Journal
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Volume 53, Issue 8, Pages 574-586Publisher
WILEY
DOI: 10.1002/polb.23672
Keywords
composites; elastomers; magnetoresistive composites; piezoresistive elastomers; sensors; structured elastomers
Categories
Funding
- CONICET
- UBA [UBACyT 2012-2015, 2002 01101 00098, 2002 201001 00142]
- CONICET [PIP 112-201101-00370CO]
- Ministry of Science, Technology and Innovations (MINCYT-FONCYT, Argentina) [PICT 2011-0377, PICT-2012-0717]
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Structured elastomer films (100-150 mu m) 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. (c) 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 53, 574-586
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