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Grafted polymer proton exchange membrane and preparation method thereof

A technology of proton exchange membranes and polymers, applied in electrolyte holding devices, electrical components, circuits, etc., can solve the problems of cumbersome preparation process, expensive raw materials, unfavorable industrialization, etc., and achieve high stability, high water absorption, and high swelling rate effect

Inactive Publication Date: 2015-08-12
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It opens up ideas for the preparation of grafted polymer membrane materials, but the preparation process is very cumbersome and requires expensive raw materials, which is not conducive to the realization of industrialization

Method used

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  • Grafted polymer proton exchange membrane and preparation method thereof
  • Grafted polymer proton exchange membrane and preparation method thereof
  • Grafted polymer proton exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Main chain chloromethylation: the polymer is polyethersulfone, the solvent is toluene, chloromethylation at 55°C for 12h, DC=0.67.

[0037] Side chain preparation: Under the protection of inert gas and nitrogen, dissolve the sodium salt of p-chlorothiophenol in pyridine solution, add CuCl as a catalyst, and dissolve at room temperature; heat up to 180°C for 24 hours, precipitate the product in deionized water, and dry it fully That is, a yellow powdery polyphenylene sulfide side chain was obtained (mass ratio of sodium p-chlorothiophenate:pyridine:CuCl=1.6:30:0.015).

[0038] Side chain sulfonation: Dissolve 0.3g of side chains in 6ml of concentrated sulfuric acid, sulfonate at a constant temperature of 50°C for 36 hours, pour the sulfonated product into deionized water for precipitation, and fully dry the obtained precipitate under vacuum to obtain gray-green sulfonated polyphenylene sulfide ether.

[0039] Membrane material synthesis: Add 1 mole fraction of linking a...

Embodiment 2

[0044] Chloromethylation of the main chain: the polymer is bisphenol A polysulfone, and the solvent is HCCl 3 , Chloromethylation at 55°C for 20h, DC=1.04.

[0045] Side chain preparation: Under the protection of inert gas and nitrogen, dissolve the sodium salt of p-bromothiophenol in pyridine solution, add CuCl as a catalyst, and dissolve at room temperature; heat up to 180°C for 24 hours, precipitate the product in deionized water, and dry it fully That is, a yellow powdery polyphenylene sulfide side chain (sodium p-bromothiophenate:pyridine:CuCl=3.33:40:0.015) was obtained.

[0046] Side chain sulfonation: Dissolve 0.4g of side chains in 8ml of concentrated sulfuric acid, sulfonate at a constant temperature of 50°C for 40 hours, pour the sulfonated product into deionized water for precipitation, and fully dry the obtained precipitate under vacuum to obtain gray-green sulfonated polyphenylene sulfide ether.

[0047] Membrane material synthesis: Add 2 mole parts of linking ...

Embodiment 3

[0052] Main chain chloromethylation: the polymer is polyethersulfone, the solvent is CH 2 Cl 2 , Chloromethylation at 55°C for 12h, DC=0.99.

[0053] Side chain preparation: Under the protection of inert gas and nitrogen, dissolve the sodium salt of p-chlorothiophenol in pyridine solution, add CuCl as a catalyst, and dissolve at room temperature; heat up to 180°C for 24 hours, precipitate the product in deionized water, and dry it fully That is, a yellow powdery polyphenylene sulfide side chain was obtained, (sodium p-chlorothiophenate:pyridine:CuCl=3.mol:40:0.015).

[0054] Side chain sulfonation: Dissolve 0.4 side chains in 8ml of concentrated sulfuric acid, sulfonate at a constant temperature of 50°C for 48 hours, pour the sulfonated product into deionized water for precipitation, and fully dry the obtained precipitate under vacuum to obtain gray-green sulfonated polyphenylene sulfide .

[0055] Membrane material synthesis: Add 3 mole parts of linking agent bisphenol A a...

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Abstract

The invention discloses a grafted polymer proton exchange membrane and a preparation method thereof. The proton exchange membrane is prepared through a chloromethylated main polymer chain and a sulfonated polyphenylene sulfide side chain with low molecular weight. The preparation method comprises the following steps of chloromethylating the main polymer chain; preparing the polyphenylene sulfide side chain with low molecular weight; sulfonating the polyphenylene sulfide side chain with low molecular weight; and carrying out grafting reaction on the chloromethyl main chain and the sulfonated polyphenylene sulfide side chain with low molecular weight so as to form a membrane material. The grafted polymer proton exchange membrane and the preparation method thereof have the beneficial effects that a method for forming a grafted polymer side chain through polycondensation is provided; a side chain skeleton structure adopts an aromatic nucleus structure with characteristic stability, so that stability of the proton exchange membrane is improved; the side chain contains a large amount of sulfonic acid groups, and the volume of the side chain is larger to form enough water channels, so that the membrane is guaranteed to have high proton conductivity, and the obtained proton exchange membrane has higher water absorption, better mechanical stability and better chemical stability.

Description

technical field [0001] The invention relates to the field of fuel cell membrane materials, in particular to a grafted polymer proton exchange membrane with stable side chain structure and a preparation method thereof. Background technique [0002] Energy shortage, environmental pollution, and greenhouse effect are some major issues of global concern. With the increasing demand for energy by human beings, the problem of energy shortage has become one of the major global problems to be solved urgently. At present, people focus on the development of energy technologies with high recycling rate, low environmental pollution and high conversion rate. Fuel cell technology is a new type of energy technology that efficiently converts chemical energy stored in fuel into electrical energy. It is one of the better solutions to solve the problems of energy shortage and environmental pollution. Proton Exchange Membrane Fuel Cell (PEMFC) has many advantages: high energy conversion effici...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M8/02
CPCH01M8/0293H01M50/411Y02E60/50Y02E60/10
Inventor 张凤祥李亚婷
Owner DALIAN UNIV OF TECH