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Comb structure high conductivity polybenzimidazole anion exchange membrane and preparation method thereof

An anion-exchange membrane and polybenzimidazole technology, applied in circuits, fuel cells, electrical components, etc., can solve problems such as rapid decline in conductivity, achieve increased conductivity, solve low conductivity, and promote micro The effect of phase separation

Active Publication Date: 2021-01-19
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

J.Membr.Sci.460, (2014) 160 functionalizes polybenzimidazole with a single imidazolium cation by using a side chain containing an ether bond. The prepared anion exchange membrane has good mechanical properties, but its conductivity is at 80 Only reach 27.2mS cm at ℃ -1 ; J.Membr.Sci.390-391, (2012) 152 The branch chain containing N-methylmorpholine ions was grafted on polybenzimidazole, and the conductivity of the prepared anion exchange membrane was only 2.9mS at 60°C cm -1
However, the natron-functionalized polybenzimidazole anion exchange membrane has the problem that the conductivity drops rapidly. The conductivity of the exchange membrane will change from 23mS cm within 100h -1 down to 10mS cm -1

Method used

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  • Comb structure high conductivity polybenzimidazole anion exchange membrane and preparation method thereof
  • Comb structure high conductivity polybenzimidazole anion exchange membrane and preparation method thereof
  • Comb structure high conductivity polybenzimidazole anion exchange membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1: Preparation of polybenzimidazole anion exchange membrane functionalized with quaternary ammonium ions containing ether bond branched chain comb structure

[0031]Synthesis of deprotonated comb-grafted polybenzimidazole material: Dissolve 1 g polybenzimidazole (OPBI) containing ether linkages (OPBI) in 100 ml DMAc, add 30 ml branched 1,2-bis( 2-Chloroethoxy)ethane and acid-binding agent 5gKOH, stirred and reacted at room temperature for 168h to produce a bright yellow liquid; the reaction solution was precipitated in water to obtain a light yellow solid, washed repeatedly with water and acetone for three times, and filtered in After drying in a vacuum oven at room temperature for 12 hours, a deprotonated comb-grafted polybenzimidazole material was obtained.

[0032] Preparation of comb-like high-conductivity polybenzimidazole anion-exchange membrane: Dissolve 0.1 g of deprotonated comb-like grafted polybenzimidazole material in 10 ml of DMSO, add 1 ml of 33% t...

Embodiment 2

[0035] Example 2: Preparation of polybenzimidazole anion-exchange membrane with imidazolium ion-functionalized branched chain comb-like structure containing ether bonds

[0036] Synthesis of deprotonated comb-like grafted polybenzimidazole material: Synthesis of deprotonated comb-like grafted polybenzimidazole material: 1g of polybenzimidazole (OPBI) containing ether linkages was dissolved in 50ml DMF, and 20ml Branched-chain 1,2-bis(2-chloroethoxy)ethane without cationic functional groups and acid-binding agent 2g NaH, stirred and reacted at -18°C for 100h until a bright yellow liquid was formed; the reaction solution was dissolved in acetone A pale yellow solid was obtained by precipitation in the mixture, and the precipitate was repeatedly washed with water and acetone three times, filtered and dried in a vacuum oven for 18 hours at room temperature to obtain a deprotonated comb-like grafted polybenzimidazole material.

[0037] A kind of preparation of polybenzimidazole ani...

Embodiment 3

[0039] Example 3: Preparation of polybenzimidazole anion exchange membrane with piperidinium ion-functionalized branched chain comb structure containing ether bonds

[0040] Synthesis of deprotonated comb-like grafted polybenzimidazole material: Synthesis of deprotonated comb-like grafted polybenzimidazole material: 1g of polybenzimidazole (OPBI) containing ether bonds was dissolved in 20ml NMP, and 30ml Branched-chain 1,2-bis(2-chloroethoxy)ethane without cationic functional groups and acid-binding agent 5g K 2 CO 3 , stirred and reacted at 100°C for 48 hours until a bright yellow liquid was produced; the reaction solution was precipitated in ethyl acetate to obtain a light yellow solid, washed repeatedly with water and acetone three times, filtered and dried in a vacuum oven for 24 hours to obtain deprotonated Comb-like grafted polybenzimidazole materials.

[0041] Preparation of a comb-like structure high conductivity polybenzimidazole anion exchange membrane: 0.3g deprot...

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Abstract

The invention belongs to the technical field of alkaline polymer electrolyte membranes, and relates to a comb-shaped high-conductivity polybenzimidazole anion exchange membrane and a preparation method thereof. In the present invention, firstly, polybenzimidazole is grafted with a branched chain that does not contain cationic functional groups to synthesize a deprotonated comb-like grafted polybenzimidazole material, so that the grafting rate reaches the maximum and polybenzoimidazole can be avoided. N-H in imidazole forms an acid-base pair with a cationic functional group, reducing its reactivity and mobility; then it reacts with a quaternization reagent to connect the branched chain end to a cationic functional group, making it easy to aggregate to form ions Clusters and hydrophilic / hydrophobic microphase separation structures. The anion exchange membrane prepared by the invention has excellent electrical conductivity, mechanical properties and alkali stability.

Description

technical field [0001] The invention belongs to the technical field of alkaline polymer electrolytes, and relates to a comb-shaped high-conductivity polybenzimidazole anion exchange membrane and a preparation method thereof. Background technique [0002] As global energy use grows, non-renewable energy sources such as fossil fuels will become increasingly depleted and have severe environmental impacts. As a country that consumes a lot of fossil energy, facing the environmental and energy crises, China urgently needs to develop fuel cell technology that can use clean fuels such as hydrogen and methanol without causing additional pollution. Anion-exchange membrane alkaline fuel cells have excellent performance and broad application prospects. The core component, anion-exchange membrane, directly affects the performance of fuel cells. However, compared with proton exchange membranes, anion exchange membranes at this stage have disadvantages such as low conductivity and poor al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/18H01M8/1067H01M8/1072
CPCH01M8/1067H01M8/1072C08G73/18Y02E60/50H01M8/103Y02P70/50H01M8/1081H01M8/1086
Inventor 吴雪梅贺高红王小舟李甜甜焉晓明刘嘉霏张扬张帆
Owner DALIAN UNIV OF TECH
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