Nanometer porous fiber membrane with microporous/mesoporous structure and preparation method thereof

A mesoporous structure, nanoporous technology, applied in the direction of fiber type, fiber treatment, fiber chemical characteristics, etc., can solve the problems of porous material application limitations, high cost of porous membrane synthesis, unstable pore structure, etc., to achieve permanent pore structure, The effect of high porosity and stable pore structure

Active Publication Date: 2019-09-06
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the porous materials prepared by existing technologies are mostly nanoparticles, hollow microcapsules, and monolithic materials. There are still relatively few reports on two-dimensional polymer porous membranes with controllable microscopic morphology. Therefore, the application of porous materials has been greatly affected. limits
The synthesis cost of porous membrane prepared by prior art is high, mostly is macropore, and specific surface area is little (100m 2 / g or less), the pore structure is unstable, there are structural defects and other shortcomings, and it cannot be used in industrial and commercial purposes on a large scale.

Method used

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  • Nanometer porous fiber membrane with microporous/mesoporous structure and preparation method thereof
  • Nanometer porous fiber membrane with microporous/mesoporous structure and preparation method thereof
  • Nanometer porous fiber membrane with microporous/mesoporous structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The preparation method of the nanoporous fiber membrane with microporous / mesoporous structure comprises the following steps:

[0050] 1. Preparation of diblock polymer polystyrene (PS)-b-polytert-butyl acrylate (PtBA) spinning polymer raw material

[0051] Add 16.36g of tert-butyl acrylate, 73ul of N,N,N′,N″,N″-pentamethyldiethylenetriamine, 59.4mg of cuprous bromide to 30ml of N,N-dimethyl In formamide, mix well, blow nitrogen for a period of time, then add 57ul of ethyl 2-bromoisobutyrate, and react at 80°C for 48h; amide, and re-dissolved in dichloromethane, passed through a column of neutral alumina to remove the catalytic system, and then precipitated the polymer in a mixed medium of methanol / water (1:1, v) by dropwise addition, at 60 ° C Vacuum-dried to constant weight to obtain a white powder, which is a macromolecular initiator;

[0052] Add 37.44g of styrene, 28ul of N,N,N′,N″,N″-pentamethyldiethylenetriamine, and 45mg of cuprous bromide to 30ml of N,N-dimeth...

Embodiment 2

[0071] The difference between Example 2 and Example 1 is: Example 2 changes the feeding of styrene in step 1 of Example 1, adds 24.69g of styrene, and finally obtains a diblock polymer with a molecular weight of 3w-6w. That is, the content of the polystyrene part in the diblock polymer was reduced, so as to explore the influence of the polystyrene part on the properties of the final hypercrosslinked fiber membrane.

[0072] Figure 9 Shown is the physical picture of the PBA-b-PS hypercrosslinked porous fiber membrane before and after hypercrosslinking. It can be seen that the fiber membrane still has a macroscopic size after hypercrosslinking; changing the content of the PS segment in the diblock can still obtain A well-formed fibrous membrane.

Embodiment 3

[0074] The preparation method of the nanoporous fiber membrane with microporous / mesoporous structure comprises the following steps:

[0075] 1. Preparation of diblock polymer polystyrene (PS)-b-polymethyl methacrylate (PMMA) spinning polymer raw material

[0076] Add 12.78g of methyl methacrylate, 73ul of N,N,N′,N″,N″-pentamethyldiethylenetriamine, and 59.4mg of cuprous bromide to 30ml of N,N-dimethyl In base formamide, mix well, blow nitrogen for a period of time, then add 57ul of ethyl 2-bromoisobutyrate, and react at 80°C for 48h; after the reaction, remove N,N-dimethyl Formamide, and re-dissolved in dichloromethane, passed through a column of neutral alumina to remove the catalytic system, and then precipitated the polymer in a mixed medium of methanol / water (1:1, v) by dropwise addition, at 60°C Dry it under vacuum to constant weight to obtain a white powder, which is the macromolecular initiator;

[0077] Add 37.44g of styrene, 28ul of N,N,N′,N″,N″-pentamethyldiethylen...

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Abstract

The invention discloses a method for preparing a nanometer porous fiber membrane with a microporous/mesoporous structure by modifying an electrospun fiber membrane. By using an electrostatic spinningtechnology, a fiber membrane is quickly and efficiently prepared, the surface of the fiber membrane is modified, so that it is ensured that the fiber structure is not damaged in the hypercrosslinkingreaction process, and 1,2-dichloroethane as a solvent, lewis acid as a catalyst and dimethoxymethane as a hypercrosslinking agent are subjected to a Friedel-Crafts alkylation reaction to prepare the porous fiber membrane. The fiber membrane prepared by using the method has a macroscopical membrane morphology, and the problems that film forming is difficult for a porous material, and the porous material is low in specific surface area are solved. Besides, the fiber membrane obtained by using the method has a superhigh specific surface area, and the specific surface area can be up to 640.41 m<2>/g and is 10-100 times of the specific surface area of a traditional fiber membrane.

Description

technical field [0001] The invention specifically relates to a nanoporous fiber membrane with a microporous / mesoporous structure and a preparation method and application thereof, belonging to the technical field of polymer membrane separation. Background technique [0002] Early porous materials, such as zeolites, activated carbons, molecular sieves, and metal-organic framework compounds, have the advantages of high porosity, high surface acidity, and large specific surface area, and have been widely used in adsorption, separation, and catalysis. At the same time, they also have some disadvantages, such as poor controllability, single preparation conditions and difficult modification. With the development of organic porous materials, some structural defects of porous materials have been improved. Organic porous materials are composed of light elements C, N, O, and H. They are a new type of porous materials with a large number of pore structures and large specific surface ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/08B01D71/80B01J20/26B01J20/28D01F6/42D06M11/28D06M13/123D06M13/332D06M15/61B01J20/30
CPCB01D67/0002B01D69/08B01D71/80B01J20/264B01J20/28038D01F6/42D06M11/28D06M13/123D06M13/332D06M15/61D06M2101/20
Inventor 江兵兵谭文泽陈学琴李草许子强石鹏举
Owner HUBEI UNIV
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