Nanocomposites with shape memory behavior based on a segmented polyurethane and magnetic nanostructures

SOTO, G.D.; MEIORIN, C.; ACTIS, D.; MENDOZA ZÉLIS, P.; MARCOVICH, NORMA E.; MOSIEWICKI, MIRNA A.

POLYMER TESTING

ELSEVIER SCI LTD

Año: 2018 vol. 65 p. 360 - 368

0142-9418

Shape-memory composites based on a commercial segmented polyurethane and magnetite (Fe3O4) nanoparticles(NPs) were prepared by a simple suspension casting method. The properties of the resulting nanocomposites,containing 1 to 10 nominal wt.% magnetic particles, were evaluated by thermogravimetric tests, contact anglemeasurements, differential scanning calorimetry, infrared and X-ray spectroscopy, static and thermal cyclictensile tests, dynamic mechanical analysis and experiments of alternating-magnetic-field heating. It was foundthat most of the suspended NPs could be successfully incorporated into the polyurethane matrix, and thuscomposite samples with up to 7 wt.% actual concentration were obtained. On the other hand, the incorporationof magnetite nanoparticles to the shape memory polyurethane did not significantly affect most of the matrixproperties, including its shape memory behavior, while added magnetic response to the nanocomposites. Thus,nanocomposites were able to increase their temperature when exposed to an alternating magnetic field, whichallowed them to recover their original shape quickly by an indirect triggering method.