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Nanocellulose/sulfonated polyaryletherketone composite film as well as preparation method and application of nanocellulose/sulfonated polyaryletherketone composite film

A technology of sulfonated polyaryletherketone and nanocellulose, which is applied in the field of nanocellulose/sulfonated polyaryletherketone composite proton conduction membranes for fuel cells and its preparation, can solve the problem of mechanical property stability decline and proton conductivity low level problem

Active Publication Date: 2015-04-22
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the disadvantages of the decrease in the stability of the mechanical properties of the material caused by the introduction of sulfonic acid groups and the low proton conductivity at low humidity, the present invention provides a nanocellulose / sulfonated polyaryletherketone composite proton conduction membrane and its preparation method

Method used

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  • Nanocellulose/sulfonated polyaryletherketone composite film as well as preparation method and application of nanocellulose/sulfonated polyaryletherketone composite film
  • Nanocellulose/sulfonated polyaryletherketone composite film as well as preparation method and application of nanocellulose/sulfonated polyaryletherketone composite film
  • Nanocellulose/sulfonated polyaryletherketone composite film as well as preparation method and application of nanocellulose/sulfonated polyaryletherketone composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Select a 100ml three-necked flask, and install a stirring device, a nitrogen through hole, a water carrier, and a spherical condenser, and feed continuous and stable nitrogen gas into the three-necked flask, and put 2.8795g (0.015mol) of benzene pendant diphenol into the three-necked flask. , 4.8345g (0.015mol) of difluorodiketone, 2.2770g of anhydrous potassium carbonate, 24ml of sulfolane, and 12ml of toluene, reflux for three hours, and take out as much toluene as possible. Then the reaction system was heated to 180°C. After 11 hours, the solution became viscous, and 8 ml of sulfolane was added thereto. After 1 hour, the polymerization reaction was complete. Then pour the viscous liquid into 800ml of deionized water under the stirring state of a glass rod to obtain a white filamentous solid. Salts and solvents, and then dried in a vacuum oven at 120°C for 24 hours. Weigh 6.8 g of the product obtained in the previous step and add 100 ml of concentrated sulfuric acid...

Embodiment 2

[0049] The sulfonated polymer was prepared according to the steps in Example 1. Weigh 0.48 g of sulfonated phenyl side group polyether ether ketone ketone and dissolve it in 6 ml of dimethyl sulfoxide. Weigh 0.02 g of nanocellulose with sulfonic acid groups and hydroxyl groups into 6 ml of dimethyl sulfoxide, and ultrasonicate at room temperature for 24 hours.

[0050] Blend the sulfonated benzene side group polyether ether ketone ketone solution with the nanocellulose solution of sulfonic acid group and hydroxyl group, filter the blended solution with a 300-mesh nylon mesh, pour the filtrate on a glass plate, and heat it at 60°C Dry for 48 hours, then raise the temperature to 80°C and dry for 48 hours. Continue to dry the formed soft film in a vacuum oven at 100°C for 24 hours, and then remove the film after cooling. The mass fraction of nanocellulose is 4%.

[0051] The mass ratio of nanocellulose with sulfonic acid group and hydroxyl group to sulfonated phenyl side group...

Embodiment 3

[0055] In Example 1, the feeding ratio of sulfonated polyaryletherketone and nanocellulose was set to 0.47:0.03, and the feeding ratios of other components were kept unchanged, and Example 1 was repeated. A nanocellulose / sulfonated phenyl side group polyetheretherketoneketone composite membrane with sulfonic acid groups and hydroxyl groups having a mass fraction of nanocellulose of 6% is obtained.

[0056] The sulfonic acid group and hydroxyl nanocellulose / sulfonated benzene side group PEEK composite membrane prepared by this method has a proton conductivity of 0.17 S / cm and a water absorption rate of 44.06% at 80°C.

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Abstract

The invention discloses a nanocellulose / sulfonated polyaryletherketone composite film as well as a preparation method and application of the nanocellulose / sulfonated polyaryletherketone composite film, belonging to the technical field of proton conduction films of fuel cells. The mass ratio of nanocellulose to sulfonated polyaryletherketone in the composite film is (0.01-0.05): (0.45-0.49), and the nanocellulose is preferably nanocellulose containing a sulfonic group and hydroxyl. The preparation method comprises the steps of firstly, polymerizing a monomer with the sulfonic group or directly sulfonating a polymer to obtain sulfonated polyaryletherketone; and then, carrying out solution blending on sulfonated polyaryletherketone and the nanocellulose subjected to refining treatment and surface modification to prepare the nanocellulose / sulfonated polyaryletherketone composite film. The composite film disclosed by the invention can be used as a proton conduction film of a fuel cell; the film is 10-300mu m thick and has the proton conductivity of more than 10<-2>S / cm at the temperature of 20-150 DEG C, meanwhile, the permeability coefficient of methanol is reduced, and the size stability and the water absorptivity are improved.

Description

technical field [0001] The invention belongs to the technical field of proton conduction membranes for fuel cells, and in particular relates to a nanocellulose / sulfonated polyaryletherketone composite proton conduction membrane for fuel cells and a preparation method thereof. The proton conduction membrane prepared by the method has the advantages of high proton conductivity, good dimensional stability, good mechanical properties and the like. Background technique [0002] Fuel cells are recognized as the preferred clean and efficient power generation technology in the 21st century. At present, various types of fuel cells have been developed. In addition to the general advantages of fuel cells, proton exchange membrane fuel cells also have high energy conversion rates, low-temperature start-up, no leakage of electrolytic cells, no corrosion, long life, and high specific power. advantage. It has attracted great attention from all developed countries and major companies in t...

Claims

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Application Information

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IPC IPC(8): C08L71/10C08L1/02C08G65/48C08G65/40C08B15/00H01M8/10
CPCY02E60/50
Inventor 呼微刘佰军魏英聪张明耀张会轩
Owner CHANGCHUN UNIV OF TECH
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