Highly Transparent Polymeric Film Based on Colorless Fluorinated Polyimide with Excellent Mechanical Properties for Flexible Displays
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A novel colorless fluorinated polyimide (CfPI) is synthesized and its optical and mechanical properties are characterized in this study. To prepare CfPI, a diamino-terminated oligomer based on amide group and armic acid group (OAA) is synthesized using trimellitic anhydride chloride and OAA is then reacted with 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA) and 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA). As a reference, 2,2'-bis(trifluoromethyl)-[1,1'-biphenyl]-4,4'-diamine (TFDB), BPDA, and 6FDA are polymerized to prepare conventional colorless fluorinated polyimide (cCfPI). Interestingly, the polymeric film based on CfPI exhibits more outstanding optical and mechanical properties than that based of cCfPI. This is ascribed to the unique formation of charge transfer complex (CTC) of CfPI.