Phosphoric-acid-doped cross-linked polybenzimidazole high-temperature proton exchange membrane and preparation method thereof

Abstract

The invention relates to a phosphoric-acid-doped cross-linked polybenzimidazole high-temperature proton exchange membrane and a preparation method thereof, and belongs to the technical field of special polymer functional membranes. The preparation method comprises the steps of dissolving polybenzimidazole and hyperbranched polymer poly(p-chloromethyl styrene) in an organic solvent according to a certain ratio; then adding a hyperbranched polymer solution into a polybenzimidazole solution; fully mixing and filtering a mixed solution, and then pouring the mixed solution on a clean glass plate toform a film; and then carrying out drying after soaking in a phosphoric acid solution at a certain temperature for a certain time. The hyperbranched polymer rich in chlorine atoms is used as a cross-linking agent, the cross-linking degree can be adjusted by adjusting the percentage of the branched polymer in an imidazole group, and a three-dimensional net structure is formed in the film forming process; and meanwhile, the residual chlorine atoms in the cross-linking reaction can be converted into functional groups beneficial to proton conduction. The phosphoric-acid-doped cross-linked polybenzimidazole high-temperature proton exchange membrane prepared by the method has excellent mechanical strength and proton conduction capability and can be used for a high-temperature proton exchange membrane fuel cell.

Description

technical field

[0001] The invention belongs to the technical field of special polymer functional membranes, and in particular relates to a phosphoric acid-doped cross-linked polybenzimidazole high-temperature proton exchange membrane and a preparation method thereof. Background technique

[0002] Fuel cells were initially successfully used in special fields such as aerospace. In recent years, with the rapid development of economy and technology, a series of problems such as energy depletion and environmental degradation have been brought about. As a green and environmentally friendly fuel cell technology, it has begun to receive domestic and foreign attention. Widespread attention. A fuel cell is a highly efficient device that converts chemical energy, such as hydrogen, into electricity. As a kind of fuel cell, Proton Exchange Membrane Fuel Cell (PEMFC) does not produce harmful substances in the chemical reaction process, only discharges a small amount of water, and has ma...

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