Effects of an External Magnetic Field on Polymeric Foam-Ferromagnet Composites


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Composite lightweight materials based on a polymeric matrix with embedded magnetic micro-particles have been developed. The application of a magnetic field (MF) during the foaming of samples induced the alignment of magnetic particles along the MF lines, forming reinforcing chain-like structures. The presence of aligned micro-particles imparted an anisotropic mechanical behavior along the particle alignment direction, thus strongly improving mechanical stiffness and strength compared to randomly filled systems. The application of a MF on pre-strained samples during the magneto-mechanical characterization resulted in a direct relationship between the measured variation of the elastic modulus of the foam and the time dependent intensity of the applied MF (also for a magnetic field strength as low as 200 kA/m). In particular, all reinforced samples pre-strained in the linear elastic region of the stress-strain curve exhibited a magneto-strictive response (negative variation of the measured stress). On the contrary, a positive variation of the measured stress (strengthening effect) was detected in samples with aligned particles at pre-strains above the yield point. This behavior has been related to the tendency of chain-like aggregates in buckled cell edges to re-align along the MF lines.



Edited by:

Pietro Vincenzini




M. D'Auria et al., "Effects of an External Magnetic Field on Polymeric Foam-Ferromagnet Composites", Advances in Science and Technology, Vol. 97, pp. 30-35, 2017

Online since:

October 2016




* - Corresponding Author

[1] E. Galipeau, P. Ponte Castañeda, The effect of particle shape and distribution on the macroscopic behavior of magnetoelastic composites, Int. J. Solids Struct. 49 (2012) 1-17.

[2] X. Guan, X. Dong, J. Ou, Magnetostrictive effect of magnetorheological elastomer, J. Magn. Magn. Mater. 320 (2008) 158-163.

[3] S. Bednarek, The Giant Volumetric Magnetostriction of Ferromagnetic Composites With Elastomer Matrix, Mod. Phys. Lett. B 13 (1999) 865-878.

DOI: https://doi.org/10.1142/s0217984999001068

[4] L. Sorrentino, M. Aurilia, G. Forte, S. Iannace, Composite Polymeric Foams Produced by Using Magnetic Field, Adv. Sci. Technol. 54 (2008) 123-126.

DOI: https://doi.org/10.4028/www.scientific.net/ast.54.123

[5] L. Sorrentino, M. Aurilia, G. Forte, S. Iannace, Anisotropic mechanical behavior of magnetically oriented iron particle reinforced foams, J. Appl. Polym. Sci. 119 (2011) 1239-1247.

DOI: https://doi.org/10.1002/app.32603

[6] D. Davino, P. Mei, L. Sorrentino, C. Visone, Polymeric Composite Foams With Properties Controlled by the Magnetic Field, IEEE Trans. Magn. 48 (2012) 3043-3046.

DOI: https://doi.org/10.1109/tmag.2012.2198634

[7] Q. Gong, J. Wu, X. Gong, Y. Fan, H. Xia, Smart polyurethane foam with magnetic field controlled modulus and anisotropic compression property, RSC Adv. 3 (2013) 3241-3248.

DOI: https://doi.org/10.1039/c2ra22824f

[8] M. D'Auria, D. Davino, R. Pantani, L. Sorrentino, Polymeric Foam-Ferromagnet Composites as Smart Lightweight Materials, Smart Mater. Struct 25 (2016) 055014.

DOI: https://doi.org/10.1088/0964-1726/25/5/055014

[9] Z. Varga, G. Filipcsei, M. Zrínyi, Magnetic field sensitive functional elastomers with tuneable elastic modulus, Polymer 47 (2006) 227-233.

DOI: https://doi.org/10.1016/j.polymer.2005.10.139

[10] D. Ivaneyko, V. Toshchevikov, D. Borin, M. Saphiannikova, G. Heinrich, Mechanical Properties of Magneto-Sensitive Elastomers in a Homogeneous Magnetic Field: Theory and Experiment, Macromol. Symp. 338 (2014) 96–107.

DOI: https://doi.org/10.1002/masy.201450401

[11] L. J. Gibson, M. F. Ashby, Cellular solids: structure and properties, Cambridge University Press, (1997).