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Alkaline polymer electrolyte membrane and preparation and application thereof

An electrolyte membrane and polymer technology, applied in circuits, fuel cells, electrical components, etc., can solve the problems of limited alkali resistance stability, decreased membrane conductivity, etc., and achieve easy functionalization, slow degradation, and simple preparation process. Effect

Pending Publication Date: 2022-06-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the literature, the chemical structure design of its functional groups is used to improve the alkali resistance stability of alkaline polymer electrolyte membranes. For example, long alkyl chains are introduced into the most commonly used benzyltrimethylammonium ions to weaken the positive charge of the central nitrogen atom. , but the alkali-resistant stability of such functional groups is still limited; another example is the use of piperidinium ions as functional groups, but piperidinium ions can undergo ring-opening reactions under alkaline conditions, resulting in a decrease in membrane conductivity

Method used

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  • Alkaline polymer electrolyte membrane and preparation and application thereof
  • Alkaline polymer electrolyte membrane and preparation and application thereof
  • Alkaline polymer electrolyte membrane and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Preparation of main chain polymer PAP-BP-80 containing piperidine group

[0050] In a 100ml round bottom flask were added dichloromethane (25ml), N-methyl-4-piperidone (3.31g, 0.0293mol), 2,2,2-trifluoroacetophenone (0.508g, 0.0029mol) , biphenyl (5.6338g, 0.0366mol), mechanical stirring to dissolve. Trifluoroacetic acid (2ml, about 0.0269mol) and trifluoromethanesulfonic acid (25ml, about 0.2825mol) were added dropwise at 0°C, the acid drop rate was controlled at 0.5mL / min, and 2,2 was added for the second time after 30min. , 2-Trifluoroacetophenone (0.635g, 0.0037mol) was reacted at 0°C for 2h and then 2,2,2-trifluoroacetophenone (0.127g, 0.0007mol) was added for the third time, and then continued at 0 Reaction 24 at °C gave a viscous solution. Pour the solution into NaOH / ethanol solution (mass concentration is 0.2g / ml, consumption is 500ml) to separate out the polymer, separate solid, dissolve with tetrahydrofuran (consumption is 500-ml), in ethanol (consumptio...

Embodiment 2

[0060] The same reaction conditions as in Example 1 were used, except that the difference from Example 1 was that the substance ratio of N-methyl-4-piperidone and 2,2,2-trifluoroacetophenone was changed by 60% : The ratio of 40% is charged (the sum of the amount of their substances is unchanged) to prepare the main chain polymer PAP-BP-60 containing piperidine groups, and the target OH-type alkaline polymer electrolyte membrane PAP-BP is obtained after functionalization -60-4, the conductivity of the membrane is 30mS cm at 25°C -1 .

Embodiment 3

[0062] Using the same reaction conditions and reaction materials as in Example 1, the piperidine group-containing backbone polymer PAP-BP-80 was obtained. The difference from Example 1 is that the target polymer PAP-BP-80-6 is prepared by functionalization with (6-bromobutyl) trimethylammonium bromide. After the membrane was prepared by the solvent evaporation method, the conductivity of the membrane after substitution into OH type was 31mS cm -1 .

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Abstract

The invention discloses an alkaline polymer electrolyte membrane and preparation and application thereof, the designability of a polymer molecular chain is utilized, a main chain does not contain an electron withdrawing group and simultaneously contains a hydrophobic segment and a hydrophilic segment, a microscopic phase separation structure is established, functional groups are limited to the hydrophilic segment, water molecules perform cation solvation on the functional groups, and meanwhile, the functional groups are separated from the hydrophobic segment. No electron withdrawing group exists around quaternary ammonium ions introduced to a side chain, chemical degradation of functional groups is slowed down, and the ion transmission capacity of the alkaline membrane is guaranteed. The polymer prepared by the method is simple in preparation process and can be applied to electrochemical devices such as alkaline polymer electrolyte membrane fuel cells, alkaline polymer electrolyte membrane water electrolysis, electrodialysis and zinc air cells.

Description

technical field [0001] The invention belongs to the field of alkaline polymer electrolyte membranes, in particular to an alkaline polymer electrolyte membrane with high chemical stability and a preparation method thereof. Background technique [0002] Alkaline polymer electrolyte membranes can be applied to electrochemical devices such as fuel cells and water electrolysis. The performance and stability of alkaline membranes are one of the prerequisites for the application of devices. At present, the alkali-resistant chemical stability of alkaline polymer electrolyte membranes is still insufficient. Among them, the functional group is easily attacked by hydroxide ions due to positive charge, and bimolecular nucleophilic substitution reaction or Hofmann elimination reaction occurs, which makes the electrolyte membrane lose its ability to conduct ions. In the literature, the chemical structure design of its functional groups is used to improve the alkali resistance stability o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/14C08J5/18C08L65/00C08L71/10C08G61/02C08G65/48C08G65/40H01M8/103H01M8/1032H01M8/1088
CPCC08J7/14C08J5/18C08G61/02C08G65/48C08G65/4006H01M8/103H01M8/1032H01M8/1088C08J2371/10C08J2365/00C08G2261/122C08G2261/143C08G2261/146C08G2261/228C08G2261/312C08G2261/3221C08G2261/3326C08G2261/354
Inventor 王素力李晋源孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI