Preparation method of copolymerized polyimine dynamic polymer film containing large-volume side group

The invention discloses a preparation method of a copolymerized polyimine dynamic polymer film containing a large-volume side group. The preparation method comprises the following steps: selecting different aromatic diamines with the large-volume side group, terephthalaldehyde (TA) and a cross-linking agent tris (2-aminoethyl) amine (TERN) as raw materials; comprising the following steps: S1, completely dissolving terephthalaldehyde in an organic solvent, then adding at least one aromatic diamine monomer with a large-volume side group, and fully stirring for reaction to obtain an aldehyde-terminated aromatic polyimide prepolymer; s2, adding a cross-linking agent monomer containing at least three functional groups into the prepolymer obtained in the step S1, and stirring for reaction to obtain a dynamic covalent cross-linked polyimine system containing a large-volume side group; s3, performing solvent evaporation and vacuum drying treatment on the dynamic covalent cross-linked polyimine system obtained in the