| 초록 |
A colorless fluorinated polyimide (fPI) is synthesized and its optical and mechanical properties are characterized in this study. Firstly, a diamino-terminated oligomer based on amide and amic acid groups is synthesized by reacting trimellitic anhydride chloride and 2,2'-bis(trifluoromethyl)-[1,1'-biphenyl]-4,4'-diamine (TFDB). The resulting oligomer is then reacted with cyclobutane-1,2,3,4-tetracarboxylic dianhydride (CBDA) and 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) to prepare fPI. As a reference, TFDB, 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA), and 6FDA are polymerized to prepare conventional colorless fluorinated polyimide (cfPI). Interestingly, the polymeric film based on fPI exhibits more outstanding optical and mechanical properties than that based of cfPI. This results from the unique alicyclic structure and the strong hydrogen bonding between amide groups and imide groups. |
