Magnetism and Structure of Nanocomposites Made From Magnetite and Vegetable Oil Based Polymeric Matrices

C. MEIORIN; O. MOSCOSO LONDOÑO; D. MURACA; L. M. SOCOLOVSKY; K. R. PIROTA; M. I. ARANGUREN; M. KNOBEL; M. A. MOSIEWICKI

MATERIALS CHEMISTRY AND PHYSICS

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2016 vol. 175 p. 81 - 91

0254-0584

The aim of this work is to study the influence of the polymericmatrix composition on particle aggregation, magnetic interparticleinteractions and nanoparticle surface effects, which affect the magneticand structural properties of different ultra-diluted magnetitenanocomposites (MNCPs). Bio-based matrices were selected as a possibleresponse to the increasing demand for renewable materials. To investigatethe influence of different bio-based polymeric matrices on the magneticbehavior, three different bio-based polymers were used to prepare MNCPswith 1 wt.% of magnetite nanoparticles (MNPs). One of them was preparedusing a tung oil (TO)/styrene (St) weight ratio of 70/30, a second onewas prepared by replacing the styrene with methylester (green comonomerobtained from tung oil, ME, 70TO/30ME) and a third one that incorporateda green modifier, acrylated epoxidized soybean oil (AESO), using a tungoil/AESO weight ratio of 90/10. Structural features as nanoparticleaggregation state, nanoparticle and cluster sizes, and fractal dimensionwere studied and determined from small-angle X-ray Scattering (SAXS). Theexperimental SAXS data were analyzed by means of fractal aggregate model.Results indicate differences in nanoparticle arrangement depending of thecontaining matrix. The magnetic characterization of these materialsindicates that the matrix strongly affects the physical and chemicalproperties of the MNCPs. All samples display superparamagnetic behaviorat room temperature, but the blocking temperature varies from 75 K (tungoil/styrene with 1 wt.% MNPs) to 126 K (tung oil/AESO 1 wt.% MNPs).Furthermore, the temperature dependence of the coercive field changes forall samples, suggesting a strong influence of the polymer properties onthe magnetic properties of the MNCPs.