Polyimide is one of the best overall performance of organic polymer materials, high temperature of 400 ℃ or more,Long-term use temperature range of -200 ~ 300 ℃, no significant melting point, high insulation properties, dielectric constant of 4.0 at 103 Hz, dielectric loss is only 0.004 to 0.007, F belongs to the class H insulation material.
According to the chemical structure of the repeating units, it can be divided into aliphatic polyimide, aromatic polyimide and aromatic semi-three. The thermal properties, can be divided into thermoplastic and thermosetting polyimide.
It means a polyimide imide ring in the main chain (-CO-NH-CO-) of a polymer, wherein the polymer containing a phthalimide structure is most important.
Polyimide as a special engineering materials, has been widely used in aviation, aerospace, microelectronics, nanotechnology, liquid separation membrane, such as a laser.
In the 1960s, countries in the polyimide of research, development and use of engineering plastics in the 21st century included in one of the most promising.
Polyimide, its outstanding performance characteristics and synthesis, either as a structural material or as a functional material, and its potential application has been fully recognized, known as a "problem solver" ( protion solver), and that "there would be no polyimide today's microelectronics technology."