Soft phase macromolecule/polyimide gradient type composite nanometer fiber membrane and preparation method thereof

The invention discloses a soft phase macromolecule/polyimide gradient type composite nanometer fiber membrane and a preparation method thereof. The soft phase macromolecule/polyimide gradient type composite nanometer fiber membrane comprises an obverse membrane, a middle inner layer and a reverse membrane, which are sequentially arranged from the top down, wherein the middle inner layer is formed by polyimide nanometer fibers, or the polyimide nanometer fibers and soft phase macromolecule nanometer fibers, each of the obverse membrane and the reverse membrane includes one or more than one composite layer, each composite layer is formed by the soft phase macromolecule nanometer fibers, or the polyimide nanometer fibers and the soft phase macromolecule nanometer fibers, and in the middle inner layers and all the composite layers, contents of the polyimide nanometer fibers are decreased progressively and contents of the soft phase macromolecule nanometer fibers are increased progressively from the middle inner layer outwards. By using the preparation method of the soft phase macromolecule/polyimide gradient type composite nanometer fiber membrane, not only are mechanical properties of the soft phase macromolecule/polyimide gradient type composite nanometer fiber membrane improved, but also functionality of a gel electrolyte is endowed to the soft phase macromolecule/polyimide gradient type composite nanometer fiber membrane, and therefore integration of the soft phase macromolecule/polyimide gradient type composite nanometer fiber membrane and the gel electrolyte is achieved.