Preparation method of polyimide porous film

A polyimide and porous film technology, which is applied in the field of preparation of polyimide porous films, can solve the problems of uneven distribution, difficult control of pore size, etc., and achieves simple preparation process, uniform and orderly distribution of pores, and controllable pore size. Effect

Inactive Publication Date: 2012-04-18
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of difficult control and uneven distribution of polyimide po...

Method used

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  • Preparation method of polyimide porous film

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Effect test

Embodiment 1

[0024] (1) Use 4,4'-diaminodiphenyl ether and pyromellitic dianhydride as monomers and N,N-dimethylformamide (DMF) as solvent to prepare viscous polyamic acid (PAA) solution . A PAA solution with a mass fraction of 3% and silicon dioxide (SiO2) with a particle size of 380 nm 2 ) colloidal balls according to the mass ratio PAA: SiO 2 =7:3 mixing, ultrasonic stirring for 3 hours to obtain a clear solution;

[0025] (2) The above PAA / SiO 2 The solution was coated on a glass plate and dried in vacuum at 60°C (vacuum degree: 0.005 MPa) to obtain PAA / SiO 2 Composite film; the PAA / SiO 2 The composite film is heated at 100°C, 200°C, and 300°C for 1 hour for imidization to obtain a polyimide / silicon dioxide composite film;

[0026] (3) Detach the polyimide / silicon dioxide composite film from the glass plate and immerse it in 10% HF solution to etch and remove SiO 2 The colloidal spheres obtained a structured porous polyimide film. The porosity of the obtained ordered polyimide p...

Embodiment 2

[0028] Prepare polyimide porous material according to the method in embodiment 1, difference is that the mass fraction concentration of polyamic acid is 6%, SiO 2 The mass ratio of colloidal balls to polyamic acid is 1:1. The porosity of the obtained ordered polyimide porous film is 40%, and the SEM electron microscope results show that the surface pore diameter of the film is 140 nanometers, and the internal pore diameter is 380 nanometers.

Embodiment 3

[0030] Prepare polyimide porous material according to the method in embodiment 1, the difference is the selected SiO 2 The particle size of the colloidal ball is 1.2 microns, polyamic acid and SiO 2 The mass ratio of colloidal spheres is 8:2, and the porosity of the obtained ordered polyimide porous film is 15%. The results of SEM electron microscopy show that the surface pore diameter of the film is 410 nanometers, and the internal pore diameter is 1.1 microns.

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Abstract

The invention discloses a preparation method of a polyimide porous film. According to the invention, silica colloid ball is used as a template; uniformly dispersed polyamide acids (PAA) / SiO2 colloidal solution is dried to obtain a PAA / SiO2 composite film with an ordered structure; the composite film is treated with thermal imidization, etched by a hydrofluoric acid solution to remove the SiO2 colloid ball, washed and dried in vacuum to obtain the polyimide porous film with an ordered structure. The invention is simply operated, at low cost and easy for industrialized production; the prepared polyimide porous material has advantages of ordered structure, ordered aperture, large strength and heat resistance, etc.

Description

technical field [0001] The invention relates to a preparation method of a polyimide porous film, in particular to a preparation method of a polyimide porous film with an ordered structure and controllable pore size. Background technique [0002] Polyimide porous material, in addition to the superior mechanical properties, dimensional stability, and solvent resistance of polyimide materials, the introduction of pores makes it have the characteristics of small density, large specific surface area, and high specific mechanical properties of porous materials. , good damping performance, etc., and for polyimide porous materials with ordered nanostructures, it can be endowed with optical, electrical, magnetic and other functionalities at the same time. Therefore, polyimide porous materials have broad application prospects in the fields of catalysis, separation and purification, biological tissue repair, optoelectronic devices, and tribology. Especially in the application of micro...

Claims

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Application Information

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IPC IPC(8): C08J9/26C08J5/18C08L79/08C08G73/10C08K3/36
Inventor 王齐华王超王廷梅
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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