Polymer electrolyte membrane having high durability and method for producing the same
a polymer electrolyte and durability technology, applied in the direction of non-metal conductors, cell components, conductors, etc., can solve the problems of inability to obtain high-voltage electricity, unsatisfactory durability of conventional proton exchange membranes, and none of these methods can solve the above-mentioned problems, and achieve excellent properties and high durability
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
Problems solved by technology
Method used
Image
Examples
example 1
[0179]A polymer electrolyte membrane having a Nafion / PBI weight ratio of 97.5 / 2.5, an ion exchange capacity of 0.77 milliequivalent / g and a thickness of 50 μm was produced as follows.
[0180]A 5% by weight Nafion solution (containing Nafion™ / H2O / isopropanol) (manufactured and sold by Solution Technology, Inc., U.S.A) was used as preliminary solution C1. Nafion had an equivalent weight value (EW) of 1,100, wherein EW is a dry weight (g) per equivalent of a proton exchange group. On the other hand, dimethylacetamide (hereinafter referred to as “DMAC”) was added to a 5% by weight Nafion solution (which was the same as preliminary solution C1), and the resultant mixture was refluxed at 120° C. for 1 hour, followed by vacuum concentration by means of an evaporator, thereby obtaining preliminary solution B1 having a Nafion / DMAC weight ratio of 1.5 / 98.5.
[0181]Poly[2,2′-(m-phenylene)-5,5′-bibenzimidazole] having a weight average molecular weight of 27,000 (manufactured and sold by Sigma-Aldri...
example 2
[0198]A polymer electrolyte membrane having a PFS / PBI weight ratio of 99.0 / 1.0, an ion exchange capacity of 1.25 milliequivalents / g and a thickness of 49 μm was produced as follows, using as a fluorinated polymer electrolyte, a perfluorosulfonic acid polymer (hereinafter referred to as “PFS”) represented by the following formula:
[CF2CF2]0.812—[CF2—CF(—O—(CF2)2—SO3H)]0.188).
[0199]A perfluorocarbon polymer (MI: 3.0) of tetrafluoroethylene and CF2═CFO(CF2)2—SO2F was produced as a precursor polymer for PFS. The produced precursor polymer was added to an aqueous solution of potassium hydroxide (15% by weight) and dimethylsulfoxide (30% by weight), and the precursor polymer was contacted with the aqueous solution at 60° C. for 4 hours, thereby performing a hydrolysis treatment. Then, the precursor polymer was immersed in water having a temperature of 60° C. for 4 hours. Subsequently, the precursor polymer was immersed in an aqueous 2N hydrochloric acid solution having a temperature of 60°...
example 3
[0206]Using the same fluorinated polymer electrolyte (namely PFS) and same preliminary solutions A1, B2 and C2 as used in Example 2, a polymer electrolyte membrane having a PFS / PBI weight ratio of 98.1 / 1.9, an ion exchange capacity of 1.14 milliequivalents / g and a thickness of 51 μm was produced as follows.
[0207]6.5 g of preliminary solution A1 was added to 40.0 g of preliminary solution B2, followed by stirring. To the resultant was added 32.4 g of preliminary solution C2, followed by stirring. The resultant mixture was subjected to vacuum concentration at 80° C., thereby obtaining a casting liquid. The obtained casting liquid had a PFS concentration of 5.6% by weight and a PBI concentration of 0.11% by weight.
[0208]Using the casting liquid, the polymer electrolyte membrane of the present invention was produced in the same manner as in Example 2. The produced membrane was uniformly pale yellow but had high transparency. The haze value of the membrane was 3.2% (H50=3.1%). Further, a...
PUM
| Property | Measurement | Unit |
|---|---|---|
| relative humidity | aaaaa | aaaaa |
| operating temperature | aaaaa | aaaaa |
| operating temperature | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More