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Elemental oxygen degradation resistant polyimide material and method of producing the same

A technology of polyimide and anti-atomic oxygen, applied in the field of organic-inorganic hybrid polyimide materials and their preparation

Inactive Publication Date: 2009-04-08
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problem that polyimide materials used in spacecraft are severely corroded by atomic oxygen in low earth orbit and the deficiency of the existing anti-atomic oxygen denudation technology, and provides an organic-inorganic hybrid anti-atomic oxygen denudation technology by using a synergistic mechanism. Polyimide material and preparation method thereof

Method used

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  • Elemental oxygen degradation resistant polyimide material and method of producing the same
  • Elemental oxygen degradation resistant polyimide material and method of producing the same
  • Elemental oxygen degradation resistant polyimide material and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] At room temperature, in a three-necked bottle, first fully dissolve 30.83g of phosphorus-containing diamine monomer DAPPO in N,N'-dimethylacetamide (DMAc), and then add in batches when the solution is clear and no particles are seen. 3,3',4,4'-biphenyldianhydride (BPDA) with the amount of diamine and other substances. After stirring and reacting for about 4 hours, 22.1 g of tetraethyl orthosilicate (TEOS) was added as an inorganic component, and stirring was continued for 8 hours to obtain a uniform and viscous precursor polyamic acid (PAA) solution.

[0020] Apply the precursor solution to clean glass, scrape out a layer of liquid film about 0.25mm thick with a glass rod wrapped with copper wire, and place it horizontally in a far-infrared drying oven to achieve imide through temperature programming control. The heating program is: 60°C / 1h, 80°C / 1h, 120°C / 1h, 150°C / 1h, 200°C / 1h, 250°C / 1h, 300°C / 1h, after cooling to room temperature, the film is removed to obtain Polyi...

Embodiment 2

[0031] Change the quality of the inorganic component ethyl orthosilicate to 44.2g, and the others are the same as in Example 1.

Embodiment 3

[0033] Change the inorganic component into 19.3g tetra-n-butyl zirconia, and the others are the same as in Example 1.

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Abstract

The invention relates to a polyimide material denuded by anti-atomic oxygen and a preparation method thereof. An organic component containing phosphorus and an anti-atomic oxygen inorganic component are injected into a polyimide solution or a polyimide precursor solution simultaneously in accordance with a certain proportion so as to prepare an organic-inorganic hybrid polyimide material denuded by the anti-atomic oxygen. An effectiveness test of the atomic oxygen shows that when the accumulative flux of atomic oxygen of the organic-inorganic hybrid polyimide material reaches 6.08 multiplied by 10<20>atom / cm<2>, and the atomic oxygen denudation rate can decrease lower than 15 percent of pure polyimide which is obviously better than the atomic oxygen denudation property of the pure polyimide.

Description

technical field [0001] The invention relates to a polyimide material which is resistant to atomic oxygen ablation and a preparation method thereof, in particular to an organic-inorganic hybrid polyimide material containing an organic phosphorus group and an anti-atomic oxygen inorganic component and its preparation method. Background technique [0002] When a spacecraft is operating in a low earth orbit (Low Earth Orbit, LEO) 100-1000 km above the ground, it must withstand atomic oxygen (Atomic Oxygen, AO), vacuum ultraviolet radiation (Vacuum Ultraviolet, VUV), small debris impacts, and VUV and AO The test of extreme environments such as synergy. Among them, atomic oxygen can interact with almost all organic materials and some inorganic materials, resulting in oxidative denudation and performance degradation of the material surface. Numerous ground simulation tests at home and abroad and NASA flight experiments (STS-8, STS-17, STS-41, STS-44), long-term exposure test (LDE...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K3/36C08K3/22C08G73/10
Inventor 王凯詹茂盛苏英霞
Owner BEIHANG UNIV
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