More Attentions Paid to Polyimide Film

Due to the dispersion of inorganic filler in the polymer matrix nanometer scale and the strong chemical combination between the matrix, polyimide film has more excellent mechanical properties, thermal stability compared with common kapton film materials. Polyimide film has high insulation performance and corona resistance, too. On the basis of the latest research progress of polyimide film materials, we mainly take a review at the SiO2 / Al2O3, SiO2 / Ti2O3, SiO2, TiO2, Al2O3, and SiC, MMT nano hybrid research progress ofpolyimide film. And it shows that polyimide film is a kind of nanocomposite with organic and inorganic materials. Polyimide film has excellent performance as well as extensive application prospects. But there still exists many problems to be further in-depth study.

The Research progress of polyimide film shows the latest research progress of polyimide film. Research shows that although Chinese scholars have made certain progress on structure and properties, corona resistant mechanism of polyimide film and other issues, there still has not yet key breakthrough. Corona resistance, heat shrinkage rate of the polyimide film, the mechanical strength of kapton film and many other key performances ofChina polyimide film are still far lower than Dupont products. The study of Polyimide film shows that domestic researchers’ understanding of kapton film is still in its infancy whether in theory or manufacturing process .

As for the development situation of Polyimide film, polyimide film plays an important role in  the development of high and new technology, especially in the aerospace industry, electrical and electronic industry and the development of information industry. But because polyimide film is a kind of organic polymer whose corona resistance is not high, it limits kapton film application in high voltage generator, high voltage motor, PWM power supply. This article reviews the latest research progress of polyimide film, the synthesis and characterization ofpolyimide film. kapton film has excellent comprehensive performance, it has very important application in the field of high and new technology. However, most of the polyimide is refractory, which gives difficulty toprocessing molding. And the application of polyimide film is limited to a certain degree. Thus the development of easy processed polyimide film has been paid much attention.

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Detailed Specification of Polyimide Film

A.The packaging symbol of polyimide film in storage and transportation

1, Polyimide film should be sold in roll supply rolled on the tube core. Each roll of polyimide film needs to be packed with plastic bags in a dry, clean container.

2, Each packaging box of polyimide film should indicate the type, product name, specification, batch number, gross weight, net weight, production date and polyimide film manufacturer name. And polyimide film product certificate should also be included. At the same time, polyimide film box should be marked with the words "moistureproof" and "strike".

3, Polyimide film should be stored in dry and clean room. The storage period of polyimide film is 2 year startingfrom the date of delivery. Overdue polyimide film can still be useful if it is   qualified to the standard inspection.

4, In the process of storage and transportation, polyimide film needs to be store in the places to avoid being affected by damp and mechanical damage.

B. The technical requirements of polyimide film

1, Appearance: polyimide film surface is smooth. There should be no fold, tear, pellet, air bubble, pinhole, and foreign material defects in the polyimide film surface. The edge of polyimide film also needs to be neat without damage.

 2, Size requirements of polyimide film

1) Thickness and allowable deviation: The recommended thickness of polyimide film also can   be defined according to user requirements.

2) Width: The width of polyimide film should be no less than 250 mm, with a deviation of + / - 1.6 mm. According to the users’ need, polyimide film can be adjusted to different specifications polyimide tape.

3) Length: The length of polyimide film can be specified according to user requirements.

C. Performance requirements of polyimide film
In the synthesis of polyimide film phase, it should be protected with nitrogen. The reaction time is about 3 hours. By thermo-gravimetric analysis, it shows that polyimide film has high thermal stability. 

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Polyimide Film Application

1, Photoresist: There are negative photoresist and the positive photoresist with a resolution of sub-micron. Polyimide film can be used in the color filter film combined with pigment and dye.

2, Separation membrane: Polyimide film is also widely used for various gases separation, such as oxygen and nitrogen, nitrogen and hydrogen, carbon dioxide and nitrogen or methane. Polyimide film also works as permeable membrane and ultrafiltration membrane. Because of the properties of heat resistance and solvent resistance, polyimide film has great significance on the organic gas and liquid separation.

  

3, In terms of microelectronic device, polyimide film can be used as dielectric layer, buffer layer, layer insulation, to reduce the stress and influence of environment on the device. In photoelectric material, polyimide film can be a passive or active waveguide material or optical switch.

What’s more, polyimide film is also widely used in space technology, FH machinery, electrical insulation, FPC (flexible printed circuit board), the TAB (pressure sensitive adhesive tape base material), aerospace. You can also see the appearance of polyimide film in fields like aviation, computer, electromagnetic wire, transformer, audio, mobile phone, computer, metallurgical, mining the electronic components industry. Polyimide film has great importance to automobile, transportation as well as electrical industry.

Above all, polyimide film as a polymer material with bright future development has been recognized by the industry fully. The application of polyimide film in the field of composite materials and structural materials is expanding. Polyimide film application in functional materials is emerging too. But so far, the development ofpolyimide film still hasn’t become a big variety. There are mainly two reasons. First, the cost is too high. Second, the stability of polyimide film products is poorer. But we believe that the development, production and application of polyimide film in the future will grow rapidly. In the future development, despite of inventing new varieties ofpolyimide film, we will also reduce the cost of material and improve the stability of the polyimide film product. We should devote all our strength to china polyimide film development. 

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