Polyimide is an organic polymer material.
Polyimide refers to a class of polymers containing an imide ring on the main chain, is one of the best overall performance of organic polymer materials. Its high temperature resistance of 400 ° C or more, long-term use of the temperature range -200 ~ 300 ° C, part of the melting point is not obvious, high insulation properties, 103 Hz dielectric constant 4.0, dielectric loss of only 0.004 ~ 0.007, is F to H level insulation.
Based on the chemical structure of the repeating unit, polyimide can be divided into aliphatic, semi-aromatic and aromatic polyimide three. According to the inter-chain interaction force, can be divided into cross-linked and non-cross-linked type.
Applications
1, film: one of the earliest commodities of polyimide, used for slot insulation of motors and cable winding materials. Transparent polyimide film can be used as a soft solar cell backing.
2, coatings: used as insulating varnish for electromagnetic wires, or as high temperature resistant coatings.
3, engineering plastics: thermosetting and thermoplastic, thermoplastic can be molded or injection molding or transfer molding. Mainly used for lubrication, sealing, insulation and structural materials.
4, fiber: modulus of elasticity second only to carbon fiber, as a high temperature media and radioactive material filtering materials and bulletproof, fireproof fabrics.
5, foam: used as high temperature insulation materials.