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1 May 1994 Magnetic-field-sensitive polymer composite materials
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Polymer composite material, containing conducting filler particles (e.g., graphite) at concentrations above the percolation threshold should, as a conductor, exhibit certain magnetic-field-sensitive properties, such as Hall effect or magnetoresistance. These effects not only allow us to classify them as smart materials, but also help in establishing the mechanism of conduction in such complex disordered systems. The present paper reports the results of investigations on magnetoresistance in composite materials, prepared by direct polymerization of propylene on graphite particles. The method ensures grafting of polymer to the filler surface, imparting remarkable properties to the composite. For composites with graphite magnetoresistance is positive for filler volume fraction above percolation threshold. Maximum value of magnetoresistance exceeds 10%. Below the threshold the samples show weak negative magnetoresistance, characteristic of conduction through localized states in disordered systems. This result correlates with our model of double percolation over filler particles, surrounded by thin layers of injected charge. New magnetic effects have been found, such as oscillations of dark conductivity in magnetic field and resonance magnetic-spin effects.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Anatoliy T. Ponomarenko, Vitaliy G. Shevchenko, Carl Klason, and Alexander I. Pristupa "Magnetic-field-sensitive polymer composite materials", Proc. SPIE 2189, Smart Structures and Materials 1994: Smart Materials, (1 May 1994);

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