Magnesium-aluminum coordination polymer precursor, magnesium-aluminum spinel fiber as well as preparation method and application of magnesium-aluminum coordination polymer precursor and magnesium-aluminum spinel fiber

The invention relates to a magnesium-aluminum coordination polymer precursor, a magnesium-aluminum spinel fiber as well as a preparation method and application of the magnesium-aluminum spinel fiber. The preparation method comprises the following steps: firstly, adding a magnesium source and an aluminum source into a mixed solution of water and an organic solvent, introducing a beta-diketone ligand for coordination to prepare magnesium-aluminum coordination polymer precursor powder, then taking the magnesium-aluminum coordination polymer precursor as a raw material, adding a spinning aid to obtain a precursor spinning solution, and carrying out electrostatic spinning and heat treatment to obtain the magnesium-aluminum spinel fiber. The obtained magnesium aluminate spinel fiber is high in strength, uniform and adjustable in diameter, good in flexibility, compact in structure, smooth in fiber surface, free of defects such as air holes and cracks and capable of being used for a long time in the environment at th