INVESTIGADORES
MANFREDI Liliana Beatriz
artículos
Título:
Structure-properties relationship in resol/montmorillonite nanocomposites
Autor/es:
L. B. MANFREDI; D.PUGLIA; J.M.KENNY; A. VÁZQUEZ
Revista:
JOURNAL OF APPLIED POLYMER SCIENCE
Editorial:
John Wiley and Sons, Inc
Referencias:
Lugar: Hoboken, NJ, USA; Año: 2007 vol. 104 p. 3082 - 3089
ISSN:
0021-8995
Resumen:
Polymer/layered silicate nanocomposites were prepared, adding modified and non-modified montmorillonites to a resol resin. It was observed that the composites exhibited an intercalated disordered structure by means of X-ray diffraction and transmission electronic microscopy. The crosslinking density of the resol network was greatly influenced by the presence and type of clay that was added to the resin. The composites filled with the modified montmorillonites showed a lower glass transition temperature value as well as a higher degradation peak at approximately 400ºC, which is characteristic of the degradation of methylene bridges, indicating a decrease in the crosslinking density of the resol network when modified clays are added. Resol/unmodified montmorillonite composites exhibited different behaviour comparing to the other composites and the resol. A higher thermal resistance was observed in the fragmentation zone and a different tan d response was seen in the DMA analysis. These differences in the behaviour of the composites could be due to the interaction between the resol prepolymer and the clay modifiers and as a result of their chemical compatibility. The hardness and elastic modulus of the resol were improved with the addition of clays. However, higher values were obtained for the composite made with the more dispersed montmorillonite.