| abstract |
The invention discloses a polyimide containing a caged phosphate structure and a preparation method thereof. The polyimide has the following general formula: Wherein, A is a structural unit derived from a dianhydride compound; B 1 is a structural unit derived from a diamine compound; B 2 is a structural unit derived from a diamine containing a cage-like phosphate structure, the cage-containing The diamine of phosphate ester structure has one or any combination of the following structures: Wherein the R group is a caged phosphate structure, and its structure is as follows: The polyimide film of the present invention has significantly improved resistance to AO and plasma oxygen, better resistance to ultraviolet UV and vacuum ultraviolet (vuv) radiation, no color change under ultraviolet (UV) irradiation, excellent Fire resistance, thermal decomposition in the air has a high carbon residue rate. |