Nanocomposites based on waterborne polyurethane matrix and Fe3O4 nanoparticles: Synthesis and characterization

CINTIA MEIORIN; SELINA L. SCHERZER; VERÓNICA MUCCI; DANIEL G. ACTIS; PEDRO MENDOZA ZELIS; DIRK W. SCHUBERT; MIRNA A. MOSIEWICKI; M. I. ARANGUREN

ADVANCED ENGINEERING MATERIALS (PRINT)

WILEY-V C H VERLAG GMBH

Lugar: Weinheim; Año: 2021

1438-1656

This work shows the feasibility of producing waterborne polyurethanenanocomposites containing magnetic nanoparticles (MNP) by casting method, to obtain filmswith potential magnetic properties. The characterization of the resulting nanocomposites iscarried out using infrared spectroscopy, thermal analysis, colorimetry, tensile tests, microscopyand magnetic tests. The films become opaque and dark colored when MNP is incorporated. Themechanical behavior of the nanocomposites is that of tough plastics, with Young´s modulus inthe range of 106 to 143 MPa, increasing with the MNP concentration. Aggregation of the MNPtakes place at concentrations above 1.5 wt.%, as observed in SEM images of the fracturesurfaces. Magnetization saturation increases with the concentration of MNP. A small coercivityindicates the presence of a fraction of blocked particles whose size exceeds the critical size forsuperparamagnetism at the temperature of the measurements.