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Imidazoline polyether-ether-ketone/sulfonated polyether-ether-ketone blended membrane as well as preparation method and application thereof

A technology of sulfonated polyether ether ketone and imidazolidinated polyether, which is applied in the field of fuel cell ion exchange membranes, can solve the problems of polymer membrane stability degradation and the inability to use fuel cells, etc., and achieves a simple and controllable process and conditions Gentle, readily available ingredients

Active Publication Date: 2015-04-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, generally speaking, as the degree of modification increases, the stability of the polymer film decreases. For example, after the degree of modification of polyether ether ketone imidazoline is greater than 100%, it will dissolve in water, so that it cannot Can be used in fuel cells

Method used

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  • Imidazoline polyether-ether-ketone/sulfonated polyether-ether-ketone blended membrane as well as preparation method and application thereof
  • Imidazoline polyether-ether-ketone/sulfonated polyether-ether-ketone blended membrane as well as preparation method and application thereof
  • Imidazoline polyether-ether-ketone/sulfonated polyether-ether-ketone blended membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1. Preparation of imidazolidinated polyether ether ketone / sulfonated polyether ether ketone blend membrane, the steps are as follows:

[0029] Step 1. Preparation of sulfonated polyetheretherketone: Dissolve 28g of polyetheretherketone in 200mL of concentrated sulfuric acid at 25 degrees Celsius, heat up to 65 degrees Celsius, and react for 6.8 hours. After that, sulfonated polyether ether ketone is precipitated in water. 57%, wash with water until the filtrate is neutral, dry it for use.

[0030] Step 2. Preparation of chloromethylated polyether ether ketone: Dissolve 2 g of polyether ether ketone in 120 mL of concentrated sulfuric acid at -10°C. After the polyether ether ketone was completely dissolved, 40 mL of a chloromethyl octyl ether chloroform solution with a mole fraction of 70% was added, and reacted at 0 degrees Celsius for 60 min to obtain chloromethylated polyether ether ketone.

[0031] Step 3. Dissolve 0.0455g of sulfonated polyetheretherketone p...

Embodiment 2

[0032] Example 2. Preparation of imidazolidinated polyether ether ketone / sulfonated polyether ether ketone blend membrane, the steps are as follows:

[0033] Step 1 and step 2 are the same as described in Example 1 to prepare sulfonated polyetheretherketone and chloromethylated polyetheretherketone.

[0034] Step 3. Dissolve 0.0910 g of the sulfonated polyether ether ketone prepared in Example 1 with 4 mL of 1-methylimidazole to obtain solution A; The obtained chloromethylated polyetheretherketone was obtained as solution B; 4mL of solution A and 6mL of solution B were taken and mixed uniformly under vigorous stirring to obtain a casting solution, which was cast on a glass plate and placed in drying in an oven to obtain the imidazolidinated polyether ether ketone / sulfonated polyether ether ketone blend film. figure 2 It is a partial SEM image of the cross-section of the blend film prepared in Example 2.

Embodiment 3

[0035] Example 3. Preparation of imidazolidinated polyetheretherketone / sulfonated polyetheretherketone blend membrane, the steps are as follows:

[0036] Step 1 and step 2 are the same as described in Example 1 to prepare chloromethylated polyetheretherketone and sulfonated polyetheretherketone.

[0037]Step 3: Dissolve 0.1625 g of the sulfonated polyetheretherketone prepared in Example 1 with 4 mL of 1-methylimidazole to obtain solution A; The obtained chloromethylated polyetheretherketone was obtained as solution B; 4mL of solution A and 6mL of solution B were taken and mixed uniformly under vigorous stirring to obtain a casting solution, which was cast on a glass plate and placed in drying in an oven to obtain the imidazolidinated polyether ether ketone / sulfonated polyether ether ketone blend film. image 3 It is a partial SEM image of the cross-section of the blend film prepared in Example 3.

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Abstract

The invention discloses imidazoline polyether-ether-ketone / sulfonated polyether-ether-ketone blended membrane. The blended membrane has the thickness of 80-160 microns and consists of imidazoline polyether-ether-ketone and sulfonated polyether-ether-ketone, wherein the mass fraction of sulfonated polyether-ether-ketone is 0.07-0.25, the degree of sulfonation of sulfonated polyether-ether-ketone is 47%-67%, and the modification degree of imidazoline polyether-ether-ketone is 94%-200%. According to the blended membrane, chloromethylated polyether-ether-ketone with the degree of sulfonation of 94%-200% is taken as a high-polymer raw material, sulfonated polyether-ether-ketone is taken as a cross-linking agent, mixed liquid of 1-methylimidazole and N,N-diethyl formamide is taken as a solvent; in a membrane forming process, imidazoline polyether-ether-ketone is generated by virtue of in-situ reaction of chloromethylated polyether-ether-ketone and 1-methylimidazole. The prepared blended membrane has very high ion exchange capacity and ionic conductivity; furthermore, the raw materials are easily available, and the preparation process is easy, convenient and controllable.

Description

technical field [0001] The invention relates to an imidazolidinated polyether ether ketone / sulfonated polyether ether ketone blend membrane and its preparation and application, belonging to the field of fuel cell ion exchange membranes. Background technique [0002] Ion exchange membrane is the core of ion exchange membrane fuel cell. The traditional ion exchange membrane is a proton exchange membrane. However, in view of the acidic environment where the proton exchange membrane is located can corrode most metal catalysts, there are great limitations in the selection of catalysts for proton exchange membrane fuel cells, and only some stable catalysts can be selected. Precious metal catalysts such as platinum, etc., greatly increase the cost of fuel cell modules and limit the commercialization of fuel cells. [0003] Anion exchange membrane fuel cells can just overcome this shortcoming. Due to the alkaline environment, many cheap catalysts such as iron and nickel can be used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/16C08J5/22C08G8/28H01M4/94
CPCY02E60/50
Inventor 姜忠义李震曹颖李宗雨何光伟
Owner TIANJIN UNIV
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