Polymer homopore membrane preparation method

A polymer and porous membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effect of simple implementation steps, wide range of applicable monomers, and loose polymerization conditions

Inactive Publication Date: 2015-12-23
ZHEJIANG UNIV OF TECH
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem is that since the polymer system obtained by blending two monodisperse block copolymers is a broad molecular weight distribution system

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Polymer homopore membrane preparation method
  • Polymer homopore membrane preparation method
  • Polymer homopore membrane preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for preparing a polymer homoporous membrane, the steps are as follows:

[0033] (1) Dissolve polystyrene-block-poly(4-vinylpyridine) with a number average molecular weight of 50,000 g / mol and a molecular weight distribution index (PDI) of 1.45 into 20 wt% of 1,4-dioxane ring, 30wt% tetrahydrofuran and 50wt% N,N-dimethylformamide form a mixed solvent in which a casting solution is formed, wherein the total concentration of the block copolymer in the casting solution is 21wt%, and in the block copolymer The mass contents of polystyrene and poly(4-vinylpyridine) are 75wt%, 25wt% respectively;

[0034] (2) Standing and aging the above casting solution at room temperature of 25° C. for 12 hours;

[0035] (3) The aged casting solution is salivated into a film with a thickness of 150 μm by a scraper;

[0036] (4) the above-mentioned film is 20% relative humidity, and the temperature is 50 ℃ of air stays 30s;

[0037] (5) Immerse the flat membrane in high-purity wat...

Embodiment 2

[0041] A method for preparing a polymer homoporous membrane, the steps are as follows:

[0042] (1) Dissolve polystyrene-block-poly(4-vinylpyridine) with a number average molecular weight of 500,000 g / mol and a molecular weight distribution index (PDI) of 1.2 into 10 wt% of 1,4-dioxane ring, 60wt% tetrahydrofuran and 30wt% N, N-dimethylformamide form a mixed solvent in which a casting solution is formed, wherein the total concentration of the block copolymer in the casting solution is 31wt%, and in the block copolymer The mass contents of polystyrene and poly(4-vinylpyridine) are 65wt%, 35wt% respectively;

[0043] (2) Standing and aging the above casting solution at room temperature of 25° C. for 2 hours;

[0044] (3) The aged casting solution is salivated into a film with a thickness of 150 μm by a scraper;

[0045] (4) The above-mentioned film is left in the air with a relative humidity of 70% and a temperature of 35° C. for 1 second;

[0046] (5) Immerse the flat membra...

Embodiment 3

[0049] A method for preparing a polymer homoporous membrane, the steps are as follows:

[0050](1) The number-average molecular weight is 430,000g / mol, and the polystyrene-block-poly(4-vinylpyridine)-block-poly(methyl acrylate) whose molecular weight distribution index (PDI) is 1.19 is dissolved to 1wt% 1,4-dioxane, 49wt% tetrahydrofuran and 50wt% N,N-dimethylformamide form a mixed solvent in which a casting solution is formed, wherein the total concentration of the block copolymer in the casting solution is 26 wt%, and the mass fractions of polystyrene, poly(4-vinylpyridine) and polymethyl acrylate in the block copolymer are 65 wt%, 15 wt% and 20 wt%.

[0051] (2) Standing and aging the above casting solution at room temperature of 25° C. for 12 hours;

[0052] (3) The aged casting solution is salivated into a film with a thickness of 150 μm by a scraper;

[0053] (4) Stay 200s in the air with a relative humidity of 5% and a temperature of 75° C.;

[0054] (5) Immerse the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to view more

Abstract

The present invention relates to a polymer homopore membrane preparation method, which comprises: dissolving a polydispersed block copolymer with molecular weight distribution of greater than 1.1 into a mixing solvent to form a membrane casting solution, standing at a room temperature, casting the membrane casting solution into a thin membrane through a membrane scraping machine, standing for 1-200 s in air, immersing into a coagulation bath, and curing to form the homopore membrane. The polymer homopore membrane prepared through the method of the present invention is characterized in that the polydispersed block copolymer is adopted as the membrane forming raw material, and the purpose is to reduce the dependence of the homopore membrane preparation on the mono-dispersed block copolymer.

Description

technical field [0001] The invention relates to a preparation method of a block polymer homogeneous membrane. Background technique [0002] It is generally believed that only block copolymers with monodisperse distribution of molecular weight (molecular weight distribution index, PDI<1.1) can be well assembled to form an ordered structure. Based on this, monodisperse block copolymers synthesized by anionic polymerization are currently the only material source for the preparation of homoporous membranes by the SNIPS method. However, anionic polymerization of block copolymers required for the synthesis of homoporous membranes is not as convenient as free radical polymerization or condensation polymerization of polymer materials for membrane synthesis. From the perspective of application, the biggest problem restricting the commercial application of polymer homoporous membranes is the source of materials. Therefore, trying to partially or completely replace monodisperse bl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/80B01D67/00
Inventor 易砖沈江南周勇高从堦
Owner ZHEJIANG UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap