HIGH HEAT RESISTANCE, TRANSPARENT AND SOLUBLE BIPHENYL-TYPE POLYIMIDE THIN FILM, PREPARATION METHOD THEREFOR AND USE THEREOF

摘要

Disclosed are a high heat resistance, transparent and soluble biphenyl-type polyimide thin film, a preparation method therefor and the use thereof. The preparation method comprises mixing a triarylmethane diamine monomer with a dangling ring, 3,3',4,4'-biphenyltetracarboxylic dianhydride, a polar aprotic solvent and a catalyst, and stirring same until uniform at room temperature so as to obtain a clear solution; reacting the clear solution using microwave radiation to obtain a biphenyl-type polyimide solution; adding the biphenyl-type polyimide solution into ethanol dropwise, and precipitating a fibrous precipitate, so as to obtain a fibrous biphenyl-type polyimide; dissolving the fibrous biphenyl-type polyimide in the polar aprotic solvent, then applying same to glass, and drying and cooling same; and subjecting same to polycondensation with the triarylmethane diamine monomer with a dangling ring and 3,3',4,4'-biphenyltetracarboxylic dianhydride to make the high heat resistance, transparent and soluble biphenyl-type polyimide thin film. The method addresses the problem with existing polyimides that the heat resistance cannot be balanced with the solubility and light transmittance.