| 摘要 |
Disclosed is a manufacturing method of a graphite sheet, comprising a step of forming a polyamic acid by polymerizing diamines and a dianhydride. The polyamic acid is solvent which is casted on a substrate and hot baked to form a polyamic acid film or gel film. The polyamic acid film or gel film is biaxially stretched at a high temperature imidization or chemical imidization to form the polyimide film. The polyimide film is then carbonized and graphitized to form a graphite sheet. The diamines include a diamine of Chemical Formula 1 and a diamine of Chemical Formula 2, and the dianhydride includes a dianhydride of Chemical Formula 3, Chemical Formula 4, Chemical Formula 5, Chemical Formula 6, Chemical Formula 7, Chemical Formula 8, Chemical Formula 9, or combinations thereof. |
