Study On The Physiochemical Performance Of Anion Exchange Membranes Based On Poly(Phthalazinoner Ether Ketone)

Though PEMs, typically Nafion(?) membranes, exhibit excellent chemical, mechanical, thermal stabilities and high conductivity, the proton exchange membranes (PEM)-constructed fuel cells face significant barriers to commercialization, because of in acidic conditions, the choice of high activity, high stability, low methanol oxidation catalysts is limited and expensive, meanwhile the CO poisoning of non-reusable Pt and Pt-based electro catalysts at low temperature, high costs of membranes and catalysts, and high methanol permeability could decline the battery performance. As the strong acid exchange membrane limits, alkaline anion exchange membrane fuel cell(AAEMFC) research attracted much attention. Alkaline anion exchange membrane play a important role in AAEMFC, which provide hydroxyl ions for ion exchange from cathode to anode during electrochemical reactions and separate from the fuel and oxidation in alkaline fuel cells. Comparing to proton exchange membrane, the alkaline anion exchange can no, maintain high ionic conductivity and stability, which make it cannot meet the requirement of AAEMFC. The primary purpose of this research is to synthesis the cross-linked AAEM based on CMPPEK with the performance of high ionic conductivity and well stability, the physiochemical performance of the AAEM was evaluated in detail.In order to improve the mechanical properties and chemical stability of AAEM, N-methylimidazole and N,N-dimethylpiperazine were used as the composition agent of ammonium, the cross-linked alkaline anion exchange membranes were successfully synthesized via ammonium reaction, cast membrane, alkalization. The ammonium process was optimized, the chemical structure of AAEM was confirmed by FT-IR spectroscopy, the thermal stability was investigated by TGA, and the property of AAEM, including ionic conductivity, ionic exchange capacity, water uptake, swelling degree, mechanical properties, chemical stability were characterized in this study. The results showed that the conductivity of AAEM can reach at O.1S/cm at90℃, the swelling degree is18.26%, tensile strength is20.36Mp. and the degradation time in2M KOH is eleven days at60℃.The prepared AAEM also possesses very high thermal stability and solvent resistance.Triethylamine and N,N-dimethylpiperazine were used as the composition agent of ammonium, the cross-linked alkaline anion exchange membranes were successfully synthesized via pre-crosslink, cast membrane, ammonium.alkalization ea at. The preparation process was optimized, the chemical structure of AAEM was confirmed by FT-1R spectroscopy, the thermal stability was investigated by TGA, and the property of AAEM, including ionic conductivity, ionic exchange capacity, water uptake, swelling degree, mechanical properties, chemical stability were characterized in this study. The results showed that the ionic conductivity increase with increasing temperature and conductivity can reach at0.13S/cm at90℃The optimal properties of AAEM is28.73%(water uptake), the tensile strength is far higher than Nafion-115, which can reach at54.57Mpa. The prepared AAEM also possesses very high physiochemical performance. All these properties indicate that the AAEM prepared in this article is very promising for potential applications in alkaline anion exchange membrane.