PERSONAL DE APOYO
FASCIO Mirta Liliana
Structured Elastomeric Submillimeter Films Displaying Magneto and Piezo Resistivity
MARIANO M. RUIZ; CLAUDIA M. MARCHI; OSCAR E. PEREZ; GUILLERMO E. JORGE; MIRTA L. FASCIO; NORMA B. D´ACCORSO; R. MARTÍN NEGRI
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
JOHN WILEY & SONS INC
Lugar: New York; Año: 2015 vol. 53 p. 574 - 586
Structured elastomer films (100-150 µm) presenting piezo and magneto resistance are described. The films are composites of filler particles, which are both electrically conductive and magnetic, dispersed in an elastomeric matrix. The particles consist of magnetite (6 nm) grouped in silver-coated aggregates (Fe3O4@Ag). The matrix is styrene-butadiene rubber (SBR) in which diethylene glycol (DEG) is added. The particles, SBR and DEG, are dispersed in toluene and then placed between two rare earth magnets. Formation of pseudo-chains (needles) of inorganic material aligned in the direction of the magnetic field is obtained after solvent evaporation. The addition of DEG is substantial to obtain an electrically conductive material. The electrical conductivity is anisotropic and increases when applying normal stresses and/or magnetic fields in the direction of the needles. The elastomers, particles, and needless were characterized by XRD, SEM, EDS, FTIR, DSC, TGA, VSM, profilometry, and stress-strain analysis.