Preparation method of responsive polymeric ionic liquid hydrogel and swelling test thereof

A technology of polymerizing ionic liquids and ionic liquids, which is applied in the field of preparation of responsive polymeric ionic liquid hydrogels, can solve problems such as poor swelling, slow response, and single type, and achieve the effects of easy operation, increased water absorption rate, and increased surface area

Inactive Publication Date: 2018-10-26
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of traditional hydrogel monomer types such as single type, poor swelling property and slow response, th

Method used

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  • Preparation method of responsive polymeric ionic liquid hydrogel and swelling test thereof
  • Preparation method of responsive polymeric ionic liquid hydrogel and swelling test thereof
  • Preparation method of responsive polymeric ionic liquid hydrogel and swelling test thereof

Examples

Experimental program
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Example Embodiment

[0040] Example 1: Preparation of ionic liquid

[0041] 1. Synthesis of 1-vinyl-3-ethylimidazole bromide (EVImBr): Weigh N-vinylimidazole into the reaction flask, N 2 Under protection, ethyl bromide was added dropwise to the reaction flask, and stirred at 70°C under reflux for 20 hours to obtain a white solid. The obtained white solid product was dissolved in acetonitrile to obtain a colorless transparent solution, which was slowly added dropwise to ethyl acetate for precipitation, filtered off with suction, and dried under vacuum at 60° C. for 12 hours to obtain a white solid. The synthetic route is as follows:

[0042]

[0043] 2. Synthesis of 1-vinyl-3-hydroxyethylimidazole chloride salt (HEVImCl): add N-vinylimidazole, chloroethanol and methanol into the flask and mix, reflux and stir for 96h under nitrogen protection at 60℃ to obtain dark brown viscous liquid. The obtained viscous liquid was diluted with methanol, precipitated in ethyl acetate, kept standing in the refrigerat...

Example Embodiment

[0049] Example 2: Responsive polymeric ionic liquid hydrogel 1

[0050] (1) Preparation

[0051] Accurately weigh 6.3633g (36.4mmol) of HEVImCl prepared in Example 1, and 0.0884g (0.6mmol) of N,N'-methylenebisacrylamide into a 100ml beaker, and add a mixed solvent of methanol and ethanol (where methanol, ethanol 10ml each) stir to mix the materials uniformly, add 0.1992g (1.2mmol) of azobisisobutyronitrile to it to dissolve it, transfer the mixed solution to a 25ml single-neck flask, pass N 2 After evacuating 6 times, the flask was transferred to a 70°C oil bath and heated for 10 hours. The obtained gel is immersed in an ethanol solution, the solution is changed every certain time until the solution is clear, the gel is immersed in ultrapure water, and the water is changed every certain time until the ethanol is completely removed. A part of the obtained gel was vacuum dried at 35°C, and the other part was freeze-dried for SEM test. The synthetic route is as follows:

[0052]

[0...

Example Embodiment

[0070] Example 3: Responsive polymeric ionic liquid hydrogel 2

[0071] (1) Preparation

[0072] Accurately weigh 6.3633g (36.4mmol) of HEVImCl prepared in Example 1, and 0.0884g (0.6mmol) of N,N'-methylenebisacrylamide into a 100ml beaker, and add a mixed solvent of methanol and ethanol (where methanol, ethanol 10ml each) stir to mix the materials uniformly, add 0.11195g (0.72mmol) of azobisisobutyronitrile to it to dissolve, transfer the mixed solution to a 25ml single-neck flask, pass N 2 After evacuating 6 times, the flask was transferred to a 70°C oil bath and heated for 10 hours. The obtained gel is immersed in an ethanol solution, the solution is changed every certain time until the solution is clear, the gel is immersed in ultrapure water, and the water is changed every certain time until the ethanol is completely removed. A part of the obtained gel was vacuum dried at 35°C, and the other part was freeze-dried for SEM test.

[0073] (2) Study on the swelling performance of ...

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Abstract

The invention discloses a preparation method of a responsive polymeric ionic liquid hydrogel and a swelling test thereof. The method firstly synthesizes ionic liquid by using vinyl imidazole as a rawmaterial; 2) then using the ionic liquid prepared in step 1) as a monomer, N, N-methylene bisacrylamide as a crosslinking agent and azobisisobutyronitrile as an initiator, and synthesizing by a monomer cross-linking polymerization method. In the view of the problems of single monomer type, poor swelling property, slow response and the like of a traditional monomer, the method designs and synthesizes two ionic liquid according to the characteristics of easy design of the ionic liquid, hopes to prepare a rapid-response homopolymeric hydrogel with multiple responsiveness and the like, studies swelling behaviors, and extends polyelectrolyte hydrogel swelling kinetic models.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to a preparation method of a responsive polymerized ionic liquid hydrogel and a swelling test thereof. Background technique [0002] Polymer hydrogels are recognized as a class of environmentally friendly materials with good biocompatibility and have good application prospects in the field of biomedicine. Polymer hydrogels with environmental stimulus responsiveness, that is, smart hydrogels, have attracted more and more attention from scholars because of their various stimulus-responsive properties and the ability to conveniently select a certain property for use according to actual needs. Responsive new smart hydrogel materials have become a research hotspot. Responsive hydrogels refer to hydrogels that can respond to external environmental stimuli, and have high potential application value in the field of biomedicine and industrial and agricultural production. Ionic...

Claims

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Application Information

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IPC IPC(8): C08F226/06C08F222/38G01N5/02
CPCC08F226/06G01N5/02C08F222/38
Inventor 张国林殷子玲邱红芳吴秋华刘学矣杰宋溪明
Owner LIAONING UNIVERSITY
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