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Thermosensitive conducting hydrogel with enhanced metal ion coordination and preparation method thereof

A technology of conductive hydrogel and metal ions is applied in the field of temperature-sensitive conductive hydrogel and its preparation, which can solve the problems of cumbersome preparation method, single application field, lack of fast and effective response mechanism for high-strength hydrogel, etc. To achieve the effect of simple preparation method, avoiding uneven force, and adjustable mechanical properties

Active Publication Date: 2019-03-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, at present, the preparation of high-strength hydrogels often involves complex organic synthesis steps, and the preparation methods are cumbersome. The prepared high-strength hydrogels lack a fast and effective response mechanism, and the application fields are single.

Method used

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  • Thermosensitive conducting hydrogel with enhanced metal ion coordination and preparation method thereof
  • Thermosensitive conducting hydrogel with enhanced metal ion coordination and preparation method thereof
  • Thermosensitive conducting hydrogel with enhanced metal ion coordination and preparation method thereof

Examples

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Effect test

Embodiment 1

[0051] 1. Purification of N-isopropylacrylamide: Weigh 5g of N-isopropylacrylamide, add it to 8ml of toluene, heat to 50°C to dissolve, add 25ml of n-hexane, and put the filtrate at -20°C after suction filtration Two hours later, white crystals were obtained by suction filtration, and this was repeated three times. The obtained product was vacuum-dried at 30°C, sealed and placed in a refrigerator at 5°C for later use.

[0052] 2. A method for preparing a temperature-sensitive conductive hydrogel coordinated by metal ions, comprising the steps of:

[0053] (1) The N-isopropylacrylamide purified in this example and the monomer vinylimidazole were dissolved in deionized water at a mass ratio of 2:5, with a solid content of 30% and a chemical crosslinking degree of 0.3%. , then add the crosslinking agent N,N'-methylenebisacrylamide according to 0.3% of the total monomer mole fraction, add the initiator ammonium persulfate and accelerator N,N according to 1.0% of the total monomer ...

Embodiment 2

[0059] A method for preparing a temperature-sensitive conductive hydrogel coordinated by a metal ion, comprising the steps of:

[0060] (1) Dissolve N-isopropylacrylamide and monomer vinylimidazole purified in this example in deionized water at a mass ratio of 1:1, with a solid content of 40% and a chemical crosslinking degree of 0.4%, and then Add cross-linking agent N,N'-methylenebisacrylamide at 0.2% of the total molar fraction of monomers, add initiator ammonium persulfate and accelerator N,N,N' at 1.0% of total monomer molar fraction , N'-tetramethylethylenediamine, dissolved and mixed evenly, reacted at 30°C for 20 hours for pre-polymerization, and after the reaction was complete, a chemically cross-linked hydrogel precursor was obtained;

[0061] (2) Take out the hydrogel precursor prepared in step (1), soak it in an aqueous solution with a concentration of 10mM cobalt chloride for 6h for coordination (temperature 30°C), and then soak it in water at 30°C for 6h to remov...

Embodiment 3

[0063] A method for preparing a temperature-sensitive conductive hydrogel coordinated by a metal ion, comprising the steps of:

[0064] (1) Dissolve N-isopropylacrylamide and monomer vinylimidazole purified in this example in deionized water at a mass ratio of 3:2, with a solid content of 20% and a chemical crosslinking degree of 0.2%, and then Add crosslinking agent N,N'-methylenebisacrylamide at 2.0% of the total molar fraction of monomers, add initiator ammonium persulfate and accelerator N,N,N' at 3.0% of total monomer molar fraction , N'-tetramethylethylenediamine, dissolved and mixed evenly, reacted at 20°C for 28 hours for pre-polymerization, and after the reaction was complete, a chemically cross-linked hydrogel precursor was obtained;

[0065] (2) Take out the hydrogel precursor prepared in step (1), soak in 90mM zinc nitrate aqueous solution for 10h for coordination (temperature 20°C), and then soak in 20°C water for 10h to remove excess uncrosslinked ligand The ion...

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Abstract

The invention relates to a preparation method of thermosensitive conducting hydrogel with enhanced metal ion coordination, and belongs to the technical field of the thermosensitive conducting hydrogel. The method includes the following steps: (1) dissolving monomeric vinylimidazole and N-isopropylacrylamide in deionized water, adding a crosslinking agent, an initiator and an accelerator, performing prepolymerization after dissolving and uniform mixing, and performing complete reaction to obtain a chemically crosslinked hydrogel precursor; (2) taking out the hydrogel precursor obtained in the step (1), soaking the hydrogel precursor in a solution containing divalent metal zinc, copper, cobalt and nickel ions for coordination, soaking the hydrogel precursor in water to remove redundant uncoordinated ions, and performing swelling equilibrium to obtain the metal-ion-coordinated thermosensitive conducting hydrogel. The preparation method has the advantages that the mechanical strength of the hydrogel is regulated through reversible physical cross-linking between the metal ions and a specific ligand, and the hydrogel has quick thermosensitivity and electrical conductivity.

Description

technical field [0001] The invention belongs to the technical field of high-strength temperature-sensitive conductive hydrogel, and in particular relates to a temperature-sensitive conductive hydrogel with enhanced metal ion coordination and a preparation method thereof. Background technique [0002] As a class of soft matter materials, hydrogels have attracted extensive attention in many fields, such as materials and crude drugs, due to their good biocompatibility and stimuli responsiveness. The application of hydrogel materials is usually limited by two aspects. On the one hand, due to the "soft" characteristics of the hydrogel itself, its strength is often low; on the other hand, the response rate of many stimuli-responsive gels is slow, This limits the wide application of hydrogels to some extent. Generally, when a large amount of water is absorbed in the network structure of the hydrogel and exhibits good swelling properties, its mechanical properties will be greatly w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08J3/24C08F226/06C08F220/54C08F222/38C08L39/04
CPCC08F226/06C08J3/075C08J3/24C08J2339/04C08F220/54C08F222/385
Inventor 郝京诚郭依依
Owner SHANDONG UNIV
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