PI Laminated Board PI Laminated Board PI Laminated Board
Product Description
Polyimide is one of the organic polymer materials with the best comprehensive performance, high temperature resistance above 400℃, long-term use temperature range -200 ~ 300℃, no obvious melting point, high insulation performance, dielectric constant 4.0 under 103 Hz, dielectric loss only 0.004 ~ 0.007, F to H grade insulation materials
Polyimide refers to a class of polymers containing an imide ring (-co-N-co -) in the main chain, among which the polymer containing a phthalimide structure is the most important. As a special engineering material, polyimide has been widely used in aviation, aerospace, microelectronics, nano, liquid crystal, separation membrane, laser and other fields. Recently, the research, development and utilization of polyimide are included in the 21st century one of the most promising engineering plastics. Polyimide, because of its outstanding characteristics in performance and synthesis, whether as a structural material or as a functional material, its huge application prospects have been fully recognized, and it is believed that “without polyimide, there would be no microelectronics technology today”.
performance
1, polyimide according to thermogravimetric analysis, the start of decomposition temperature is generally around 500℃. Polyimide synthesized by dianhydride of biphenyl tetraformic acid and p-phenylenediamine has a thermal decomposition temperature of 600℃, which is one of the most thermostable varieties in polymers.
2, polyimide can withstand extremely low temperature, such as -269℃ in liquid helium will not be brittle.
3, polyimide has excellent mechanical properties, the tensile strength of unfilled plastic is more than 100Mpa, the film of benzene-type polyimide (Kapton) is more than 170Mpa, and the impact strength of plastic polyimide (TPI) is as high as 261KJ/m2. The biphenyl polyimide (Upilex S) reached 400Mpa. As an engineering plastic, the amount of elastic film is usually 3-4 gpa, and the fiber can reach 200Gpa. According to theoretical calculations, the fiber synthesized by dianhydride and p-phenylenediamine can reach 500Gpa, second only to carbon fiber.
4, some varieties of polyimide insoluble in organic solvents, to dilute acid stability, generally little varieties of resistance to hydrolysis, had the performance of this seemingly faults polyimide is different from the other one big characteristics of high performance polymer, which can take advantage of the alkaline hydrolysis of recycle material dianhydride and diamine, for example, Kapton film, its recovery rate can reach 80% 90%. Changing the structure can also get quite hydrolysis resistant varieties, such as withstand 120℃, 500 hours of water boiling.
5, polyimide thermal expansion coefficient in 2×10-5-3×10-5℃, thermoplastic polyimide 3×10-5℃, biphenyl type up to 10-6℃, individual varieties up to 10-7℃.
6. Polyimide has high radiation resistance, and the intensity retention rate of the film is 90% after 5×109rad fast electron irradiation.
7, polyimide has good dielectric properties, the dielectric constant is about 3.4, the introduction of fluorine, or the air nano size dispersed in polyimide, the dielectric constant can be reduced to about 2.5. The dielectric loss is 10-3, the dielectric strength is 100 to 300KV/mm, the polyimide is 300KV/mm, and the volume resistance is 1017Ω·cm. These performances can be maintained at a high level over a wide range of temperatures and frequencies.
8, polyimide is self-extinguision polymer, low smoke rate.
9, polyimide in a very high vacuum under very little air.
10, polyimide is non-toxic, can be used to make tableware and medical utensils, and can withstand thousands of disinfection. Some polyimides also have good biocompatibility, for example, they are non-hemolytic in blood compatibility test and non-toxic in vitro cytotoxicity test.
Quality indicators
Appearance light yellow powder
Bending strength (20℃) ≥170MPa
Density 1.38 ~ 1.43g/cm3
Impact strength (no notch) ≥28kJ/m2
Tensile strength ≥100 MPa
Veka softening point >270℃
Water absorption (25℃, 24h)
Elongation > 120%
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