What is PI film

PI film is a polymer material made by polycondensing pyromellitic dianhydride (PMDA) and diaminodiphenyl ether (ODA) in a strong polar solvent and casting into a film, and then imidizing.

Ⅰ. Performance characteristics

1. Mechanical properties: PI film has excellent tensile strength, which can reach 200MPa at 20℃, and can even maintain a strength of more than 100MPa at 200℃.

2. Electrical properties: Its dielectric constant is less than 3.5, the dielectric loss is low, the dielectric strength is as high as 100 to 300kV/mm, and the volume resistivity is 10¹⁵-¹⁷Ω·cm. These excellent dielectric properties remain stable over a wide temperature range and frequency range.

3. Thermal properties: The glass transition temperature of PI film is as high as 280℃, and it can be used for a long time in a wide temperature range of -269℃ to 400℃, and can even withstand high temperatures of up to 400℃ for a short time.

4. Chemical stability: PI film is insoluble in organic solvents, corrosion-resistant, hydrolysis-resistant, and has high radiation resistance.

Ⅱ. Application fields

PI film is widely used in many fields due to its excellent performance:

1. Electronic field: As a flexible printed circuit board substrate and various high-temperature resistant motor and electrical insulation materials, it is known as a "problem solver".

2. Aerospace field: It is widely used due to its excellent high and low temperature resistance and electrical insulation performance.

3. Wind power generation, rail transit: PI film also plays an important role in these fields.

4. Flexible display: As the penetration rate of flexible display increases, the high transmittance, bending resistance, scratch resistance and other characteristics of PI film are particularly important.