Kapton/Al2O3 surface nanometer composite membrane and application

Abstract

The invention discloses a Kapton / Al2O3 surface nanometer composite membrane, which is prepared by the following steps of: performing ultrasonic cleaning on a Kapton membrane by using acetone and absolute ethanol, steeping in 1 to 5 mol / L KOH aqueous solution at room temperature for 5 to 10 minutes, taking the membrane out, and fully cleaning by using a large amount of deionized water until the membrane is neutral; steeping the membrane in 0.1 to 0.5 mol / L AlCl3 aqueous solution at the room temperature for 60 to 120 minutes, taking the membrane out, cleaning by using a large amount of deionized water, and drying naturally; and performing oxygen-containing heat treatment in a high-temperature controllable tubular furnace, heating to the temperature of between 260 and 400 DEG C from room temperature at a heating speed of between 2 and 4 DEG C / minute, keeping the temperature for 60 to 180 minutes, and cooling with the furnace. The Kapton / Al2O3 surface nanometer composite membrane can be used as a surface part of a spacecraft, and also can promote the further development of the Kapton membrane and a Kapton-based composite membrane in fields of aerospace, electrons and the like.

Description

Technical field [0001] The invention relates to a polymer-based composite film, in particular to a polymer-based composite film used on the surface of a spacecraft. Background technique [0002] Polyimide (PI for short) is a kind of high temperature resistant polymer containing imide cyclic structure on the molecular backbone. In 1961, the polypyromellitic imide film material produced by DuPont of the United States took the lead in commercialization in the world, and it was named Kapton. Compared with other polymer film materials, Kapton film materials have the following advantages: (1) High thermal stability, long-term use at temperatures above 300°C, short-term use at 400-500°C, and still not in liquid nitrogen at ~269°C Will be brittle; (2) Excellent mechanical properties, the tensile strength of Kapton film is 170MPa, has excellent wear resistance, friction reduction and heat aging resistance; (3) High chemical stability, insoluble in organic solvents, and resistant to dilut...

AI Technical Summary

Problems solved by technology

The in-situ method prepares inorganic particle-doped polyimide films, and "impurities" such as surfactants or strongly acidic anions stay in the matrix, which will promote the degradation of polymer materials; in addition, compared with surface modification, overall modification is more important for Kapton films. The mechanical properties of the surface layer are greatly affected, and the flexibility and tensile properties of general materials drop sharply, while the surface inorganic composite retains the superior properties of the matrix material in the middle, so it can be seen that the surface layer composite material has more development prospects; magnetron sputtering, sol-gel Adhesive method is used to plate dense inorganic film on the surface of Kapton film, but the bonding performance of the organic / inorganic hardness jumping interface is poor and the surface inorganic film is prone to defects such as cracking; the preparation environment of magnetron sputtering and ion implantation methods requires high vacuum properties or high temperatures, which can damage polymer materials

In addition, the cost of the above method is high, special equipment and some chemical reagents with special groups are required, and it is not practical for the preparation of large-area materials.

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