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Synthesis of imidazole functionalized ionic liquid copolymer and preparation method of alloy ultrafiltration membrane

A technology of ionic liquids and copolymers, which is applied in the field of membrane separation, can solve the problems of unstable synthesis of ionic liquid copolymers, the performance of easily polluted small molecule ionic liquids, and poor hydrophilicity of alloy ultrafiltration membranes, and achieve free radical polymerization. Control, anti-pollution effect is remarkable, the effect of a wide range of applications

Active Publication Date: 2021-12-10
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned shortcoming of prior art, the present invention provides a kind of simple and easy imidazole functionalized ionic liquid copolymer synthesis and alloy ultrafiltration membrane preparation method, to solve the conventional alloy ultrafiltration membrane poor hydrophilicity, easy to pollute and small molecule Unstable performance of ionic liquids and the technical problems of cumbersome, high-cost, and high-operation requirements for the existing methods of synthesizing ionic liquid copolymers

Method used

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  • Synthesis of imidazole functionalized ionic liquid copolymer and preparation method of alloy ultrafiltration membrane
  • Synthesis of imidazole functionalized ionic liquid copolymer and preparation method of alloy ultrafiltration membrane
  • Synthesis of imidazole functionalized ionic liquid copolymer and preparation method of alloy ultrafiltration membrane

Examples

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Embodiment 1

[0025] 1) Synthesis of amphiphilic PMMA-b-PIL-R*

[0026] Dissolve 4.005g of MMA in dimethylacetamide solvent and place in a flask, stir magnetically, feed nitrogen into the reaction system, remove oxygen, and raise the temperature of the reaction bath to 60°C, add 0.049g of azobisisobutyl Nitrile initiator, under the protection of nitrogen, react for 2h. Weigh 5.081 g of 1-hydroxybutyl-3-vinylimidazolium tetrafluoroborate into the reaction system, and continue the reaction for 4 h under the protection of nitrogen. After the reaction, the resulting copolymer solution was immediately put into a water cooler containing an ice-water solution to cool to terminate the reaction. Then the copolymer solution is poured into ethanol for precipitation, and the product is filtered through deionized water and washed 3 times, then put into a freeze dryer and freeze-dried for 12h to obtain a white copolymer (PMMA-b-PIL-R 1 *), PMMA-b-PIL-R 1 *The value of m is 50 and the value of n is 60....

Embodiment 2

[0040] 1) Synthesis of amphiphilic PMMA-b-PIL-R*

[0041] Dissolve 10.012g MMA in dimethylacetamide solvent and place in a flask, stir magnetically, feed nitrogen into the reaction system, remove oxygen, raise the temperature of the reaction bath to 70°C, add 0.049g azobisisobutyl Nitrile initiator, reacted for 3h under nitrogen protection. Weigh 6.361 g of 1-sulfonic acid butyl-3-vinylimidazolium tetrafluoroborate and add it into the reaction system, and continue the reaction for 12 h under the protection of nitrogen. After the reaction, the resulting copolymer solution was immediately put into a water cooler containing an ice-water solution to cool to terminate the reaction. Then the copolymer solution is poured into absolute ethanol for precipitation, and the product is filtered through deionized water and cleaned 3 times, then put into a freeze dryer and freeze-dried for 10h to obtain a white copolymer (PMMA-b-PIL-R 2 *), PMMA-b-PIL-R 2 *The value of m is 70 and the val...

Embodiment 3

[0045] 1) Synthesis of amphiphilic PMMA-b-PIL-R*

[0046] Dissolve 6.072g of MMA in dimethylacetamide solvent and place in a flask, stir magnetically, feed nitrogen into the reaction system, remove oxygen, and raise the temperature of the reaction bath to 80°C, add 0.049g of azobisisobutyl Nitrile initiator, reacted under nitrogen protection for 4h. Weigh 5.641 g of 1-carboxybutyl-3-vinylimidazolium tetrafluoroborate monomer into the reaction system, and continue the reaction for 24 hours under the protection of nitrogen. After the reaction, the resulting copolymer solution was immediately put into a water cooler containing an ice-water solution to cool to terminate the reaction. Then the copolymer solution is poured into ethanol for precipitation, and the product is filtered through deionized water and washed 3 times, then put into a freeze dryer and freeze-dried for 15h to obtain a white copolymer (PMMA-b-PIL-R 3 *), PMMA-b-PIL-R 3 *The value of m is 100 and the value of ...

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Abstract

The invention discloses a method for synthesizing an imidazole functionalized ionic liquid copolymer (PMMA-b-PIL-R*) and an alloy ultrafiltration membrane. Firstly, PMMA‑b‑PIL‑R* was prepared by sequential radical polymerization using methyl methacrylate (MMA) and a polymerizable imidazole functionalized ionic liquid (IL‑R*) containing double bonds as reactive monomers. Using the non-solvent-induced phase separation method, PMMA-b-PIL-R* was introduced into the body of the polymer membrane material to prepare the alloy ultrafiltration membrane. The carbonyl group in the molecular chain of PMMA‑b‑PIL‑R* forms a hydrogen bond with the H…C‑Cl structure in the molecular chain of the polymer membrane material, which improves the molecular chain between PMMA‑b‑PIL‑R* and the polymer membrane material The compatibility between them enables it to exist stably in the ultrafiltration membrane; the imidazole group and functional functional group in the PMMA‑b‑PIL‑R* molecular chain provide good hydrophilicity. Through the above effects, the hydrophilicity, anti-fouling ability and mechanical properties of the membrane material can be simultaneously improved.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a method for synthesizing PMMA-b-PIL-R* and an alloy ultrafiltration membrane. Background technique [0002] In recent years, membrane separation technology has been highly valued by many countries in the world and widely used in water treatment. Ultrafiltration membrane has excellent characteristics such as easy preparation and chemical stability, so it is widely used, but because most ultrafiltration membrane materials are hydrophobic, it is easy to be absorbed by some organic macromolecules (colloidal particles, microorganisms, proteins, etc.) in practical applications. ) pollution, which reduces the performance of the ultrafiltration membrane, shortens the life, and increases the operating cost. Improving the hydrophilicity of the membrane surface is conducive to improving the anti-pollution performance of the membrane. Usually, a certain method is used to fix th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/30B01D67/00B01D61/14C02F1/44
CPCB01D67/0006B01D61/145C02F1/444B01D2325/36B01D67/0011B01D71/301B01D2323/08B01D67/0013B01D69/06B01D69/08B01D69/02B01D71/76B01D71/62B01D2325/16C08F120/14C08F8/32B01D2323/12B01D2323/35C08F226/06
Inventor 武春瑞汤超张仁伟厍景国吕晓龙
Owner TIANJIN POLYTECHNIC UNIV
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