| 초록 |
A highly colorless polyimide with low fluorine content (CPILF) is synthesized and its optical and mechanical properties are examined. A functional amide-imide oligomer (AIO) with amide groups at both ends is synthesized using trimellitic anhydride chloride and 2,2'-bis(trifluoromethyl)-[1,1'-biphenyl]-4,4'-diamine (TFDB). AIO is then reacted with 1,2,3,4-cyclobutanetetracarboxylic dianhydride (CBDA), 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) to prepare the precursor of CPILF. The precursor is then converted into CPILF by chemical imidization. In order to prepare conventional colorless fluorinated polyimide (CCPI) as a reference, TFDB, 4,4'-Biphthalic Anhydride (BPDA), and 6FDA are polymerized. Interestingly, the flexible cover window based on CPILF shows more outstanding optical and mechanical properties than that based on CCPI, which results from the hydrogen bonding between amide-imide oligomeric blocks and imide groups in the CPILF chains. |
