Double-network ionic gel with stimulation responsiveness and self repairability

A technology of ion gel and double network, applied in the field of material chemistry, can solve the problems of poor mechanical properties of ion gel, and achieve the effect of simple preparation method, high ion conductivity, and excellent mechanical properties

Active Publication Date: 2018-10-09
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Specifically, the present invention aims at the problem of poor mechanical properties of ion gels, draws lessons from the design idea of ​​double-network structure super-strong hydrogel, and uses functional polymers to construct a double-network structure of polymers, which greatly improves ion coagulation. mechanical strength of the glue and enables stimulus-responsive repair

Method used

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  • Double-network ionic gel with stimulation responsiveness and self repairability
  • Double-network ionic gel with stimulation responsiveness and self repairability
  • Double-network ionic gel with stimulation responsiveness and self repairability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]Embodiment 1, the synthesis of poly(methyl methacrylate-co-furyl methyl methacrylate) (P(MMA-co-FMA))

[0036] Step 1: Synthesis of furyl methacrylate (FMA)

[0037]

[0038] 9.80 g of furan methanol and 15.2 g of triethylamine were added to a 250 mL dry flask, and dissolved in 100 mL of dichloromethane. Then, the mixture was stirred in an ice bath for 10 min, and 15.6 g of methacryloyl chloride was slowly added dropwise under a nitrogen atmosphere. Continue to react in ice bath for 30 min, and then react at room temperature for 12 h. After the reaction was finished, triethylamine hydrochloride was removed by filtration, and the filtrate was washed successively with saturated brine, saturated sodium bicarbonate solution, and saturated brine, and the organic phase was dried and concentrated, and the column separation method (mobile phase: n-hexane: ethyl acetate Ester ratio 10:1) yielded product 13.6 g, yield 82%.

[0039] Step 2: Synthesis of poly(methyl methacryla...

Embodiment 2

[0042] Embodiment 2, the preparation of double network ion gel

[0043] Dissolve 100 mg of P(MMA-co-FMA) synthesized above with 5 mL of dichloromethane, and 100 mg of P(VDF-co-HFP) with 5 mL of acetone, mix the two polymer solutions, and add 800 mg of ionic liquid: 1-B base-3-methylimidazoline bis(trifluoromethylsulfonyl)imide, and 5 mg of crosslinker N,N'-(4,4'-methylenediphenyl)bismaleimide. Mix and stir for 2h. The mixture was filtered with a 0.22 μm microporous membrane, poured into a suitable mold, and evaporated at room temperature for 12 hours to remove the co-solvent. Put the mold into an oven at 70°C for cross-linking, take it out after 12 hours of reaction, and demould to obtain the double network ion gel.

Embodiment 3

[0044] Embodiment 3, double network ion gel performance test

[0045] For the double-network ionogel film sample prepared above, it is cut into a dumbbell-shaped sample with the narrowest width of 4mm and a length of 3cm. Using a multifunctional testing machine, with a tensile rate of 5mm / min, the test results are obtained. Tensile stress-strain curve, test results see figure 2 . Also use this machine to test a cylindrical sample with a diameter of 1.3cm and a height of 2cm at a compression rate of 5mm / min to obtain its compressive stress-strain curve. The test results are shown in image 3 . From the test results, it can be found that the double network ion gel has excellent mechanical properties. Take about 2 mg of the gel, and use a thermogravimetric-differential thermal simultaneous tester to test its thermal stability. The test results are shown in Figure 4 , the experimental results show that the gel has good thermal stability.

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Abstract

The invention discloses double-network ionic gel with stimulation responsiveness and self repairability. Ionic liquid serves as a substrate, P(VDF-co-HFP) is used as a physical cross-linking network,dynamic covalent bond cross-linked PMA (polymethacrylate) copolymer serves as a chemical cross-linking network, and the two polymer cross-linking networks penetrate mutually to form a double network.Under synergistic effects of the double network, the ionic gel is excellent in mechanical performance, thermal stability and ionic conductivity. In addition, due to containing of reversible dynamic covalent bonds, self repairability under stimulation of light, thermal and the like can be realized. The ionic gel can be widely applied to lithium ion battery solid-state polyelectrolyte materials, gasseparation membranes, flexible electric devices, electrochemical sensors and the like.

Description

technical field [0001] The invention relates to a high-performance gel, in particular to a double-network functional gel material with an ionic liquid as a matrix, which is mainly used in gel solid electrolytes, flexible electrical devices, electrochemical sensors, etc., and belongs to the field of material chemistry. Background technique [0002] As a new type of rechargeable battery, lithium-ion battery has the advantages of high energy density, high open circuit voltage, high output power, fast charging and discharging, etc. It is widely used in smart phones, notebook computers, electric vehicles and other fields. Since the working voltage of lithium-ion batteries is much higher than the decomposition voltage of water, organic solvents are often used in lithium-ion batteries. This has brought many safety problems, such as battery leakage, explosion, and spontaneous combustion. The new polymer lithium-ion battery uses solid polymer or organic gel as the electrolyte. Altho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08J3/28C08J3/075C08L27/16C08L33/12H01M10/0565
CPCC08J3/075C08J3/246C08J3/28C08J2327/16C08J2333/12H01M10/0565Y02E60/10
Inventor 沈志豪汤哲浩范星河
Owner PEKING UNIV
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