Directional porous structure and preparation method thereof

A technology of porous structure and directional crystallization, which is applied in the field of directional porous structure and its preparation, can solve the problems of large energy loss, etc., and achieve the effect of small vacuum degree, regular directional porous structure and regular structure

Active Publication Date: 2019-11-01
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the freezing point of some organic solvents is lower than zero or even lower, the temperature required during the freezing process will be even lower. At this time, it is necessary to use dry ice (-78.5°C) or liquid nitrogen (-196°C) to freeze the organic solvent. This freezing process consumes a lot of energy

Method used

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  • Directional porous structure and preparation method thereof
  • Directional porous structure and preparation method thereof
  • Directional porous structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of oriented porous structure, its preparation method is as follows:

[0041] 1) Take 9g of tert-butanol (freezing point is 25.6°C), 1g of polyvinylpyrrolidone, heat and stir in a water bath at 50°C to dissolve, and make a polymer solution (10wt% polyvinylpyrrolidone);

[0042] 2) Pour the fully dissolved polymer solution into the mold (for example figure 1 shown), placed in a room temperature environment for 12h directional crystallization solidification;

[0043] 3) After being completely solidified, put it into a vacuum desiccator together with the mold (such as figure 2 shown), vacuumize to 0.05mbar, and maintain for 24h to sublimate the organic solvent, and then the polymer oriented porous material can be prepared.

[0044] The side scanning electron microscope picture of the directed porous structure pyrrolidone prepared in this embodiment is shown in image 3 , it can be seen that it has directional channels; Figure 4 , it can be seen that it has a po...

Embodiment 2

[0046] An oriented porous structure, its preparation method differs from that of Example 1 only in that: take 8.5 g of tert-butanol (freezing point is 25.6° C.) and 1.5 g of polyvinylpyrrolidone to make a polymer solution (15 wt % polyvinylpyrrolidone).

[0047] The side scanning electron microscope picture of the directed porous structure pyrrolidone prepared in this embodiment is shown in Figure 5 , it can be seen that it has directional channels; Figure 6 , it can be seen that it has a porous structure with a pore size of ~20 μm.

Embodiment 3

[0049] An oriented porous structure, its preparation method differs from that of Example 1 only in that: take 8.3 g of tert-butanol (freezing point is 25.6° C.) and 1.7 g of polyvinylpyrrolidone to make a polymer solution (17 wt % polyvinylpyrrolidone).

[0050] The side scanning electron microscope picture of the directed porous structure pyrrolidone prepared in this embodiment is shown in Figure 7 , it can be seen that it has directional channels; Figure 8 , it can be seen that it has a porous structure with a pore size of 10-15 μm.

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Abstract

The invention belongs to the field of preparation of polymer porous materials, and particularly relates to a directional porous structure and a preparation method thereof. The method comprises the following steps: 1) dissolving macromolecules in an organic solvent to prepare a macromolecule solution; 2) directionally crystallizing and solidifying the obtained macromolecule solution in a normal-temperature environment; and 3) sublimating the organic solvent of the completely solidified macromolecules under the conditions of normal temperature and vacuum, and conducting drying to obtain the directional porous structure. Compared with a common freeze drying technology, the method is separated from a low-temperature environment, does not use an expensive freeze dryer, is an environment-friendly, low-cost and low-energy-consumption process, and has the greatest advantages of low freezing temperature, small required vacuum degree, regular directional porous structure, adjustable pore diameter and the like.

Description

technical field [0001] The invention belongs to the field of polymer porous material preparation, and in particular relates to an oriented porous structure and a preparation method thereof. Background technique [0002] Freeze-drying is one of the most widely used techniques for preparing porous structures. The principle is: freeze the water-containing material at a low temperature, and then under vacuum conditions, directly sublimate the ice into water vapor and drain it, so that the material is dried. The dried material keeps its original chemical composition and physical properties (such as porous structure, etc.). The freezing process of the wet raw material is to cool it to about 2°C first, and then place it in a freeze-drying box at about -40°C for a long time to freeze to overcome the supercooling phenomenon of the solution, so that the raw material can be completely frozen and then sublimated. This process requires a large amount of refrigerant (such as freon, ammo...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08L39/06C08L33/20
CPCC08J9/28C08J2201/0482C08J2333/20C08J2339/06
Inventor 衡利苹车鹏达
Owner BEIHANG UNIV
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