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Polyimide Benefits
Release time: 2023-09-18
(1) Excellent heat resistance. Polyimide decomposition temperature is generally more than 500 ℃, sometimes even higher, is known to be one of the highest thermal stability of organic polymers, mainly because the molecular chain contains a large number of aromatic rings.
(2) Excellent mechanical properties. The tensile strength of the unreinforced matrix material are above 100MPa. The tensile strength of Kapton film prepared with homoanhydride is 170MPa, while biphenyl polyimide (Upilex S) can reach 400MPa. the modulus of elasticity of polyimide fibre can reach 500MPa, second only to carbon fibre.
(3) Good chemical stability and resistance to heat and humidity. Polyimide materials are generally insoluble in organic solvents, corrosion resistance, hydrolysis resistance. Change the molecular design can be obtained from different structural varieties. Some varieties withstand 2 atmospheric pressure, 120 ℃, 500h of boiling.
(4) Good radiation resistance. Polyimide film in 5 × 109rad dose radiation, the strength is still maintained 86%; some polyimide fibres by 1 × 1010rad fast electron radiation, its strength retention rate of 90%.
(5) Good dielectric properties. Dielectric constant is less than 3.5, if the introduction of fluorine atoms in the molecular chain, the dielectric constant can be reduced to 2.5 or so, dielectric loss of 10, dielectric strength of 100 to 300kV/mm, volume resistance of 1015-17Ω-cm. Therefore, the synthesis of fluorine-containing polyimide materials is a more popular research area.
The above properties are stable over a wide temperature range and frequency range. In addition, polyimide has the properties of low temperature resistance, low coefficient of expansion, flame retardant and good biocompatibility. Polyimide's excellent combination of properties and versatility in synthetic chemistry has led to a wide range of applications in a variety of fields.
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