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A preparation method of temperature and pH dual response intelligent switch membrane using core-shell structure microgel as switch

A technology of smart switch and core-shell structure, applied in the field of separation membrane, can solve the problem of poor response performance of smart switch membrane, achieve excellent temperature and pH dual response performance and reversible response performance, excellent reversible response performance, excellent temperature and pH The effect of responsive performance

Active Publication Date: 2022-01-14
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the grafting can only be carried out in the pores close to the surface of the membrane, it is difficult to carry out in the internal pores of the membrane, and the fragility of the chain polymer leads to poor response performance of the prepared smart switch membrane.

Method used

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  • A preparation method of temperature and pH dual response intelligent switch membrane using core-shell structure microgel as switch
  • A preparation method of temperature and pH dual response intelligent switch membrane using core-shell structure microgel as switch
  • A preparation method of temperature and pH dual response intelligent switch membrane using core-shell structure microgel as switch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In this example, a dual-response smart switch membrane with core-shell structure microgel as a switch and its preparation method are as follows:

[0047] (1) Synthesis of P4VP nuclear microgel: Add 0.8mmol of cross-linking agent N,N-methylenebisacrylamide, 0.042mmol of surfactant dodecyltrimethylammonium chloride and 400mL of deionized water into three wells In the flask, heat to 40°C and stir to dissolve under the protection of nitrogen; stop stirring, add 8mmol 4-vinylpyridine, heat up to 75°C, then add 0.4mmol initiator 2,2'-azobisisobutylamidine disalt salt, and begin stirring. Under nitrogen protection, react at 75° C. for 4 hours to obtain P4VP microgel suspension.

[0048] The concentrations of 4-vinylpyridine, N,N-methylenebisacrylamide and dodecyltrimethylammonium chloride in deionized water are respectively 20mmol / L, 2mmol / L, and 0.105mmol / L, triggering The dosage is 5% of the total monomeric (4-vinylpyridine and N,N-methylenebisacrylamide) species.

[0049...

Embodiment 2

[0061] In this example, the process steps of the preparation method of a dual-response smart switch membrane with a core-shell structure microgel as a switch with temperature and pH stimulus responses are the same as in Example 1, the difference is only in step (2) The amount of N-isopropylacrylamide in the medium was changed to 8 mmol, the obtained P4VP core / PNIPAM shell microgel was marked as 4N1, and the obtained smart switch membrane was marked as membrane M1. The temperature and pH response properties of microgel 4N1 are detailed in Figure 7 and Figure 8 ; The SEM image of the channel surface of the membrane M1 is shown in the attached Figure 5 ; The temperature and pH stimulus-responsive water flux and switching coefficient of membrane M1 are detailed in the appendix Figure 9 and Figure 10 ; The temperature and pH circulating water flux and switch coefficient of membrane M1 are detailed in the appendix Figure 11 and Figure 12 .

Embodiment 3

[0063]In this example, the process steps of the preparation method of a dual-response smart switch membrane with a core-shell structure microgel as a switch with temperature and pH stimulus responses are the same as in Example 1, the difference is only in step (2) The amount of N-isopropylacrylamide in the medium was changed to 24 mmol, the obtained P4VP core / PNIPAM shell microgel was marked as 4N3, and the obtained smart switch membrane was marked as membrane M3. The temperature and pH response properties of microgel 4N3 are detailed in Figure 7 and Figure 8 ; The SEM picture of the channel surface of the membrane M3 is shown in the attached Figure 6 ; The temperature and pH stimulus-responsive water flux and switching coefficient of membrane M3 are detailed in the appendix Figure 9 and Figure 10 ; The temperature and pH circulating water flux and switch coefficient of membrane M3 are detailed in the appendix Figure 11 and Figure 12 .

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Abstract

A method for preparing a temperature and pH dual-response intelligent switch membrane using a core-shell structure microgel as a switch, the preparation method comprising: (1) dispersing the P4VP core / PNIPAM shell microgel in N,N-dimethylformaldehyde In base formamide, stir and sonicate until the microgel is completely dispersed, then add polyvinylidene fluoride, stir until polyvinylidene fluoride is completely dissolved, and let stand to remove air bubbles to obtain a homogeneous casting solution; the homogeneous casting In the membrane liquid, the mass content of polyvinylidene fluoride is 9-11%, the mass content of P4VP core / PNIPAM shell microgel is 1.4-1.6%, and the balance is N,N-dimethylformamide; (2) Cast the casting solution on a clean glass plate, scrape the film with a flat scraper, immediately put the wet film into the coagulation bath for phase separation to form a film, soak the completely phase-separated film in deionized water to extract the residue, Get a smart switch membrane. The invention effectively segregates the core-shell structure microgel to the surface of the pores of the membrane in situ, and prepares an intelligent switch membrane with excellent dual-response and reversible-response properties of temperature and pH.

Description

technical field [0001] The invention belongs to the technical field of separation membranes, and in particular relates to a preparation method of a temperature- and pH-responsive intelligent switch membrane using a core-shell structure microgel as a switch. Background technique [0002] Membrane separation technology has been widely used in chemical / biological separation, environmental engineering, energy recovery and water treatment. However, traditional porous membranes (such as ultrafiltration, nanofiltration, and reverse osmosis) severely limit their effective applications due to their unchangeable pore structure and single selectivity. Therefore, smart switch membranes with the ability to self-regulate pore size and change selectivity / permeability have attracted more and more attention from researchers. So far, people have designed and manufactured smart switch membranes that can self-adjust the size of the pore size according to changes in the external chemical / physic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00B01D61/14B01D67/00C02F1/44
CPCB01J13/0065B01D61/145B01D67/0016B01D67/0002C02F1/444B01D2323/46C02F2209/02C02F2209/06
Inventor 沈江南刘华文高从堦
Owner ZHEJIANG UNIV OF TECH
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