A highly transparent optical film with excellent mechanical properties and folding reliability using intensification of mismatched charge transfer complexation for flexible displays
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초록
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A highly transparent fluorinated polyamide-imide (fPAI) is synthesized and its optical and mechanical properties are examined in this study. A fluorinated amide oligomer with amine groups at the ends (fAO) is synthesized by conjugating terephthaloyl chloride (TPCL) with 2,2'-bis(trifluoromethyl)-[1,1'-biphenyl]-4,4'-diamine (TFDB). fAO is then reacted with 1,2,3,4-cyclobutanetetracarboxylic dianhydride (CBDA), 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), and 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) to prepare fPAI. To prepare three different references, fAO is reacted with CBDA, BDPA, or 6FDA alone. Interestingly, fPAI exhibits significantly improved optical and mechanical properties, as well as high folding reliability, in comparison to all other references. These are ascribed to a unique supramolecular structure characterized by intensification of mismatched charge transfer complexation.