POLYMER-MAGNETITE THERMOSETTING COMPOSITES WITH PROTECTIVE AND ANTIRADAR FUNCTIONS

Aksimentyeva O.I. та Martyniuk G.V. та Horbenko Yu.Yu. та Malynych S.Z. та Filipsonov R.V. (2020) POLYMER-MAGNETITE THERMOSETTING COMPOSITES WITH PROTECTIVE AND ANTIRADAR FUNCTIONS. Проблеми корозії та протикорозійного захисту матеріалів. Спецвипуск журналу “Фізико-хімічна механіка матеріалів” (№13). с. 138-143.

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Анотація

The hybrid polymer-magnetite composites with antiradar and anticorrosive properties based on the thermoreactive epoxy resin filled with magnetite Fe3O4 particles and conductive conjugated polymer have been prepared. Dispersed magnetite Fe3O4 in a form of spherical particles with the diameter near 2 μm capable of not only absorb but also effectively scatter electromagnetic radiation served as magnetic filler for composites. The magnetite particles were stabilized via polystyrene shell that results in the formation of self-assembled molecular aggregates and provides overall stability of the system. Prepared polymer composites were characterized by Xray and EDAX-analysis and by measuring of some physical properties. Variation in the size of Fe3O4 particles and their concentration in the composites has some effect on the elementary cell parameters of magnetite and has a complex effect on the magnetic susceptibility and microhardness of polymer-magnetite composites. It was found that composite containing magnetic microparticles and particles of polyaniline doped with p-toluene sulfonic acid in 1:1 ratio exhibits the strongest microwave absorption. At the same time this optimal composition provides high microhardness and anticorrosive properties of the coating on the surface of steel. The value of the relative water absorption of the composite coatings during 30 days of exposure in a moist chamber with a humidity of 95% turned out to be 5-6 times less as compared to an unfilled epoxy composition. The electrochemical potential of the steel surface coated with the developed thermosetting composition exhibits significant anode shift (by 0.3-0.4 V) at soaking in 3% aqueous NaCl solution, while the surface state of the coatings remained unchanged more than 30 days. The obtained results confirmed the sufficient corrosion resistance of the coatings and will be used for development of composites with special purpose.

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