Temperature-sensitive polymer single-ion conductive smart gel and preparation method thereof

A smart gel and polymer technology, applied in the field of polymer chemistry, can solve the problems of undiscovered temperature-sensitive polymer single-ion conductive smart gel, drop, etc., and achieve good temperature sensitivity and conductive properties, and efficient preparation effects

Active Publication Date: 2019-03-22
JIANGHAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, to the best of our knowledge, ionic conductors with an inverse-Arrhenius equation, i.e., a decrease in conductivity with increasing temperature, have not been reported
[0004] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: no temperature-sensitive polymer single-ion conductive smart gel has been found yet, and while having obvious temperature sensitivity, the ionic conductivity is between The volume phase transition temperature range of polymers tends to decrease with the increase of temperature

Method used

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preparation example Construction

[0033] Further specifically, the preparation method of the thermosensitive polymer single-ion conductive smart gel comprises the following steps:

[0034] a. Dissolving the temperature-sensitive monomer, initiator and crosslinking agent in ultrapure water under the action of ultrasound to obtain a temperature-sensitive monomer solution;

[0035]b. Add an ultrapure aqueous solution of metal salt of 2-acrylamide-2-methylpropanesulfonic acid to the temperature-sensitive monomer solution, and after mixing thoroughly, add an accelerator, and ultrasonically in an ice-water bath to make the mixture uniform , to obtain a reaction mixture, and then raise the temperature to make the metal salt of 2-acrylamide-2-methylpropanesulfonic acid copolymerize with the vinyl temperature-sensitive monomer to prepare the temperature-sensitive polymer single-ion conductive smart gel.

[0036] More preferably,

[0037] In the step a, the temperature of the ultrapure water is 0-10°C; the ultrasonic t...

Embodiment 1

[0051] Preparation of a.2-acrylamide-2-methylpropanesulfonate lithium salt (AMPSLi for short)

[0052] Dissolve 0.15mmol 2-acrylamide-2-methylpropanesulfonic acid (AMPS) in 10mL ultrapure water and stir until completely dissolved; in addition, dissolve 0.15mmol lithium hydroxide (LiOH) in 10mL ultrapure water, Thoroughly stir until completely dissolved; then mix and stir the above two solutions, and react at 15°C for 30 minutes.

[0053] b. Dissolve 14.85mmol N-isopropylacrylamide (NIPAm), 0.1mmol potassium persulfate (KPS), 1.5mmol N,N'-methylenebisacrylamide (MBA) in 10mL 0℃ ultrapure water , sonicate for 10 minutes until completely dissolved.

[0054] c. After fully mixing the solution obtained in step b with the solution obtained in step a, add 40 μL of tetramethylethylenediamine (TEMED), and sonicate in an ice-water bath at 0° C. for 10 minutes to obtain a reaction mixture. In the reaction mixture, the The concentration of the temperature-sensitive monomer is 0.495mol / L...

Embodiment 2

[0058] a. Preparation of 2-acrylamide-2-methylpropanesulfonate lithium salt (AMPSLi)

[0059] Dissolve 0.015mmol of 2-acrylamide-2-methylpropanesulfonic acid (AMPS) in 10mL of ultrapure water and stir until completely dissolved; in addition, dissolve 0.015mmol of lithium hydroxide (LiOH) in 10mL of ultrapure water, Thoroughly stir until completely dissolved; then mix and stir the above two solutions, and react at 30°C for 1 hour.

[0060] b. Dissolve 15mmol of N-isopropylacrylamide (NIPAm), 0.3mmol of potassium persulfate (KPS), and 1.5mmol of N,N'-methylenebisacrylamide (MBA) in 10mL of ultrapure water at 10°C, Sonicate for 5 minutes until completely dissolved.

[0061] c. After fully mixing the solution obtained in step b with the solution obtained in step a (the molar ratio of the vinyl thermosensitive monomer to AMPSLi is 99.9:0.1), add 100 μL of tetramethylethylenediamine (TEMED), and 10 ℃ ice-water bath ultrasonic 5 minutes, obtain reaction mixture, in described reacti...

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Abstract

The invention provides a temperature-sensitive polymer single-ion conductive smart gel and a preparation method thereof. While the temperature-sensitive polymer single-ion conductive smart gel has obvious temperature sensitivity, ionic conductivity tends to decrease near the volume phase transition temperature range of polymer as temperature increases. The preparation method is as follows: metal salt of 2-acrylamide-2-methylpropanesulfonic acid and vinyl temperature-sensitive monomer are copolymerized, so that the temperature-sensitive polymer single-ion conductive smart gel is prepared, the molar ratio of the vinyl temperature-sensitive monomer to the metal salt of 2-acrylamide-2-methylpropanesulfonic acid is 99.9:0.1 to 90:10, and the metal salt of 2-acrylamide-2-methylpropanesulfonic acid is the lithium salt, sodium salt or potassium salt of 2-acrylamide-2-methylpropanesulfonic acid.

Description

technical field [0001] The invention relates to the technical field of polymer chemistry, in particular to a temperature-sensitive polymer single-ion conductive intelligent gel and a preparation method thereof. Background technique [0002] Smart polymer gel refers to a three-dimensional network composed of cross-linked polymer chains, some of its properties / performances will change significantly under the stimulation of appropriate external conditions (such as temperature, light, pH, electric field, specific chemical reagents, etc.). These stimuli-response properties make them promising in the fields of smart sensors, smart on / off, drug delivery systems, artificial muscles / skins, tissue engineering scaffolds, and chemical / biological separation platforms. Among them, poly(N-isopropylacrylamide) (Poly(N-isopropylacrylamide), PNIPAm) is a typical temperature-sensitive polymer, when the ambient temperature is higher than its minimum critical phase transition temperature (LCST),...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/54C08F220/58C08F222/38
CPCC08F220/54C08F220/585C08F222/385
Inventor 蔡少君刘志宏郭珊珊
Owner JIANGHAN UNIVERSITY
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