INVESTIGADORES
CYRAS Viviana Paola
artículos
Título:
Superparamagnetic Nanocomposites Obtained by Dispersion of Ultrafine Magnetic Iron Oxide Nanoparticles in Poly(3-hydroxybutyrate).
Autor/es:
DAVID A. D'AMICO; LAURA FASCE; CRISTINA HOPPE; M. ARTURO LOPEZ-QUINTELA; VIVIANA P. CYRAS
Revista:
EUROPEAN POLYMER JOURNAL
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Eschede; Año: 2014
ISSN:
0014-3057
Resumen:
Superparamagnetic nanocomposites were obtained by dispersion of oleic acidcoatedmagnetic ultrafine iron oxide nanoparticles (NPs) in poly(hydroxybutyrate) (PHB), asemicrystalline, biodegradable and biocompatible polymer. Film nanocomposites displayedan optically homogeneous structure formed by sub-micrometric clusters created by a strongNPs segregation that occurred during solvent evaporation and polymer crystallization.Number and size of clusters increased with the concentration of NPs producing a controlledshift in the blocking temperature but hardly affecting PHB crystallinity and meltingtemperature. The presence of NPs decreased the elastic modulus of PHB and slightlyreduced its hardness, leading to materials with improved resistance to permanent damage.This softening effect was attributed to the oleic acid shell covering the iron oxide core ofthe NPs. The present results shed some light on the mechanisms controlling morphology ofsemicrystalline-based nanocomposites modified with ultrafine NPs, opening interestingpossibilities for the design of materials with controlled functional properties.
