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Method for preparing ordered porous film in orthogonal embossing induction manner

A technology of porous membrane and polymer membrane, applied in the field of microstructure processing of polymer membrane surface, can solve the problems of strict requirements and harsh experimental conditions, and achieve the effect of great flexibility and improved order.

Inactive Publication Date: 2015-06-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on the combination of these two microstructures with excellent properties, and most of the existing porous structures have strict requirements on the raw materials used and harsh experimental conditions.

Method used

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  • Method for preparing ordered porous film in orthogonal embossing induction manner
  • Method for preparing ordered porous film in orthogonal embossing induction manner
  • Method for preparing ordered porous film in orthogonal embossing induction manner

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Example 1. Inducing the preparation of ordered porous membranes by means of orthogonal embossing includes the following steps:

[0021] Step 1. After mixing the PDMS prepolymer and the crosslinking agent at a mass ratio of 10:1, pour it into a petri dish, and stir it fully with a glass rod to form a uniform prepolymer;

[0022] Step 2. Degas the prepolymer mixed in Step 1 for 1 hour in a circulating water-type multi-purpose vacuum pump, and then heat it at 70°C for 4 hours to dry and solidify to form a PDMS elastomer;

[0023] Step 3, cutting the PDMS elastomer prepared in step 2 into a rectangle of 6cm×2cm;

[0024] Step 4. Treat the sheet obtained in Step 3 with oxygen plasma for 30 minutes in a pre-stretched state of 10%, and then retract at a rate of 0.5% / min to obtain a PDMS wrinkle template with striped wrinkles. The wrinkle period is about 7 microns;

[0025] Step 5. Cut the PDMS wrinkle template with striped wrinkles prepared in step 4 into a square of 1 cm×1 ...

Embodiment 2

[0027] Example 2: Inducing the preparation of ordered porous membranes by means of orthogonal embossing, including the following steps:

[0028] Step one to step four are the same as embodiment 1;

[0029] Step 5. Cut the PDMS wrinkle template with striped wrinkles prepared in step 4 into a square of 1cm×1cm, and take 30μl of 50mg / ml PS / THF solution and completely spin-coat it on the cut striped wrinkled template. On one side of the wrinkled PDMS wrinkle template, vacuumize for 1.5h until the solvent evaporates completely, thereby obtaining a polystyrene film on the PDMS wrinkle template;

[0030] Step 6, the same as in Example 1, finally, a nanoscale ordered porous structure is formed on the surface of the micron-scale wrinkled structure of the base film, and the pore diameter of the pores is about 600 nanometers. figure 2 It is the SEM image of the 50 mg / ml PS / THF solution spin-coated sample of this example after being induced by a small-period wrinkle template at 140 degr...

Embodiment 3

[0031] Example 3: Inducing the preparation of an ordered porous membrane by means of orthogonal embossing, comprising the following steps:

[0032] Step one to step four are the same as embodiment 1;

[0033] Step 5. Cut the PDMS wrinkle template with striped wrinkles prepared in step 4 into a square of 1cm×1cm, and take 30μl of 60mg / ml PS / THF solution and completely spin-coat it on the cut striped wrinkled template. On one side of the wrinkled PDMS wrinkle template, vacuumize for 2 hours until the solvent evaporates completely, thereby obtaining a polystyrene film on the PDMS wrinkle template;

[0034] Step 6. Using the PDMS wrinkle template processed in step 5 as the substrate, the wrinkle template obtained in step 4 and the substrate are in face-to-face contact with each other perpendicular to the wrinkle direction of the template wrinkle and the wrinkle direction of the substrate, and placed at a temperature of 130°C After the two are contacted for 1 hour, the furnace is ...

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Abstract

The invention discloses a method for preparing an ordered porous film in an orthogonal embossing induction manner. The method comprises the following steps: preparing a pre-polymer from a PDMS pre-polymer and a cross-linking agent; degassing, drying and curing to obtain a PDMS elastic body; preparing a PDMS wrinkle template with strip-shaped wrinkles at different periods by adopting a mechanical stretching method; preparing a base with a macromolecular film; contacting the wrinkle template and the base face to face in a manner that the wrinkle directions of the wrinkle template and the base are mutually vertical; cooling the wrinkle template and the base at a macromolecular film glass transition temperature or a slightly high temperature for 1 hour to a room temperature; and removing the wrinkle template and forming a nano-grade ordered porous structure on the surface of a micron-grade wrinkle structure of a base thin film. According to the method, the ordered porous film is prepared from the PDMS wrinkle template in the orthogonal embossing manner, so that micron-grade wrinkles and nano-grade pores are organically combined, and the porous structure can be obtained by using simple instruments and equipment; and the utilization of the instruments with the high construction cost and the complicated operation steps are avoided.

Description

technical field [0001] The invention designs a surface microstructure processing technology of a polymer film, and in particular relates to a technology of combining a hole on a surface structure. Background technique [0002] Not only in the field of polymers, but also in the field of metal materials and inorganic materials, the research on porous materials has also received more and more attention. According to the size of the pores, porous materials are mainly divided into three categories: microporous materials, mesoporous materials, and macroporous materials. materials, which have potential applications in gas storage and detection, catalysis, heavy metal detection, and drug release. Similarly, wrinkle microstructure, as a technical method for preparing micron and submicron-sized clusters, is different from traditional etching methods. It has the advantages of simplicity and speed, and the wrinkle size is controllable. The preparation of large-area wrinkle patterns has ...

Claims

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Application Information

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IPC IPC(8): B81C99/00
Inventor 鲁从华陈欣侯静汪娟娟杨秀
Owner TIANJIN UNIV
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