Influence of an external magnetic field on the structure formation and transport properties of polymeric composites based on epoxy and Fe3O4
polymeric composites, magnetic field, thermal conductivity
Abstract
In this paper, the results of the study of the influence of an external magnetic field on the thermal and electrically conductive properties of composites based on epoxy and magnetite are presented. Different types of fillers or amplifiers have been developed to obtain composite materials with desirable thermal, mechanical and electrical properties. Fillers play an important retrofitting role in improving the efficiency of polymers and production efficiency.The samples of the initial epoxy polymer (EP) and composites based on EP and magnetite (Fe3O4) were obtained. To obtain the samples, an epoxidian oligomer (EDO) based on bisphenol A was used, with a density of 1150 kg / m3 at a temperature of 293 K (DER 321 trademark of DOW Chemical). As a curing agent for EDO, Polypox H354 (manufacturer of UPPC (Germany)) was used. As a filler, magnetite (Fe3O4) with a density of 5200 kg/m3 with a conductivity of 10-4÷10-2 S/m and a particle size of 1÷5 μm was selected. Such samples were formed under the action of an external magnetic field and without it. It is found that the formation of a composite under the influence of an external magnetic field leads to the formation of continuous channels from ferromagnetic particles of Fe3O4 in a continuous matrix of EP. It is established that, despite of the high intrinsic electrical conductivity of Fe3O4, the presence of continuous filler channels does not contribute significantly to the resistivity of composites due to high intercontact resistance within the filler channels. The thermal conductivity in the direction of the orientation of the Fe3O4 particles increases substantially. This means that the electrical conductivity of such composites determines the conductivity of the polymer matrix. At the same time, the specific resistance of the composite of the same gross composition in the direction along the direction of the magnetic field of the filler is much lower, but in absolute value remains rather high.
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