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Polyimide is 4,4 '- diamino-diphenyl ether with TETRACARBOXYLATOBENZENE anhydride reaction first to be able to insoluble high molecular weight polar solvents prepolymer -- polyamic acid, and then under high temperature cyclic dehydration obtained. Insoluble polymer. Ginger powder, fineness <250um, the apparent density of 0.35. High and low temperature resistance, high performance. In -269 to 400 ° C within a high mechanical properties, thermal deformation temperature of 360 ° C (1.82MPa). The use of temperature to 260 ° C -240. Radiation - resistant excellent. A good wear resistance, the ability to most solvents, but the vulnerability of concentrated acid, concentrated alkaline hydrolysis. In the boiling water and steam under long can be destroyed.
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