| 초록 |
A highly transparent fluorinated polymide with urea moieties (fPIU) is synthesized and its optical and mechanical properties are characterized in this study. A fluorinated urea oligomer (fUO) with amine groups at both ends is prepared by conjugating 1,3-bis(isocyanatomethyl) cyclohexane (CDI) and 2,2'-bis(trifluoromethyl)-[1,1'-biphenyl]-4,4'-diamine (TFDB). fUO is then reacted with 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) and 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) to prepare fPIU. TFDB, 6FDA, and BPDA are reacted to prepare a conventional transparent fluorinated polyimide (CfPI) as a reference. Interestingly, fPIU film shows excellent optical and mechanical properties compared to CfPI film. These are attributed to the unique hydrogen bonding interaction and charge transfer complex interaction between fPIU chains. |
