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Acid and base combined polymer proton conductive film and preparation method thereof
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A technology of proton conductive membrane and composite polymer, which is applied in the field of polymer materials and electrochemistry, and can solve the problem of chronic loss of water vapor
Inactive Publication Date: 2010-06-16
TONGJI UNIV
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[0005] The present invention uses acidic polymers instead of small molecular acids to solve the problem of slow loss of acidic components along with the water vapor generated by the cathode during the use of fuel cells
Specifically, the method of in-situ polymerizing the monomers of one of the polymers in the presence of another polymer is used to prepare a composite proton conductive membrane, which solves the problem of compatibility of the two polymers and makes it difficult to mix them by blending. The problem
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Embodiment 1
[0033] The ratio of raw materials used is as follows:
[0039] Dissolve AA in water, then add P1VI, stir well, then add AIBA, stir well, pass nitrogen to remove oxygen, and react at 60°C for about 30 minutes. Pour the obtained solution on the polytetrafluoroethylene template, after automatic leveling, place it under an infrared lamp and bake for 12 hours, peel off the film, put it in a vacuum oven and dry it to obtain a dry composite film sample.
[0041] The composite impedance of the composite membrane was measured by an AC impedance meter (EG & G Princeton Applied Research Co.) equipped with a 273-type p...
Embodiment 2
[0043] The ratio of raw materials used is as follows:
[0045] 1 part of poly 4-vinylimidazole (P4VI) (number of moles of repeating units)
[0046] Azobisisobutylamidine hydrochloride (AIBA) 0.01 part (number of moles)
[0047] 15-75 parts of water (moles of water molecules)
[0048] The preparation method of composite membrane and the mensuration of proton conductivity are similar to embodiment 1, and its proton conductivity is as follows: figure 2 shown.
Embodiment 3
[0050] The ratio of raw materials used is as follows:
[0052] 1 part of poly-4-vinylpyridine (P4VPy) (number of moles of repeating units)
[0053]Azobisisobutylamidine hydrochloride (AIBA) 0.01 part (number of moles)
[0054] 15-75 parts of water (number of moles)
[0055] The preparation method of composite membrane and the mensuration of proton conductivity are similar to embodiment 1, and its proton conductivity is as follows: image 3 shown.
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Abstract
The invention belongs to the technical field of macromolecule material and electrochemistry, in particular to an acid-base polymerized substance proton conductive film and a process for preparation. The conductive film is prepared by the composition of an acid polymer and an alkaline polymer through an in-situ polymerization process. The introduction of the acid polymer solves a problem that inorganic small molecule acid is slowly leaked in water vapor environments, and the problem that two polymers can not be compounded to be equal stabilization material because of bad compatibility of the two polymers is solved through adopting the in-situ polymerization process. The proton conductive film material which is prepared has excellent film-forming properties, which has excellent protonconductivity in a mesophilic range.
Description
technical field [0001] The invention belongs to the technical field of polymer materials and electrochemistry, and in particular relates to a polymer non-aqueous proton conductive material used in electrochemical devices such as medium-temperature fuel cells and a preparation method thereof. Background technique [0002] Compared with the traditional room temperature PEMFC, the medium temperature (100-200 ℃) polymer electrolyte membrane fuel cell (PEMFC) has higher catalyst activity, higher allowable concentration of impurities such as CO, high fuel utilization rate, high battery energy density and battery The system has attracted much attention due to its simplicity and other advantages. At present, perfluorosulfonic acid membrane hydration membranes such as Nafion, which are commonly used in PEMFC, will lose their proton conductivity due to dehydration above 100 ° C, so they cannot be used in medium temperature PEMFC. [0003] The development of polymer non-aqueous proton...
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