INVESTIGADORES
MANFREDI Liliana Beatriz
congresos y reuniones científicas
Título:
Nanocomposites based on Polyhydroxybutyrate and different organically modified Montmorillonites
Autor/es:
D.A.DAMICO; A. VÁZQUEZ; L.B. MANFREDI; V.P.CYRAS
Lugar:
San Sebastián, España
Reunión:
Conferencia; V International Conference on Science and Technology of Composite Materials - 8° Congreso Nacional de Materiales Compuestos (COMATCOMP 2009); 2009
Resumen:
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Development of polymer/clay
nanocomposites is one of the latest revolutionary steps of the polymer
technology. Preparation of blends or nanocomposites using low percentages of
inorganic fillers is among the routes to improve some of the properties of
biodegradable polymers such as barrier, thermal and oxidative, when compared
with traditional composites. Montmorillonite (MMT) is among the most commonly
used layered silicates because it is environmentally friendly and readily
available in large quantities with relatively low cost. Therefore, the aim of
this work is to improve the properties of biodegradable polymers by the
addition of small amounts of clay. Films were prepared from a polyhydroxybutirate
(PHB) solution by casting. Nanocomposites were similarly obtained by the
addition of different percentages and type of MMT to the polymer.
Crystallinity, thermal degradation and hidrophobicity of films containing 2, 4,
6 and 10 wt% of two MMTs were investigated. From X-Ray diffraction analysis a
different behaviour was observed. The Cloisite® Na+
showed an increment in their interlayer distance, but the galleries of the
Cloisite® 15A contract during the formation of the film. On the
other hand, the thermal resistance of the composites containing the modified
MMT was higher than the ones with Cloisite® Na+ and PHB
film. These results could be related with the different crystallinity and
morphology of the final materials.