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Method for producing a quaternary ammonium chitosan/polyving akohol membrane

A technology of quaternized chitosan and polyvinyl alcohol film, which is applied in electrical components, circuits, battery electrodes, etc., can solve the problem of alcohol barrier properties of easily poisoned proton exchange membranes, expensive Pt catalysts, and insufficient conductivity of new materials, etc. The problem is to reduce the methanol permeability coefficient, improve the electrical conductivity, and achieve the effect of low price.

Inactive Publication Date: 2012-06-06
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Direct methanol fuel cell (DMFC) has the advantages of high efficiency, high energy density, convenient fuel storage and transportation, and convenient replenishment, but there are disadvantages such as expensive Pt catalyst, easy poisoning, and unsatisfactory alcohol resistance of proton exchange membranes.
The current research on alcohol barrier membranes is on the one hand the modification of the Nafion membrane, and on the other hand is the development of new proton membrane materials, but the modification of the Nafion membrane will sacrifice the proton conductivity of the membrane, and the new material is in terms of conductivity, etc. There are also deficiencies

Method used

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  • Method for producing a quaternary ammonium chitosan/polyving akohol membrane
  • Method for producing a quaternary ammonium chitosan/polyving akohol membrane
  • Method for producing a quaternary ammonium chitosan/polyving akohol membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The specific preparation steps of the preparation method of quaternized chitosan polyvinyl alcohol film are as follows:

[0026] (1) Synthesis of quaternized chitosan

[0027] Chitosan reacts with epoxy groups to introduce quaternary ammonium groups. Weigh 2g of chitosan and place it in a three-necked bottle, add 100ml of 1wt% acetic acid solution, and stir to make the chitosan completely dissolve. The temperature of the water bath was raised to 80°C, 8g of glycidyltrimethylammonium chloride was added at one time, and the reaction was stirred at constant temperature for 8h. Such as figure 1 Shown is the reaction formula of chitosan and glycidyltrimethylammonium chloride.

[0028] (2) washing, drying

[0029] The resulting solution was precipitated with absolute ethanol, filtered, washed several times with absolute ethanol, and dried at 60° C. for 24 hours to obtain light yellow quaternized chitosan solid.

[0030] (3) Synthesis of quaternized chitosan / polyvinyl alc...

Embodiment 2

[0035] A preparation method of quaternized chitosan / polyvinyl alcohol film, the method may further comprise the steps:

[0036] (1) Synthesis of quaternized chitosan

[0037] Chitosan is dissolved in the dilute acetic acid solution that mass fraction is 1%, through sufficient stirring until completely dissolving, makes the chitosan dilute solution that mass fraction is 0.5%, then adds the quality that is 2 times of mass fraction of chitosan Substances with epoxy groups allow chitosan to react with epoxy groups to introduce quaternary ammonium groups to generate quaternized chitosan solutions;

[0038] (2) washing, drying

[0039] The quaternized chitosan solution obtained in step (1) was precipitated with absolute ethanol, filtered, washed several times with absolute ethanol, and dried at 50° C. for 12 hours to obtain a pale yellow quaternized chitosan solid;

[0040] (3) Synthesis of quaternized chitosan / polyvinyl alcohol film

[0041] Take a certain amount of quaternized ...

Embodiment 3

[0045] A preparation method of quaternized chitosan / polyvinyl alcohol film, the method may further comprise the steps:

[0046] (1) Synthesis of quaternized chitosan

[0047] Chitosan is dissolved in the dilute acetic acid solution that mass fraction is 4%, through sufficient stirring until dissolving completely, the chitosan dilute solution that makes mass fraction is 4%, then adds the quality that is 6 times of chitosan quality Substances with epoxy groups allow chitosan to react with epoxy groups to introduce quaternary ammonium groups to generate quaternized chitosan solutions;

[0048] (2) washing, drying

[0049] The quaternized chitosan solution obtained in step (1) was precipitated with absolute ethanol, filtered, washed several times with absolute ethanol, and dried at 80° C. for 48 hours to obtain a pale yellow quaternized chitosan solid;

[0050] (3) Synthesis of quaternized chitosan / polyvinyl alcohol film

[0051] Take a certain amount of quaternized chitosan an...

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Abstract

The invention relates to a method for producing a quaternary ammonium chitosan / polyving akohol membrane, comprising the following steps: (1) synthesizing the quaternary ammonium chitosan; (2) washing and drying the quaternary ammonium chitosan; (3) synthesizing the quaternary ammonium chitosan / polyving akohol membrane; and (4) scraping the quaternary ammonium chitosan / polyving akohol membrane on a flat plate and forming the quaternary ammonium chitosan / polyving akohol membrane. Compared with the prior art, the method for producing the quaternary ammonium chitosan / polyving akohol membrane adopts the raw materials of rich source and low cost, is easy and is convenient to operate.

Description

technical field [0001] The invention relates to a preparation method of a quaternized chitosan / polyvinyl alcohol membrane, which belongs to the preparation technology of anion exchange membranes for alkaline direct methanol fuel cells. Background technique [0002] Direct Methanol Fuel Cell (DMFC) has the advantages of high efficiency, high energy density, convenient fuel storage, transportation and replenishment, but there are disadvantages such as expensive Pt catalyst, easy poisoning and unsatisfactory alcohol resistance of proton exchange membrane. The current research on alcohol barrier membranes is on the one hand the modification of the Nafion membrane, and on the other hand is the development of new proton membrane materials, but the modification of the Nafion membrane will sacrifice the proton conductivity of the membrane, and the new material is in terms of conductivity, etc. There are also shortcomings. Based on the fact that the oxidation rate of methanol in alk...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/22C08L5/08C08L29/04C08B37/08H01M4/94
CPCY02E60/50
Inventor 伍艳辉刘剑张海峰梁泽磊
Owner TONGJI UNIV
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