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Polyimide film and its preparation method and application

A polyimide film and thermal protection technology, applied in the field of space environment stable polymer materials, can solve the problems of difficult to meet the requirements of space vehicle optical components, poor optical transparency of the film, etc.

Active Publication Date: 2014-10-29
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the aODPA-ODA type PI film has good stability in the space environment, the optical transparency of the film is relatively poor, and it is difficult to meet the needs of space vehicle optical components.

Method used

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  • Polyimide film and its preparation method and application
  • Polyimide film and its preparation method and application
  • Polyimide film and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1, prepare polyimide by aODPA and 1,4-bis(4-aminophenoxy)benzene (144APB)

[0049] 1) Add 0.01mol (2.9233g) of 144APB and 15ml of N-methylpyrrolidone (NMP) into a 100ml three-necked flask equipped with a nitrogen inlet. After stirring at room temperature to dissolve completely, add 0.01mol (3.1021g) aODPA, and continue stirring at 20°C for 24 hours to obtain a homogeneous liquid system;

[0050] 2) Add 0.03mol (2.86ml) acetic anhydride and 0.03mol (2.45ml) pyridine to the homogeneous liquid system obtained in step 1), continue to stir for 24h, and the polyimide compound shown in the formula II is obtained after the reaction is completed. It is a yellow viscous solution, and the mass percentage of the target product is 18%;

[0051] 3) Pour the yellow viscous solution obtained in step 2) into 300ml of ethanol to obtain a white filamentous solid. Collect the solid, wash it with ethanol three times, and dry it in an oven at 80° C. for 12 hours under normal pre...

Embodiment 2

[0069] Embodiment 2, prepare polyimide by aODPA and 1,3-bis(3-aminophenoxy)benzene (133APB)

[0070] 1) Add 0.01mol (2.9233g) 133APB and 15ml m-cresol to a 100ml three-necked flask equipped with a nitrogen inlet. After stirring at room temperature to dissolve completely, add 0.01mol (3.1021g) aODPA, and continue stirring at 25°C for 25 hours to obtain a homogeneous liquid system;

[0071] 2) Add 0.03mol (2.86ml) acetic anhydride and 0.03mol (2.45ml) pyridine to the homogeneous liquid system obtained in step 1), and continue to stir for 25h. After the reaction is completed, the polyimide compound shown in formula III is obtained. The product system It is a yellow viscous solution, and the mass percentage of the target product is 25%;

[0072] 3) Pour the yellow viscous solution obtained in step 2) into 300ml of ethanol to obtain a white filamentous solid, collect the solid, wash it with ethanol three times, and dry it in an oven at 80°C for 12 hours at normal pressure to obtai...

Embodiment 3

[0090] Embodiment 3, prepare polyimide by aODPA and two [4-(4-aminophenoxy) phenyl] hexafluoropropane (BDAF)

[0091] 1) Add 0.01mol (5.1845g) BDAF and 15ml N-methylpyrrolidone (NMP) into a 100ml three-necked flask equipped with a nitrogen inlet. After stirring at room temperature to dissolve completely, add 0.01mol (3.1021g) aODPA, and continue stirring at 25°C for 20 hours to obtain a homogeneous liquid system;

[0092] 2) Add 0.03mol (2.86ml) acetic anhydride and 0.03mol (2.45ml) pyridine to the homogeneous liquid system obtained in step 1), and continue to stir for 20h. After the reaction is completed, the polyimide compound shown in formula IV is obtained. The product system It is a yellow viscous solution, and the mass percentage of the target product shown in the formula IV is 18%;

[0093]3) Pour the yellow viscous solution obtained in step 2) into 300ml of ethanol to obtain a white filamentous solid. Collect the solid, wash it with ethanol three times, and dry it in...

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Abstract

The invention discloses a polyimide film and a preparation method and applications thereof. The compound forming the polyimide film is the compound of which structural general formula is shown in the formula I. The preparation method of polyimide is as follows: aromatic dianhydride 2,3,3',4'-diphenyl ether tetracarboxylic acid dianhydride (aODPA) and a series of aromatic diamine monomers are used as raw materials to prepare polyimide resin through chemical imidization. The polyimide film prepared by the technology has good optical transparency, low solar absorptivity-emissivity ratio and good thermal stability, and can be used to prepare the thermal protection device of the spacecraft, the solar cell array substrate and the antenna reflector / collector or solar sail and have important application value.

Description

technical field [0001] The invention belongs to the field of space environment stable polymer materials, and relates to a polyimide film with high transparency and low solar absorption and emission ratio, its preparation method and application. Background technique [0002] Spacecraft are often exposed to complex space environments during operation, such as high and low temperature cycles, ultraviolet and deep ultraviolet radiation, charged particle radiation, cosmic dust and debris, and atomic oxygen in low earth orbit (LEO). These harsh environments will cause the degradation of the surface and interior polymer materials of the spacecraft, thereby seriously affecting the life of the spacecraft in orbit (Dever J, Banks B, Groh K D, Miller S.Degradation of spacecraft materials, in Handbook of Environmental Degradation of Materials, Kuta M (ed.), William Andrew, New York, 2005, pp 465-501). In order to prolong the service life of the spacecraft in orbit, it is necessary to p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C08L79/08
Inventor 杨士勇李卓宋海旺刘金刚
Owner INST OF CHEM CHINESE ACAD OF SCI