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A branched side chain polymer anion exchange membrane and preparation method thereof

An anion exchange membrane and polymer technology, applied in the field of branched side chain polymer anion exchange membrane and its preparation, can solve the problem of low controllability of alkyl side chain length, decreased solubility, main chain and side chain entanglement and other issues, to achieve the effect of taking into account the conductivity-stability and high chemical reactivity

Inactive Publication Date: 2019-05-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the controllability of the length of the synthesized alkyl side chain is very low. If the length is too large, the main chain and the side chain will be entangled, which will reduce the solubility of the polymer in organic solvents; Watanabe et al. Introduce bisphenol fluorene structure into polyether sulfone ketone block polymer, at 30°C, the conductivity is 50mS / cm (IEC=2.54meq.g-1), and at 80°C and 60%RH (relative humidity) , the maximum stress is 48 MPa, maintaining good mechanical properties [Masahiro Watanabe, et al,.Polym.Chem.2011,2,99-106]

Method used

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  • A branched side chain polymer anion exchange membrane and preparation method thereof
  • A branched side chain polymer anion exchange membrane and preparation method thereof
  • A branched side chain polymer anion exchange membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment example 1

[0030]Synthesis of chloromethylated polysulfone (CMPSf): under nitrogen protection, 7 g of polysulfone was dissolved in chloroform, and 420 μl of SnCl was added dropwise 4 , and then slowly add 11.9 ml of chloromethyl methyl ether with a syringe; react at 55°C for 10 hours, after the reaction, precipitate the mixture in ethanol, filter it with suction, soak it in ethanol and stir for 12 hours, filter it with suction, and use it several times After washing with deionized water and ethanol, the resulting white precipitate was vacuum-dried at 60°C for 24 hours. The degree of chloromethylation (DCM) of the obtained product was 0.77.

[0031] Ionization of chloromethylated polysulfone (CMPSf): Take 1 mole part of CMPSf dissolved in 25 mole parts of DMAC, add 1 mole part of 1-methylimidazole (MIm), and react at 60°C for 6h.

[0032] Membrane casting: cast the above reaction solution on a clean glass plate, flow to form a membrane, and dry at 60°C for 18 hours to obtain an anion mem...

Embodiment example 2

[0035] Synthesis of chloromethylated polysulfone (CMPSf): under nitrogen protection, 7 g of polysulfone was dissolved in chloroform, and 420 μl of SnCl was added dropwise 4 , and then slowly add 11.9 ml of chloromethyl methyl ether with a syringe; react at 55°C for 10 hours, after the reaction, precipitate the mixture in ethanol, filter it with suction, soak it in ethanol and stir for 12 hours, filter it with suction, and use it several times After washing with deionized water and ethanol, the resulting white precipitate was vacuum-dried at 60°C for 24 hours. The degree of chloromethylation (DCM) of the obtained product was 0.77.

[0036] Synthesis of branched side chain polymer (BPSf) by ATRP reaction: Weigh about 0.6g of CMPSf with DCM=77%, and NMP (10ml) as solvent, dissolve in a four-necked bottle, in order to ensure nitrogen protection environment, nitrogen gas-pump After vacuum-nitrogen circulation for 3 to 5 times, quickly add 0.02g of cuprous chloride (CuCl) and 0.09g...

Embodiment example 3

[0041] Synthesis of chloromethylated polysulfone (CMPSf): under nitrogen protection, 7 g of polysulfone was dissolved in chloroform, and 420 μl of SnCl was added dropwise 4 , and then slowly add 11.9 ml of chloromethyl methyl ether with a syringe; react at 55°C for 10 hours, after the reaction, precipitate the mixture in ethanol, filter it with suction, soak it in ethanol and stir for 12 hours, filter it with suction, and use it several times After washing with deionized water and ethanol, the resulting white precipitate was vacuum-dried at 60°C for 24 hours. The degree of chloromethylation (DCM) of the obtained product was 0.77.

[0042] Synthesis of branched side chain polymer (BPSf) by ATRP reaction: Weigh about 0.6g of CMPSf with DCM=77%, NMP (13ml) as solvent, dissolve in a four-necked bottle, in order to ensure nitrogen protection of the environment, nitrogen-pumping After vacuum-nitrogen circulation for 3 to 5 times, quickly add 0.05g of cuprous chloride (CuCl) and 0.2...

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Abstract

The invention discloses a branched polymer anion exchange membrane and a preparation method thereof. The preparation of the membrane material is based on the use of chloromethylated polysulfone as a macromolecular initiator and p-chloromethylstyrene as a monomer, and a series of polymers containing branched side chain structures are synthesized by using ATRP reaction. Utilizing its abundant and highly reactive end group, the basic anion exchange membrane with low chloromethylation degree and high conductivity can be prepared through post-treatment; in addition, by adjusting the degree of branching of the side chain, it can be used in Different degrees of microphase separation are formed in the membrane to achieve the goal of taking into account the conductivity-stability of the anion exchange membrane. The anionic membrane prepared by the invention has strong structure adjustability, high electrical conductivity of the membrane and good self-swelling resistance, and is of great significance for the research on the electrical conductivity and stability of the balanced membrane.

Description

technical field [0001] The invention belongs to the field of fuel cell membrane materials, and relates to a branched side chain polymer anion exchange membrane and a preparation method thereof. Background technique [0002] With the continuous development of global industry, the human demand for energy continues to grow, and the long-term dependence on the energy supply form of traditional fossil fuel combustion has caused a series of environmental pollution, energy shortage and other problems. The fuel cell technology uses electrochemical reactions to convert the chemical energy stored in the fuel into electrical energy. As a new energy technology, it has received a lot of attention. Among them, the alkaline anion exchange membrane fuel cell (AAEMFC) has been studied by many scholars because of its low oxygen reduction overpotential, fast electrode reaction kinetics, the use of non-noble metals as catalysts, no carbonate crystallization, and low fuel permeability. hotspots...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/00C08F212/14C08F8/44C08G75/20H01M8/0239H01M2/16H01M50/411
CPCH01M8/02C08F8/44C08F283/002C08G75/20H01M50/411C08F212/14Y02E60/50Y02E60/10
Inventor 张凤祥李姗姗刘燕祥甘瑞君张奎博
Owner DALIAN UNIV OF TECH
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