Ionomeric membrane
An ionomer membrane and ionomer technology, applied in the field of ionomer membranes, can solve problems such as limited duration
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Problems solved by technology
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Examples
Embodiment 1
[0109] SO 3 H-type ionomer preparation
[0110] In a 22-liter autoclave, the following reactants were introduced:
[0111] - 11.5 liters of demineralized water;
[0112] -980g type CF 2 = CF-O-CF 2 CF 2 -SO 2 F monomer;
[0113] -3,100g 5wt% an aqueous solution of fluoropolyoxyalkylene having the following formula, having acid end groups, number average molecular weight 521, and forming potassium salt:
[0114] CF 2 ClO(CF 2 CF(CF 3 )O) n (CF 2 O) m CF 2 COOK
[0115] In the formula, n / m=10.
[0116] The autoclave was heated to 60°C with stirring maintained at 540 rpm. Then, 225 mL of an aqueous potassium persulfate (KPS) solution having a concentration of 6 g / L was fed into the autoclave. The pressure was raised to 1.3 MPa absolute by introducing TFE. The reaction started after 4 minutes. The pressure was maintained at 1.3 MPa absolute by feeding TFE. After feeding 1,000 g of TFE into the reactor, 175 g of CF 2 = CF-O-CF 2 CF 2 -SO 2 F's sulfonic acid ...
Embodiment 2
[0121] Preparation of ionomer dispersion
[0122] An 8.6 wt% dispersion of the sulfonic acid ionomer obtained in Example 1 was prepared by dissolving 18.8 g of the ionomer in 200 g of a quaternary mixture consisting of: 39 g H 2 O, 80g of isopropanol, 80g of n-propanol, and 1g of fluoropolyoxyalkylene with a boiling point in the range of 80°C to 120°C, a number average molecular weight equal to 350, and the following formula:
[0123] CF 2 H-O(CF 2 CF 2 O) m (CF 2 O) n -CF 2 h
[0124] The dissolution was carried out in a glass vessel equipped with a mechanical stirrer at room temperature for 24 hours.
[0125] At the end, the dispersion was treated with Synehro Electric The Brookfield viscosity measured by the LVT type viscometer at 25°C with No. 4 spindle at 60rpm is 1000cP.
Embodiment 3
[0127] Preparation of ionomer membrane
[0128] The ionomer membrane was prepared as follows: On a Kapton support having a thickness of 50 μm, a strip of the dispersion prepared in Example 2 was deposited with a length of approximately 10 cm. With the help of a layered Braive set at a knife height of 700 μm With a knife, scrape the dispersion to form a continuous layer. Dry in a 65°C oven for 30 minutes to evaporate most of the solvent. This forms a crude ionomer membrane on a Kapton support.
[0129] The annealing step was performed by transferring the film on the Kapton support to a 150°C oven for 3.5 hours. When complete, it was removed from the oven and the Kapton support was removed from the ionomer membrane by dipping in water. The film was then cut to obtain sheets with dimensions of 12 cm x 20 cm.
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