INVESTIGADORES
MANFREDI liliana Beatriz
capítulos de libros
Título:
Clay filled rigid Polyurethane foams
Autor/es:
P.M. STEFANI; L. ESPÓSITO; L. B. MANFREDI; A. VÁZQUEZ
Libro:
Polymer and Biopolymer Analysis and Characterization
Editorial:
Nova Science Publishers, Inc
Referencias:
Lugar: New York, USA; Año: 2007; p. 127 - 137
Resumen:
Rigid polyurethane foam were prepared from a commercial system using clay as filler
(0, 5, 10 and 20 wt.%). The effect of foaming process on the dispersion of clay in the
polymeric matrix and their consequences on the physical properties of the final foams
were investigated. X-ray diffraction data indicate the intercalation of polymer chains
inside the interlayer spacing of clay. The highest spacing layer was observed in the
sample modified with 5wt% of clay. Transmission electron microscopy photographs
showed that the clay layers were dispersed heterogeneously in the polymeric matrix.
Regions with some agglomerates, intercalation of the polymeric chain in the clay
galleries and small amount of the exfoliated clay sheet were observed. Also the analysis
by TMA showed the alignment of silicate layers as a result of biaxial flow during the
foaming process. A universal testing machine was used to investigate the compressive
properties of the filled foam. The modulus and compressive strength showed a
maximum for a clay content of 5 wt.%. However, the thermal stability did not change
with the clay content.