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Magnetic properties and thermal stability of polyvinylidene fluoride—Fe2O3 nanocomposites

Published online by Cambridge University Press:  03 January 2020

Victor Kuncser ,
Dorina Chipara ,
Karen S. Martirosyan ,
Gabriel Alexandru Schinteie ,
Elamin Ibrahim  and
Mircea Chipara Open the ORCID record for Mircea Chipara [Opens in a new window]
Victor Kuncser
Affiliation:
National Institute of Materials Physics, Atomistilor Str. 405 A, Bucharest-Magurele 077125, Romania
Dorina Chipara
Affiliation:
Department of Physics and Astronomy, The University of Texas, Rio Grande Valley, 1201 W. University Drive, Edinburg, Texas 78539
Karen S. Martirosyan
Affiliation:
Department of Physics and Astronomy, The University of Texas, Rio Grande Valley, 1201 W. University Drive, Edinburg, Texas 78539
Gabriel Alexandru Schinteie
Affiliation:
National Institute of Materials Physics, Atomistilor Str. 405 A, Bucharest-Magurele 077125, Romania
Elamin Ibrahim
Affiliation:
Department of Chemistry, The University of Texas, Rio Grande Valley, 1201 W. University Drive, Edinburg, Texas 78539
Mircea Chipara*
Affiliation:
Department of Physics and Astronomy, The University of Texas, Rio Grande Valley, 1201 W. University Drive, Edinburg, Texas 78539
*
a)Address all correspondence to this author. e-mail: mircea.chipara@utrgv.edu
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Abstract

Nanocomposites of polyvinylidene fluoride loaded with various amounts of γ-Fe2O nanoparticles, with an average size ranging between 20 and 40 nm, have been obtained by melt mixing and investigated using various experimental techniques [Superconducting Quantum Interference Device, Mössbauer, and Thermogravimetric Analysis]. Magnetic and Mössbauer measurements confirmed the presence of maghemite and a trace of a paramagnetic iron compound. Magnetic data are consistent with a blocking temperature close to room temperature (RT), showing a decrease in the coercive field as the temperature is increased. A weak exchange bias was noticed in all nanocomposites investigated at all temperatures and tentatively ascribed to surface spin disorder. The temperature dependence of the coercive field obeys the Kneller law. The nanocomposites exhibit superparamagnetic behavior near RT. Most magnetic measurements have been performed below the blocking temperature, revealing thus a complex behavior. The dependence of the mass loss derivative versus temperature, as obtained by thermogravimetric analysis, exhibits a single peak due to the thermal degradation of the polymeric matrix. A weak increase in the thermal stability of the polymeric matrix upon loading with maghemite is reported.

Keywords

magnetic propertiesMössbauer effectpolymer
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 2 , 28 January 2020 , pp. 132 - 140
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Copyright
Copyright © Materials Research Society 2020

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