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Long-branched-chain polysulfone anionic membrane and preparation method thereof

An anion exchange membrane and long-chain branched technology, which is applied in the field of long-chain branched polysulfone anion membrane and its preparation, can solve the problems of reduced mechanical properties of the membrane and increased water absorption, so as to reduce swelling, improve connectivity, and enhance phase The effect of separation drive

Active Publication Date: 2015-09-02
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the increase of functional groups, the water absorption rate will inevitably increase, and the mechanical properties of the membrane will decrease with the increase of water content.

Method used

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  • Long-branched-chain polysulfone anionic membrane and preparation method thereof
  • Long-branched-chain polysulfone anionic membrane and preparation method thereof
  • Long-branched-chain polysulfone anionic membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Because the acylation reaction requires anhydrous reaction, various flasks and other instruments need to be vacuumed under double-row tubes before the experiment. When vacuuming, the flask should be burned with an alcohol lamp. After the burning is stopped, vacuum should be drawn until the flask is cooled. Pour in inert gas such as nitrogen, and then vacuum, repeat 2-3 times in this way, and then add 1g PSF solid and 40ml dichloromethane (put into active molecular sieve one week in advance) to dissolve at room temperature under nitrogen protection. After dissolving, add 2ml of anhydrous tin tetrachloride, then place the reaction in an ice-water bath, 15 minutes later when the temperature drops to 3℃, mix 1ml of acylating reagent 3-bromopropionyl chloride with 10ml of dichloromethane In the normal pressure dropping funnel, under the protection of nitrogen, slowly drip the reaction liquid. Because the acylation reaction will emit hydrogen chloride gas, a bubbler is connect...

Embodiment 2

[0030] The flask was evacuated under a double-row tube, and then under the protection of nitrogen, 1g PSF solid and 40ml dichloromethane (put into the active molecular sieve one week in advance) were added to dissolve at room temperature. After dissolving, add 2ml of anhydrous tin tetrachloride, and then place the reaction in an ice-water bath. After 15 minutes, when the temperature drops to 3℃, mix 1ml of acylation reagent 6-bromohexanoyl chloride with 10ml of dichloromethane. In the normal pressure dropping funnel, under the protection of nitrogen, slowly drip the reaction liquid. Because the acylation reaction will emit hydrogen chloride gas, a bubbler is connected to the other outlet of the flask while dripping, and then a rubber tube is connected to the water to absorb the gas generated by the reaction and ensure that the pressure in the flask is moderate. The dripping is completed for 20 minutes. Then the ice water bath was removed, and the reaction was allowed to react ...

Embodiment 3

[0038] The flask was evacuated under a double-row tube, and then under nitrogen protection, 0.5 g of PSF solid and 15 ml of dichloromethane (put into the active molecular sieve one week in advance) were added to dissolve at room temperature. After dissolving, add 2ml of anhydrous tin tetrachloride, and then place the reaction in an ice water bath. After 15 minutes, when the temperature drops to 3℃, mix 2ml of acylating reagent 6-bromohexanoyl chloride with 10ml of dichloromethane. In the normal pressure dropping funnel, under the protection of nitrogen, slowly drip the reaction liquid. Because the acylation reaction will emit hydrogen chloride gas, a bubbler is connected to the other outlet of the flask while dripping, and then a rubber tube is connected to the water to absorb the gas generated by the reaction and ensure that the pressure in the flask is moderate. The dripping is completed for 20 minutes. Then the ice water bath was removed, and the reaction was allowed to rea...

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Abstract

The invention discloses a long-branched-chain polysulfone anionic membrane and a preparation method thereof. The structure of the membrane material is disclosed in the specification. The preparation method comprises the following steps: polysulfone acylation, carbonyl reduction, quaternization, film formation, alkalification and the like. Compared with the traditional anion-exchange membrane sequentially subjected to quaternization and functionalization, the polysulfone anion-exchange membrane contains the long branched chain on the side chain, so that the hydrophilic group is far away from the hydrophobic polymer main chain, thereby enhancing the phase separation driving force in the film formation process, improving the connectivity of the ion channels in the membrane and further enhancing the hydroxide ion conductivity of the membrane. The long alkyl side chain can obviously reduce the degree of swelling of the quaternary ammonium salt membrane and reduce the nucleophilic attack of water or OH-. The long-branched-chain polysulfone anionic membrane can obtain higher ion conductivity on the premise of relatively lower water absorptivity, thereby solving the contradiction in the anionic membrane for a long time.

Description

Technical field [0001] The invention belongs to the technical field of basic anion exchange membranes, and relates to a long-chain branched polysulfone anion membrane and a preparation method thereof. Background technique [0002] As environmental pollution becomes more and more serious, fuel cells have entered people’s eyes as a new, green and efficient chemical energy source. Proton exchange membrane fuel cells have become a research subject due to their high energy conversion rate, environmental friendliness, and rapid start-up. One of the most mature fuel cells. However, its expensive noble metal catalysts have also become a key constraint to its inability to commercialize on a large scale. Compared with proton exchange membrane fuel cells, alkaline fuel cells have fast fuel oxidation and reduced methanol permeability. The main advantage is that they can use non-noble metals such as Mn and Co as electrocatalysts, reducing their production costs. [0003] The common method of ...

Claims

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Application Information

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IPC IPC(8): C08G75/20C08J5/22H01M2/16H01M8/02
CPCY02E60/50
Inventor 焉晓明胡玉涛贺高红阮雪华郑文姬曾薇潘昱
Owner DALIAN UNIV OF TECH
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