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Thermal Processes in Mixtures of Iron with Polymers and Low-Molecular-Weight Organic Compounds after Plastic Deformation under High Pressure

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Abstract

The passivating properties of various polymer matrices have been studied for a metal-polymer composite prepared by intensive plastic deformation of “iron powder–polymer” mixtures, as well as the processes of their thermal decomposition in the presence of a filler (active iron particles) and processes of subsequent iron depassivation and oxidation. For this purpose, the initial mixtures of iron with 10 wt % of various components underwent plastic deformation under pressures of 1.5 and 2.5 GPA on Bridgman anvils and then were investigated by the thermogravimetric method in the temperature range of 20–800°C in the air medium. Upon heating the deformed mixtures in a calorimeter in the T-range of 30–400°C, a weight loss associated with the decomposition of organic compounds has been recorded, whereas in the T-range 400–800°C—it was a weight gain associated with iron oxidation. The weight changes in both T-ranges were accompanied by exothermic effects.

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Notes

  1. Highly elastic properties of a polymer material can neutralize the stress state when introducing a metal filler. Stress compensation in metal–polymer systems can also be performed using elastic sublayers, which reduce the significant difference in thermal expansion coefficients between them. Water-soluble organosiloxanes can be used as such sublayers in iron–latex polymer compositions, which have also proved to be metal corrosion inhibitors [6, 7].

  2. Indeed, it was previously shown in [9] that the rate of weight gain of the initial undeformed iron powder appeared to be higher than that of the deformed one (pressed on the Bridgman anvil) (especially in the high-temperature region). It was demonstrated that a significant slowdown in the oxidation process in IPD-deformed samples was associated with the compaction of powdered iron, resulting in an increase in diffusion restrictions and a reduction in the surface of iron powder particles available to oxygen.

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Authors and Affiliations

  1. Semenov Institute of Chemical Physics, Russian Academy of Sciences, 119991, Moscow, Russia

    V. A. Zhorin

  2. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    M. R. Kiselev & V. A. Kotenev

Authors
  1. V. A. Zhorin
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  2. M. R. Kiselev
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  3. V. A. Kotenev
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Correspondence to V. A. Zhorin.

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Translated by D. Marinin

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Zhorin, V.A., Kiselev, M.R. & Kotenev, V.A. Thermal Processes in Mixtures of Iron with Polymers and Low-Molecular-Weight Organic Compounds after Plastic Deformation under High Pressure. Prot Met Phys Chem Surf 56, 705–711 (2020). https://doi.org/10.1134/S2070205120040280

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  • DOI: https://doi.org/10.1134/S2070205120040280

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