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Memorias de investigación
Artículos en revistas:
Electrically Conductive Composites of Poly(Urea-Formaldehyde) and Cellulose Filled with Aluminum
Año:2012
Áreas de investigación
  • Macromoléculas y polímeros
Datos
Descripción
This article addresses the preparation and characterization of composite materials obtained with compression molding of mixtures of aluminum powder and a commercial grade thermosetting resin of poly(urea-formaldehyde) filled with ?-cellulose in powder form. The homogeneity of these composites was checked by the morphologies of the constituents (filler and matrix) by optical microscopy. The density of the composites was measured and compared with values calculated by assuming different void levels within the samples, to discuss the porosity effect, in connection with optical microscopy observations. Then, the dependence of electrical conductivity of the composites on volume fraction of the metal filler was investigated. The conductivity of the composites is <10?12 S/cm unless the metal content reaches the percolation threshold at a volume fraction of Vc = 38.6 vol%, beyond which the conductivity increases markedly by as much as nine orders of magnitude, indicating an insulator?conductor phase transition. The obtained results on electrical conductivity have been well interpreted with the statistical percolation theory. The deduced critical parameters, such as the threshold of percolation, Vc, the critical exponent, t, and the packing density coefficient, F, were in good accord with earlier studies. In addition, the hardness of samples remained almost constant with the increase of metal concentration.
Internacional
Si
JCR del ISI
Si
Título de la revista
Polymer Composites
ISSN
0272-8397
Factor de impacto JCR
1,231
Información de impacto
Volumen
33
DOI
Número de revista
Desde la página
2188
Hasta la página
2194
Mes
SIN MES
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Participantes
  • Autor: Gabriel Pinto Cañon (UPM)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Polímeros, Caracterización y Aplicaciones
  • Departamento: Ingeniería Química Industrial y del Medio Ambiente
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