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Ultrathin cross-linked composite enhanced polymer anion exchange membrane and preparation method and application thereof

A composite reinforcement, polymer technology, used in fuel cells, electrochemical generators, electrical components, etc., can solve the problem that low-grade secondary amines cannot be highly cross-linked with polymer backbones, there is little room for improvement of membrane stability, and polymer substrates It contains ether bonds and other problems to achieve excellent dimensional stability and chemical stability, improve computer efficiency and dimensional stability, and simplify the film-making process.

Active Publication Date: 2020-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that its preparation process is relatively complicated, and the low-level secondary amines used cannot really achieve a high degree of cross-linking between the polymer backbones, so there is not much room for improvement in membrane stability, and at the same time, part of the chloromethyl group is occupied after cross-linking. Make it impossible to continue quaternization, thereby reducing the number of quaternary ammonium groups, resulting in a smaller ion exchange capacity
Dalian Institute of Chemical Physics (Chinese patent: a preparation method of cross-linked polymer anion exchange membrane, patent application number: 201110427128.2) discloses a preparation method of polyaryl ether sulfone ketone cross-linked anion exchange membrane. Compared with the preparation method of quaternization after film formation, the anion exchange membrane obtained by the present invention has a higher ion exchange capacity, but its polymer base contains ether bonds, etc. Degradation and other issues

Method used

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  • Ultrathin cross-linked composite enhanced polymer anion exchange membrane and preparation method and application thereof
  • Ultrathin cross-linked composite enhanced polymer anion exchange membrane and preparation method and application thereof
  • Ultrathin cross-linked composite enhanced polymer anion exchange membrane and preparation method and application thereof

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Embodiment 1

[0035] Dissolve polyvinylbenzyl chloride with molecular weight Mn≈130000 in N-methylpyrrolidone (NMP) at a concentration of 2g / mL, stir at room temperature for 1 hour, and then add crosslinking agent N,N,N' into the solution , N'-tetramethyl-1,6-hexanediamine (TMHDA), stirred at room temperature for 5 seconds to obtain a casting solution; the porous PE base film (PE, thickness 10μm, porosity 45%, average pore diameter 0.1-0.3 μm) on the peel-off polyester sheet, take a certain amount of casting liquid and spread it on the base film, and cover the surface with a layer of peel-off polyester sheet to form a "sandwich" structure, and use the flat plate to drive out the air bubbles, and scrape The coating is smooth; the cast film plate with a "sandwich" structure is sandwiched between the graphite plates, and placed on an 80°C hydraulic press for 0.5 hours, with a pressure of 2MPa. After removal, the membrane was peeled off from the polyester sheet to obtain the crosslinked and qua...

Embodiment 2

[0041] Dissolve polystyrene-ethylene-butylene-styrene (SEBS) with molecular weight Mn≈130000 in N,N-dimethylacetamide (DMAc) at a concentration of 1 g / mL, stir at room temperature for 1 hour, and then Add the cross-linking agent N,N,N',N'-tetramethylmethylenediamine (TMMDA) into the solution, stir at room temperature for 300 seconds to obtain the casting solution; the porous polytetrafluoroethylene porous membrane (PTFE, thickness 5 μm, Porosity 30-60%, average pore diameter 0.5μm). Spread it on the peel-off polyester sheet, take a certain amount of casting liquid and spread it on the base film, and then cover the surface with a layer of peel-off polyester sheet to form a "sandwich" structure, and use the flat plate to drive out the air bubbles, and scrape it evenly ; Sandwich the cast-film plate with the “sandwich” structure between the graphite plates, place it on a hydraulic press at 90°C for 0.2 hours, and press at a pressure of 4 MPa. After removal, the membrane was peel...

Embodiment 3

[0045] Dissolve chloromethylated styrene-ethylene-butylene block copolymer (SEBS) with a molecular weight of Mn≈330000 in chloroform at a concentration of 5g / mL, stir at room temperature for 12 hours, and then add cross-linking N, N, N', N'-tetramethylethylenediamine (TMEDA), stirred at room temperature for 200 seconds to obtain a casting solution; the porous PE base film (PE, thickness 10 μm, porosity 45%, average pore diameter 0.1 ~0.3μm) on the peel-off polyester sheet, take a certain amount of casting liquid and spread it on the base film, and then cover the surface with a layer of peel-off polyester sheet to form a "sandwich" structure, and use the flat plate to drive out the air bubbles, And scrape it flat; sandwich the cast film plate with "sandwich" structure between graphite plates, place it on a 150°C hydraulic press for 1 hour, and press at a pressure of 3MPa. After removal, the membrane was peeled off from the polyester sheet to obtain the crosslinked and quaterniz...

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Abstract

The invention relates to an alkaline anion exchange membrane fuel cell, in particular to a preparation method of an ultrathin cross-linked composite enhanced polymer anion exchange membrane. Accordingto the method, a cheap ultrathin porous base membrane is adopted as a substrate in the membrane preparation process, polymerization crosslinking is thermally initiated in the membrane by adopting a one-step method, and the ultrathin cross-linked composite enhanced polymer anion exchange membrane is obtained after alkalization. The method is characterized in that an ultrathin polyethylene base membrane is used as a base membrane, and a one-step method is adopted to thermally initiate polymerization crosslinking in the membrane, so that the membrane preparation process is effectively simplified, and the computer rate and the dimensional stability of the membrane are improved. The method has the advantages that in the membrane forming process, crosslinking and quaternization are conducted atthe same time, the mechanical strength and the size stability of the crosslinked membrane are improved, and the quaternization efficiency is effectively improved. The cross-linked anion exchange membrane obtained by the invention has relatively high conductivity, excellent dimensional stability and chemical stability, and has a potential application prospect in alkaline anion exchange membrane fuel cells.

Description

technical field [0001] The invention belongs to the field of alkaline anion-exchange membrane fuel cells, and in particular relates to an ultra-thin cross-linked composite reinforced polymer anion-exchange membrane and a preparation method thereof. Background technique [0002] Alkaline membrane fuel cell (AEMFC) has the advantages of fast oxygen reduction kinetics, the use of non-platinum catalysts, low material corrosion resistance requirements, and low cost. Still need to improve urgently. This is because the current anion exchange membranes are mainly composed of different polymer skeletons grafted with cationic groups, and the cationic groups are mainly quaternary ammonium groups. [0003] Studies have found that there is a certain degree of contradiction between the ion exchange capacity and mechanical strength of this type of anion exchange membrane. For example, when the ion exchange capacity is too large and the water content is too high, the membrane is easy to be...

Claims

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Application Information

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IPC IPC(8): H01M8/1048H01M8/1072H01M8/1086
CPCH01M8/1048H01M8/1072H01M8/1093Y02E60/50
Inventor 郝金凯邵志刚张洪杰王朋豪
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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