Polymethacrylimide high temperature resistant foam is a cross-linked rigid structure foam material with a 100% closed cell structure, and its uniform cross-linked cell wall structure can give it outstanding structural stability and excellent The mechanical properties. At present, high temperature resistant foam has been widely used in aerospace, aviation, military industry, shipbuilding, automobile, railway locomotive manufacturing, radar, antenna and other fields.
Performance of high temperature resistant foam: 100% closed cell structure and isotropy; good heat resistance, heat distortion temperature is 180～240℃; excellent mechanical properties, high specific strength, high specific modulus, in various foams Medium is the highest; surface contact, with good compression creep performance; can be formed by high-temperature autoclave, can be vacuum-packaged and heated, and can also be melt-injected to achieve one-time co-solidification of foam interlayer and prepreg; no Containing freon and halogen; good fire resistance, non-toxic, low smoke; good compatibility with various resin systems; excellent dielectric properties: dielectric constant 1.05～1.13, loss tangent at (1～18) ×10-3.
In the frequency range of 2～26 GHz, the change of its dielectric constant and dielectric loss is very small, showing good wide-band stability, making it very suitable for the manufacture of radar and radome. The high temperature resistant foam does not have the wet heat corrosion of the panel-honeycomb interface of the aluminum honeycomb sandwich structure. Among the foams of the same density, the strength and stiffness of the high temperature resistant foam are the highest among all foams. In many cases with high requirements for use conditions, high temperature resistant foam can be used as the core material of advanced composite sandwich structures, such as aerospace, aviation, railway locomotives and ships.
When the high temperature resistant foam is used as the core material, the Scrim method, filament winding method, pressure casting method and other methods can be used to make composite materials. High temperature resistant foam has the advantages of small specific gravity, high temperature resistance, low dielectric constant and loss, high compressive strength, high specific strength, good fatigue and creep resistance, etc. It can be cured with prepreg in one step; at the same time, it is resistant to high temperature Foam has excellent secondary processing properties and can be heated to form products with different curved shapes.