Designed poly(ether-imide)s and fluoro-copoly(ether-imide)s: Synthesis, characterization and their film properties

✍ Scribed by Rohitkumar H. Vora; Suat Hong Goh

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 722 KB
• Volume: 132
• Category: Article
• ISSN: 0921-5107
• DOI: 10.1016/j.mseb.2006.02.049

✦ Synopsis

Two series of amorphous fluoro-poly(ether-imide) (6F-PEI) and one series of fluoro-coploy(ether-imide) (6F-CoPEI) polymers based on 2,2bis(3,4-dicarboxyphenyl) hexafluropropane dianhydride (6FDA) and di-ether-containing diamines: 1,2 -bis(4-aminophenoxy)benzene (o-BAPOB) and 4,4 -bis(4-aminophenoxy)diphenyl sulfone (p-SED) were synthesized. The solution properties, chemical resistance, thermal stability, mechanical properties, thermo-oxidative and hydrolytic stability of selected 6F-PEIs and 6F-CoPEIs were studied. The dielectric constant (ε ) values of 6F-PEI and 6F-CoPEI were estimated by additive group contribution calculation using mathematical equations defined by the Lorentz-Lorenz's theory and the Vogel's theory, and by Vora-Wang equations, respectively. These polymers not only showed excellent electrical properties but also excellent long-term thermo-oxidative stability and reduced water absorption relative to non-fluorinated polyimides. The estimated dielectric constant of these polymers (ε < 3.15) were lower than those of commercially available poly(ether-imide) ULTEM ® 1000 and polyimides Kapton ® H, respectively at 1 kHz. The analytical results are summarized and discussed.