Polyimide film-alumina template compound asymmetric porous composite material and preparation method thereof
A porous composite material and polyimide membrane technology, applied in the field of biomimetic ion channel composite materials, can solve problems such as harsh conditions, tedious and time-consuming, difficult to control and promote applications, and achieve easy control, simple operation, strong promotion and application value effect
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Embodiment 1
[0028] (1) polyimide powder is fully dissolved in chloroform to be made into the polyimide film-forming solution that mass percent is 1%;
[0029](2) At room temperature (25±1°C), evenly coat the polyimide film-forming solution obtained in step (1) into the reaction chamber and clean the honeycomb-shaped pore structure with a diameter of 10-20 nm. The diameter of the channel structure is 12mm circular porous alumina template (thickness 57-60μm), and then blow nitrogen carrying water vapor into the reaction chamber (the flow rate of nitrogen gas is 2L / min), so that the reaction chamber forms an ambient humidity of 70%-90 %, while the chloroform solvent in the polyimide film-forming solution is volatilizing, water vapor is condensed on the surface of the polyimide film-forming solution along with the volatilization of the chloroform solvent and forms water droplets to enter the polyimide In the film-forming solution, after the chloroform solvent is completely volatilized, the ob...
Embodiment 2
[0037] The preparation process is basically the same as that of Example 1, except that the aperture of the nanopores in the porous alumina template with a honeycomb nanopore structure is 20-30 nm, and the humidity of the environment formed by the reaction chamber is 80%.
[0038] Under the above conditions, a porous polyimide membrane (3.8 μm in thickness) with a honeycomb pore diameter of 1.2 μm was obtained, and the pores in the porous polyimide membrane were 1.2 μm in diameter and the In the porous alumina template, the pores at the junction of the pores with a diameter of 20 to 30 nm are connected to form an asymmetric through-hole structure in which the pores with a diameter of micrometers and pores with a diameter of nanometers are butted and connected, thereby making polyimide Asymmetric porous structure composite material composed of membrane and alumina template.
[0039] Utilize the scanning electron microscope to observe the polyimide film layer and the surface topo...
Embodiment 3
[0046] The preparation process is basically the same as that of Example 1, except that the aperture of the nanopores in the porous alumina template with a honeycomb nanopore structure is 40-70 nm, and the humidity of the environment formed by the reaction chamber is 85%.
[0047] Under the above conditions, a porous polyimide membrane (3.9 μm in thickness) with a honeycomb pore diameter of 1.3 μm was obtained, and the pores in the porous polyimide membrane were 1.3 μm in diameter and the In the porous alumina template, the pores at the junction of the pores with a diameter of 40-70nm are connected to form an asymmetric through-hole structure in which the pores with a diameter of micrometers and pores with a diameter of nanometers are butted and connected, thereby making polyimide Asymmetric porous structure composite material composed of membrane and alumina template.
[0048] Utilize the scanning electron microscope to observe the polyimide film layer and the surface topograp...
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