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Regular version of the site

Article

Physicomechanical Characteristics of Composite Based on Polyimide Matrix Filled with Tungsten Oxide

Inorganic Materials: Applied Research. 2020. Vol. 11. No. 2. P. 304-311.
Pavlenko V. I., Bondarenko G.G., Cherkashina N. I.

The article presents the possibility of obtaining polymer composite materials based on thermoplastic
polyimide and tungsten oxide (WO3) modified with a hydrophobic silicone fluid. Data on surface microscopy,
Vickers microhardness, density, and thermal stability of composites with different tungsten oxide contents
are presented. As a result of modifying tungsten oxide, its surface becomes hydrophobic, and the contact
angle increases from 31° to 101°. The microstructure of the surface of composites has a fine-grained structure
without microcracks and chips. The lowest density material has no filler. With increasing filler content, the
density increases. When the content of the filler is 80 wt %, the density is 4.35 g/cm3. The optimum content
of tungsten oxide filler is 60 wt % as measured by the surface microhardness. The work shows that the introduction
of the proposed filler significantly increases the heat resistance of polyimide. Pure polyimide is stable
up to 425°С, and at a temperature of 680°С, its full thermal decomposition takes place. With increasing content
of modified tungsten oxide in the composite, the rate of mass loss decreases. In the composite containing
60 wt % filler at 680°C, the mass loss is 38%.