| 초록 |
The authors report the synthesis and characterization of a polyimide (PI) series derived from 4,4'-((perfluoro-[1,1'-biphenyl]-4,4'-diyl)bis(oxy))bis(2,6-dimethylaniline) (8FBPODMA). The 8FBPODMA monomer containing a perfluorobiphenyl group with two 2,6-dimethylaniline units connected by an ether bond was synthesized and polycondensed with several aromatic dianhydrides, including 4,4’-biphthalic anhydride (BPDA), 4,4’-oxydiphthalic anhydride (ODPA), pyromellitic dianhydride (PMDA), and 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA), by the traditional two-step imidization procedure. All PIs shows high optical transparency, higher than 80% at 500 nm for a thickness of ca. 10 um and good thermal properties. The thermal decomposition temperatures (T10%) of the PIs are in the range of 507 to 527 °C and the glass transition temperatures (Tg) are in the range of 280 to 345 °C. In addition, the PIs have low refractive indices because of their high fluorine contents. |
