A kind of long-chain branched polyphenylene ether anionic membrane and preparation method thereof
An anion membrane and polyphenylene ether technology, which is applied in the field of long-chain branched polyphenylene ether anion exchange membrane and its preparation, can solve the problem of being unable to meet the requirements of long-term use of alkaline fuel cells, prone to degradation, and lack of benzylic quaternary ammonium groups. Stability and other issues, to achieve the effect of improving OH-conductivity, good mobility, and improving alkali resistance stability
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Embodiment 1
[0046] Preparation of acylated polyphenylene ether: under nitrogen protection, dissolve 2.4g polyphenylene ether in 70mL dichloroethane, add 1.61g aluminum trichloride, add 1.3mL p-fluorobenzoyl chloride drop by drop, at 60°C After reacting for 6 hours, add excess methanol, filter, wash with methanol, dry and reprecipitate with chloroform, and vacuum dry at 60°C to obtain acylated polyphenylene ether.
[0047] Condensation reaction: under nitrogen protection, dissolve 2 g of the acylated polyphenylene ether obtained above in 30 mL of N,N-dimethylacetamide, add 1.5 times the molar amount of p-hydroxyphenethyl alcohol, and 2.5 times the molar amount of anhydrous potassium carbonate, Then add 15mL of toluene, after azeotropic dehydration at 135°C for 4h, evaporate the dehydrating agent, then react at 150°C for 5h, add excess ethanol, wash, and dry to obtain a long-chain hydroxyl-containing polymer.
[0048] Hydroxyl bromide: Under nitrogen protection, dissolve 0.3g of a polymer c...
Embodiment 2
[0055] Preparation of acylated polyphenylene ether: under nitrogen protection, dissolve 2.4g polyphenylene ether in 70mL dichloroethane, add 1.90g aluminum trichloride, add 1.43mL p-fluorobenzoyl chloride drop by drop, at 60°C After reacting for 6 hours, add excess methanol, filter, wash with methanol, dry and reprecipitate with chloroform, and vacuum dry at 60°C to obtain acylated polyphenylene ether.
[0056] Condensation reaction: with embodiment 1
[0057] Hydroxyl bromide: with embodiment 1
[0058] Preparation of long-chain branched polyphenylene ether anion exchange membrane: same as Example 1
[0059] Tests show that the water content of the long-chain branched polyphenylene ether anion exchange membrane prepared in this example is 37%, and the ion conductivity is 18mS cm -1 , its anion exchange capacity is 1.51mmol.g -1 , the tensile strength is 16.7 MPa, which shows that the homogeneous anion exchange membrane prepared in this example has less swelling, has suitab...
Embodiment 3
[0061] Preparation of acylated polyphenylene ether: under nitrogen protection, dissolve 2.4g polyphenylene ether in 70mL dichloroethane, add 2.88g aluminum trichloride, add 2.2mL p-fluorobenzoyl chloride drop by drop, at 60°C After reacting for 6 hours, add excess methanol, filter, wash with methanol, dry and reprecipitate with chloroform, and vacuum dry at 60°C to obtain acylated polyphenylene ether.
[0062] Condensation reaction: with embodiment 1
[0063] Hydroxyl bromide: with embodiment 1
[0064] Preparation of long-chain branched polyphenylene ether anion exchange membrane: same as Example 1
[0065] Tests have shown that the long-chain branched polyphenylene ether anion exchange membrane prepared in this example has a water content of 50% and an ion conductivity of 32 mS cm -1 , its anion exchange capacity is 1.69mmol.g -1 , the tensile strength is 15.8 MPa, which shows that the homogeneous anion exchange membrane prepared in this example has less swelling, has sui...
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