Strutured elastomeric sub-millimeter films displaying magneto and piezo resistivity

MARIANO M RUIZ; M. CLAUDIA MARCHI; OSCAR E PEREZ; GUILLERMO E JORGE; MIRTA FASCIO; NORMA DACCORSO; RICARDO MARTÍN NEGRI

Journal of Polymer Science Part B: Polymer Physics

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2015

Structured elastomer films (100-150 m) presenting piezo and magneto resistance aredescribed. The films are composites of particles, which are both electrically conductiveand magnetic dispersed in an elastomeric matrix. The particles consist of magnetite (6nm) grouped in silver coated aggregates (Fe3O4@Ag). The matrix is styrene-butadienerubber(SBR) in which diethylene glycol (DEG) is added. The particles, SBR and DEGare dispersed in toluene and placed between two rare earth magnets. Formation ofpseudo-chains (needles) of inorganic material, aligned in the direction of the magneticfield is obtained after solvent evaporation. The addition of DEG is substantial in orderto obtain an electrical conductive material.The electrical conductivity is anisotropic and increases when applying normal stressesand/or magnetic fields in the direction of the needles. The elastomers, particles andneedless were characterized by XRD, SEM, EDS, FTIR, DSC, TGA, VSM,profilometry and stress-strain analysis.