| 초록 |
Polyimides with low dielectric constant and excellent adhesion were prepared from a diamine containing phosphine oxide moiety such as bis(3-aminophenyl-2,3,5,6-tetrafluoro-4-trifluoromethyl phenyl phosphine oxide (mDA7FPPO) and rigid-rod type dianhydrides with fluorine groups, such as 3,6-di(3’,5’-bis(trifluoromethyl)phenyl)pyromellitic dianhydride (12FPMDA) and 3,6-di(4’-trifluoromethylphenyl)pyromellitic dianhydride (6FPMDA). The polyimides were synthesized via a conventional two-step process; preparation of poly(amic-acid) in NMP, followed by solution imidization with o-DCB. The molecular weight of the polyimides was controlled to 25,000 g/mol and the polymers were characterized by FT-IR, NMR, DSC, TGA and TMA. In addition, dielectric constant as well as adhesive property were also evaluated. |
