Thermal Processes in Mixtures of Iron with Polymers and Low-Molecular-Weight Organic Compounds after Plastic Deformation
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ICOCHEMICAL PROCESSES AT THE INTERFACES
Thermal Processes in Mixtures of Iron with Polymers and Low-Molecular-Weight Organic Compounds after Plastic Deformation under High Pressure V. A. Zhorina, *, M. R. Kiselevb, and V. A. Kotenevb aSemenov
Institute of Chemical Physics, Russian Academy of Sciences, Moscow, 119991 Russia Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, 119991 Russia *e-mail: [email protected]
b
Received October 25, 2019; revised January 6, 2020; accepted January 13, 2020
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. DOI: 10.1134/S2070205120040280
INTRODUCTION Polymer-matrix composite materials with organic and inorganic fillers are widely used in various fields of science and technology [1, 2]. In addition to extensive application as structural materials, such composites are also used as functional nanomaterials and nanolayers. The use of active metal nanoparticles as an inorganic subsystem of a metal–polymer composite is presently of particular interest, since it allows one to prepare composite materials with pronounced properties of active metal and metal–oxide nanoparticles [2], in combination with controlled protective and/or activating properties of a polymer matrix contacting with nanoparticles [2]. Various organic compounds and polymer binders are widely used as matrices, their industrial range made it possible to use them for various technological applications and in human activities due to environmental safety and operational characteristics [3–5]. The introduction of fillers for various purposes to composite materials with the participation of various polymer binders enabled one to provide the required performance characteristics (strength, hardness, and modulus of elasticity) and solve applied problems of corrosion resistance, wear resistance, etc. [3–6]. Durability, as well as thermal and mechanical stability of the resulting composite material, is an import-
ant characteristic in the selection of metal fillers and polymer matrix. When exposed to atmospheric factors, it depends on the stress state at the polymer– metal interfa
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