Branched block comb-type polyether sulfone as well as preparation method and application thereof
A polyaryl ether sulfone, comb-type technology is applied in the field of anion exchange membrane fuel cells, which can solve the problems of ionic conductivity and alkali stability that cannot meet the application requirements of high-performance fuel cells, and achieve excellent ionic conductivity and alkali stability. , to meet the high-performance effect
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[0050] The embodiment of the present invention provides the preparation method of the branched block comb polyaryl ether sulfone, comprising: the first hydroxyl-containing branched block polyaryl ether sulfone represented by formula IV and bromoalkylimidazolium salt reaction to obtain the branched block comb polyaryl ether sulfone shown in formula I; or, the second hydroxyl-containing branched block polyaryl ether sulfone shown in formula V is reacted with the bromoalkylimidazolium salt, Obtain the branched block comb polyaryl ether sulfone shown in formula II;
[0051] The bromoalkylimidazolium salt has a structure of formula VI; wherein, m and n are independently selected from integers ranging from 1 to 200; x is selected from integers ranging from 2 to 16;
[0052]
[0053]
[0054] The method provided in the embodiment of the present invention prepares a high-performance branched block comb polymer anion exchange membrane material, and the method is simple and easy t...
Embodiment 1
[0083] The synthesis of embodiment 1 imidazolium bromide
[0084] As shown in Formula B, 1,6-dibromohexane (250mmol, 61.0g) was added into a 250mL three-necked flask containing a condensing reflux device and a constant pressure dropping funnel, and 1-methylimidazole (50mmol, 4.1g) and 50 mL of acetone were added to a constant pressure dropping funnel, slowly dropped into a three-neck flask and stirred evenly, and the reaction temperature was 40° C., and the reaction was carried out in a nitrogen atmosphere for 15 hours. When the reaction was terminated, the solution was filtered, the filtrate was taken, and the acetone solution with a low boiling point was removed by rotary evaporation of the filtrate, then the light yellow liquid after the rotary evaporation was poured into a 500mL extraction bottle, extracted three times with ethyl acetate and ether solvent respectively, and the The light yellow oily liquid was dried in a vacuum oven at 50°C for 24 hours to obtain the bromoa...
Embodiment 2
[0086] The synthesis of embodiment 2 polymer B1-HBPES
[0087] 1. As shown in the formula A-1, first synthesize the prepolymer PB1 (also known as oligomer), and then synthesize the block polyarylethersulfone copolymer B1-MBPES with methoxy groups, the degree of branching is 6%. Add bisphenol AF (1.0087g, 3mmol), difluorosulfone (0.7626g, 3mmol), 0.6g potassium carbonate, 8mL DMAc and 6mL toluene into a 100mL three-neck flask equipped with a Dean-stark trap under nitrogen protection Stir evenly, react at 140°C for 12h, and obtain a substance containing prepolymer PB1 (see the PB1 detection spectrum figure 2 ). Then, the branched monomer B 3 (0.2434g, 0.3mmol), difluorosulfone (0.3940g, 1.55mmol), 2mmol DMHF and 0.6g potassium carbonate were added to the above reactor, while adding hot toluene (6mL) and DMAc (4mL) mixed solution, Continue to react at 140°C for 2 hours, then raise the temperature to 170°C for reaction, remove the water separator, and terminate the reaction wh...
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