Method for pore size regulation and modification of a uniform pore membrane using visible light induced grafting

The visible light-induced grafting method was used to modify the pore size and surface of uniformly porous membranes, which solved the problems of high cost and poor universality in the preparation of uniformly porous membranes in the existing technology. It enabled flexible control of pore size and separation performance under mild conditions, improved separation selectivity and reduced the risk of light pollution.

CN117679961BActive Publication Date: 2026-06-26ZHEJIANG UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV OF TECH
Filing Date
2023-12-29
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing technologies for preparing uniformly porous membranes suffer from problems such as high cost, demanding conditions, limited applicability, and difficulty in large-scale application, making it difficult to effectively control pore size and separation performance.

Method used

The pore size of uniformly porous membranes was controlled and modified by visible light-induced grafting. The grafting reaction was carried out by amphiphilic block copolymers under visible light irradiation. Thioesters were used as chain transfer agents to control the grafting process of molecular chains in the membrane pores, avoiding the use of photoinitiators. The chemical modification was carried out by taking advantage of the penetration depth and flexibility of visible light.

Benefits of technology

It enables flexible control of the pore size and surface properties of uniformly porous membranes under mild conditions, improves separation selectivity, reduces operating costs, is applicable to different monomers and block copolymers, and reduces the risk of light pollution.

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Abstract

The application discloses a method for pore size regulation and modification of a uniform pore membrane by visible light induced grafting, comprising the following steps: dissolving an amphiphilic block copolymer in a mixed solvent, and preparing a uniform pore membrane by self-assembly and phase inversion process; the amphiphilic block copolymer is synthesized by reversible addition-fragmentation chain transfer polymerization, and contains a thioester on a molecular chain; the mixed solvent is composed of dimethylformamide and tetrahydrofuran, or composed of dimethylformamide and dioxane; the uniform pore membrane is transferred into a reaction solution, and irradiated by visible light in an air or inert gas atmosphere; the reaction solution is a homogeneous aqueous solution containing a hydrophilic monomer, the wavelength range of the visible light is 380-800 nm, and the power range is 2-50 w; and the irradiated membrane is cleaned by using deionized water or an ethanol aqueous solution, so that a visible light irradiation grafted and modified uniform pore membrane is obtained. The grafting reaction on the uniform pore membrane can be realized under visible light irradiation, and the method has mild conditions and simple operation.
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