INVESTIGADORES
CYRAS Viviana Paola
congresos y reuniones científicas
Título:
Nanocomposites based on Polyhydroxybutyrate and different organically modified Montmorillonites.
Autor/es:
DAVID A. D'AMICO; ANALÍA VÁZQUEZ; LILIANA B. MANFREDI,; VIVIANA P. CYRAS
Lugar:
San Sebastián. España
Reunión:
Congreso; COMAT COMP 2009; 2009
Resumen:
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.