium phosphate. The samples so prepared as well as the major components (hydroxyapatite and gypsum) were characterized by x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric and differential thermal analysis. The cements so prepared, as well as the major components (hydroxyapatite and gypsum) were characterized by different techniques. The results of FTIR and XRD confirm the high purity and cristallinity of the HAP synthesized and used as raw material for the synthesis of the cements. The relative intensities in the FTIR spectra of the bands assigned to PO groups and water change with the composition of the cement. FTIR of cements also indicate a reduction in the cristallinity degree of the HAP during the cement formation, confirmed by XRD results, and the appear of new bands assigned to the vibration mode of carboxylate groups from the polymers used. The thermal behaviour of the cements is also affected by the composition of the cements. Se reporta la síntesis y caracterización de cementos basados en hidroxiapatita. Los cementos fueron preparados mezclando una fase sólida formada por hidroxiapatita, yeso, alginato de sodio y N-polivinil-2-pirrolidona con una fase líquida que contenía sulfato y fosfato de potasio. Los cementos y sus componentes mayoritarios fueron caracterizados por diferentes técnicas. Las intensidades relativas en los espectros FTIR de las bandas asignadas a los grupos PO y al agua, cambian con la composición del cemento. Los espectros infrarrojos de los cementos también indican una reducción del grado de cristalinidad de la hidroxiapatita durante la formación del cemento, confirmada por los resultados de RX y la aparición de nuevas bandas asignadas al modo de vibración de grupos carboxilatos como resultado de los polímeros empleados. El comportamiento térmico de los cementos se ve también alterado por la composición de los cementos. |
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