Publication: Nanocomposites de sílice y polimetilmetacrilato : caracterización por espectroscopía infrarroja por transformada de Fourier
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2009-04
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2009
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Abstract
En este proyecto fin de carrera se aborda un estudio que fundamentalmente se centra en análisis de la estructura y dinámica molecular del polímero utilizado como matriz en materiales nanocompuestos formados por la combinación de nanopartículas de sílice y polimetilmetacrilato (PMMA). En concreto se analiza el efecto tiene la presencia de nanopartículas. Para ello, mediante molienda mecánica de alta energía (HEBM), se prepararon diferentes muestras con distintos porcentajes en peso de nanopartículas de sílice (0%, 2%, 4%, 6%, 10% y 20%), asegurándose así una dispersión homogénea de las partículas. Se utilizó espectroscopia infrarroja por transformada de Fourier (FTIR) para estudiar la estructura y dinámica del PMMA en función de la cantidad de nanopartículas presentes. Para ello se realizaron espectros FTIR en función de la temperatura. Los resultados obtenidos mostraron la existencia de variaciones en la posición de las bandas de absorción infrarroja asociadas al grupo éster del PMMA así como de sus absorbancias relativa tanto en función de la temperatura como de la cantidad de nanopartículas. De esta manera se pudieron obtener temperaturas de transición vítrea del PMMA en los distintos materiales nanocompuestos preparados sin poderse detectar una variación clara en función de la cantidad de nanopartículas. _________________________________________________
The aim of this work is mainly the study of the structure and molecular dynamics of the polymer used as the matrix in the nanocomposite materials formed by the combination of silica nanoparticles and polymethymethacrylate (PMMA). In particular, the effect of the presence of nanoparticles is analyzed. In order to do this, samples with different amounts of nanoparticles (0%, 2%, 4%, 6%, 10% y 20%, weight percentages) were prepared by high energy ball milling (HEBM), ensuring a homogeneous dispersion of the particles within the polymer. Fourier transformed infrared spectroscopy (FTIR) was used to study the structure and dynamics of the PMMA as a function of the amount of nanoparticles. FTIR spectra were obtained as a function of temperature. The results obtained shown: i) the existence of variations in the position of certain infrared absorption bands associated to the ester group of the PMMA and ii) changes in the relative absorbance with both the temperature and the amount of nanoparticles. In this way, glass transition temperatures of the PMMA, Tg, in the nanocomposites could be obtained but, as a function of the amount of nanoparticles, a clear variation in Tg could not be detected.
The aim of this work is mainly the study of the structure and molecular dynamics of the polymer used as the matrix in the nanocomposite materials formed by the combination of silica nanoparticles and polymethymethacrylate (PMMA). In particular, the effect of the presence of nanoparticles is analyzed. In order to do this, samples with different amounts of nanoparticles (0%, 2%, 4%, 6%, 10% y 20%, weight percentages) were prepared by high energy ball milling (HEBM), ensuring a homogeneous dispersion of the particles within the polymer. Fourier transformed infrared spectroscopy (FTIR) was used to study the structure and dynamics of the PMMA as a function of the amount of nanoparticles. FTIR spectra were obtained as a function of temperature. The results obtained shown: i) the existence of variations in the position of certain infrared absorption bands associated to the ester group of the PMMA and ii) changes in the relative absorbance with both the temperature and the amount of nanoparticles. In this way, glass transition temperatures of the PMMA, Tg, in the nanocomposites could be obtained but, as a function of the amount of nanoparticles, a clear variation in Tg could not be detected.
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Materiales compuestos, Polímeros, Espectroscopía infrarroja, Nanopartículas