At MSU created a material with high specific strength, can replace aluminum and titanium in the aerospace industry
Experts of chemical faculty of Moscow state University managed to create a unique polymer matrix on the basis of new phthalonitrile monomers for polymer composite materials. As stated, these materials have higher specific strength compared to metals, which can significantly reduce the weight of parts designed for operation at high temperatures. Development can find application in the aerospace industry, replacing the aluminum and titanium in the construction of aircraft and spacecraft.
Structural polymer composite materials (PCM) consists of a polymeric binder matrix and the reinforcing element (filler), between which there is a clear boundary. For example, in ugleplastika reinforcing filler is carbon fabric, binder is polyester or epoxy resin, bismaleimide, polyimides and many other polymers.
Such materials are widely used in modern aircraft. So, the Boeing 787 Dreamliner is composite by 50%, and fighter Eurofighter at 70%. Metals can replace the PCM in the engine parts such as compressor blades, low pressure, and in the panels of supersonic aircraft, but such PCM needs to withstand high temperatures.
Chemists from Moscow state University have proposed a new approach to the molecular design of bis-phthalonitrile monomers forming a polymeric matrix. The result was obtained material, which is lighter in comparison with the known analogues, to obtain heat-resistant parts with complex shapes with a minimum number of connecting elements. New PCM is suitable for use at temperatures up to 450 °C. For comparison: now application temperature range is not more than RMB 150 °C for the most common materials and up to 250 °C — for heat-resistant.
Verify that the value of the RMB by about an order higher than the cost of titanium or aluminum alloys. However, this factor kompensiruet lower cost of fabrication and maintenance of large parts of complex shape. Furthermore, the use of CFRP allows to increase the degree of integrity of structures by reducing the number of parts, thereby reduces the cost of Assembly. The strength of CFRP is higher than that of aluminum, 6-8 times, and the specific gravity is below 1.5, which gives a gain during the operational phase due to the increase in payload. It remains to add that the details of the composite are not subject to corrosion.