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

An anion exchange membrane, polybenzimidazole technology, applied in circuits, fuel cells, electrical components, etc., can solve the problem of rapid decline in electrical conductivity, achieve improved electrical conductivity, excellent electrical conductivity, and promote microphase separation in the membrane Effect

Active Publication Date: 2019-08-09
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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

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Example Embodiment

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

[0031] Synthesis of deprotonated comb-shaped grafted polybenzimidazole material: Dissolve 1g of polybenzimidazole containing ether bonds (OPBI) in 100ml DMAc, and add 30ml of branched 1,2-bis( without cationic functional groups) 2-Chloroethoxy) ethane and acid binding agent 5gKOH were stirred and reacted at room temperature for 168h until a bright yellow liquid was formed; the reaction liquid was precipitated in water to obtain a pale yellow solid, and the precipitate was washed with water and acetone repeatedly for three times. After 12 hours of drying at room temperature in a vacuum oven, a deprotonated comb-shaped grafted polybenzimidazole material was obtained.

[0032] Preparation of comb-like structure and high conductivity polybenzimidazole anion exchange membrane: 0.1g of deprotonated comb-like grafted polybenzimid...

Example Embodiment

[0035] Example 2: Preparation of imidazole ion-functionalized polybenzimidazole anion exchange membrane containing ether bond branched comb structure

[0036] Synthesis of deprotonated comb-shaped grafted polybenzimidazole material: Synthesis of deprotonated comb-shaped grafted polybenzimidazole material: Dissolve 1g of ether bond-containing polybenzimidazole (OPBI) in 50ml DMF and add 20ml Branched 1,2-bis(2-chloroethoxy)ethane without cationic functional groups and acid binding agent 2g NaH, stirred and reacted at -18℃ for 100h until a bright yellow liquid was formed; the reaction solution was placed in acetone A light yellow solid was obtained by precipitation, and the precipitate was washed three times with water and acetone. After filtration, it was dried in a vacuum oven at room temperature for 18 hours to obtain a deprotonated comb-shaped grafted polybenzimidazole material.

[0037] Preparation of a comb-like structure and high conductivity polybenzimidazole anion exchange m...

Example Embodiment

[0039] Example 3: Preparation of a polybenzimidazole anion exchange membrane with a branched comb structure containing ether bonds and a piperidine ion functionalized polybenzimidazole

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

[0041] Preparation of a comb-like structure and high conductivity p...

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Abstract

The invention belongs to the technical field of alkaline polymer electrolyte membranes, and relates to a comb structure high-conductivity polybenzimidazole anion exchange membrane and a preparation method thereof. The method comprises the steps of firstly, subjecting the polybenzimidazole and a branch having no cationic functional group to a grafting reaction so as to synthesize a deprotonated comb-like grafted polybenzimidazole material, thereby maximizing the grafting ratio and preventing the N-H in the polybenzimidazole from forming an acid-base pair with the cationic functional group and further reducing its reactivity and activity; and then reacting the deprotonated comb-like grafted polybenzimidazole material with a quaternization agent to connect the tail end of the branch to the cationic functional group to form an ion cluster which is easy to aggregate and a hydrophilic/hydrophobic microphase separation structure. The anion exchange membrane prepared by the method has excellent electrical conductivity, mechanical property 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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IPC IPC(8): H01M8/1067H01M8/1072C08G73/18
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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