Preparation method of quaternized chitosan anion hybrid membrane doped with positive polystyrene latex

A technology of quaternized chitosan and polystyrene emulsion, applied in electrochemical generators, fuel cell parts, circuits, etc., can solve the problem of increasing methanol permeability, decreasing membrane electrolyte conductivity, and low conductivity and other problems, to achieve the effect of increasing the ion exchange capacity and electrical conductivity, and reducing the methanol permeability

Inactive Publication Date: 2012-07-04
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the doping of inorganic substances can inhibit the permeability of methanol, its poor compatibility with polymers leads to a decrease in the uniformity, conductivity, and mechanical properties of the film.
For example has been found in Nafion ? Doping NaA zeolite in the membrane can effectively inhibit the permeability of methanol, but at the same time, it is also found that nano-sized micropores appear on the interface between the inorganic dopant and the polymer matrix, and the appearance of these micropores may cause methanol to pass through. rate of re-increase
In addition, the doping of inorganic substances...

Method used

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  • Preparation method of quaternized chitosan anion hybrid membrane doped with positive polystyrene latex
  • Preparation method of quaternized chitosan anion hybrid membrane doped with positive polystyrene latex
  • Preparation method of quaternized chitosan anion hybrid membrane doped with positive polystyrene latex

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Experimental program
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Effect test

Embodiment 1

[0030] (1) Add styrene, absolute ethanol and deionized water into the container in sequence according to the volume ratio of 1:5:10 to form a mixed solution, and then add cetyltrimethylammonium bromide to the mixed solution And potassium persulfate, wherein the add-on of cetyltrimethylammonium bromide is 0.5% of the mixed solution quality, is one-time addition, and the add-on of potassium persulfate is 0.1% of the mixed solution quality, when adding Divide into four equal parts, add one part every 1.5h, add cetyltrimethylammonium bromide and potassium persulfate to the reaction mixture completely, and react at 80°C for 6 h under the condition of nitrogen protection to prepare A positively charged polystyrene emulsion with a concentration of 6.25 wt% was prepared, and after the temperature was lowered to room temperature, it was sealed and stored for later use;

[0031] (2) Put chitosan and isopropanol in a round-bottomed flask at a mass ratio of 1:4, heat in a water bath to 85...

Embodiment 2

[0036] (1) Add styrene, absolute ethanol and deionized water into the container in sequence according to the volume ratio of 1:5:10 to form a mixed solution, and then add cetyltrimethylammonium bromide to the mixed solution And potassium persulfate, wherein the add-on of cetyltrimethylammonium bromide is 5% of the mixed solution quality, is one-time addition, and the add-on of potassium persulfate is 0.25% of the mixed solution quality, when adding Divide into four equal parts, add one part every 1.5h, add cetyltrimethylammonium bromide and potassium persulfate to the reaction mixture completely, and react at 80°C for 6 h under the condition of nitrogen protection to prepare A positively charged polystyrene emulsion with a concentration of 6.25 wt% was prepared, and after the temperature was lowered to room temperature, it was sealed and stored for later use;

[0037] (2) Put chitosan and isopropanol in a round-bottomed flask at a mass ratio of 1:4, heat in a water bath to 85°...

Embodiment 3

[0042] (1) Add styrene, absolute ethanol and deionized water into the container in sequence according to the volume ratio of 1:5:10 to form a mixed solution, and then add cetyltrimethylammonium bromide to the mixed solution And potassium persulfate, wherein the add-on of cetyltrimethylammonium bromide is 3% of the mixed solution quality, is one-time addition, and the add-on of potassium persulfate is 0.2% of the mixed solution quality, when adding Divide into four equal parts, add one part every 1.5h, add cetyltrimethylammonium bromide and potassium persulfate to the reaction mixture completely, and react at 80°C for 6 h under the condition of nitrogen protection to prepare A positively charged polystyrene emulsion with a concentration of 6.25 wt% was prepared, and after the temperature was lowered to room temperature, it was sealed and stored for later use;

[0043] (2) Put chitosan and isopropanol in a round-bottomed flask at a mass ratio of 1:4, heat in a water bath to 85°C...

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Abstract

The invention relates to the technical field of fuel cells, in particular to a preparation method of a quaternized chitosan anion hybrid membrane doped with positive polystyrene latex. The preparation method comprises the following steps of: (1) preparing the positive polystyrene latex; (2) preparing quaternized chitosan; (3) dissolving the quaternized chitosan powder into acetic acid solution with the concentration being 2wt%, then adding the prepared positive polystyrene latex, forming membrane casting liquid, stirring the membrane casting liquid for 4 hours under the room temperature, and carrying out ultrasonic treatment for 20-40 minutes; then adding glutaraldehyde at the speed of 0.5mLmin<-1> with the adding amount accounting for 0.1-0.3% of the total volume of the membrane casting liquid, stirring for 1 hour, then carrying out ultrasonic treatment for 30 minutes, finally pouring the solution subjected to ultrasonic treatment on a horizontal glass plate, and evaporating a solvent at the temperature of 40 DEG C to form the hybrid membrane; and (4) carrying out after treatment on the hybrid membrane. According to the preparation method, the ion exchange capacity and the electric conductivity of the hybrid membrane are high, and the methanol penetration rate is low.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a method for preparing a quaternized chitosan anion composite membrane doped with a positively charged polystyrene emulsion. Background technique [0002] In the field of fuel cells, direct methanol fuel cells (DMFC) have attracted more and more attention because of their advantages such as convenient transportation and storage, and high energy density. The membrane electrolyte currently used in direct methanol fuel cells is mainly Nafion with a perfluorosulfonic acid structure produced by DuPont of the United States. ? membrane. Nafion ? The proton conductivity of the membrane is high and the chemical stability is good, but the methanol permeability of the membrane is also high. When it is used as a membrane electrolyte in a direct methanol fuel cell, it will cause the fuel methanol to pass through the membrane electrolyte and generate at the cathode Mixing potentials, wh...

Claims

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Application Information

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IPC IPC(8): C08J7/00C08J5/22C08J3/22C08L25/06C08L5/08C08B37/08H01M2/16H01M8/02H01M8/1081
CPCY02E60/12Y02E60/50
Inventor 何荣桓王吉林车全通
Owner NORTHEASTERN UNIV
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