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|Title:||Designed poly(ether-imide)s and fluoro-copoly(ether-imide)s: Synthesis, characterization and their film properties|
Vora-Wang equations for estimation of dielectric constant
|Citation:||Vora, R.H., Goh, S.H. (2006-07-25). Designed poly(ether-imide)s and fluoro-copoly(ether-imide)s: Synthesis, characterization and their film properties. Materials Science and Engineering B: Solid-State Materials for Advanced Technology 132 (1-2) : 24-33. ScholarBank@NUS Repository. https://doi.org/10.1016/j.mseb.2006.02.049|
|Abstract:||Two series of amorphous fluoro-poly(ether-imide) (6F-PEI) and one series of fluoro-coploy(ether-imide) (6F-CoPEI) polymers based on 2,2′-bis(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. © 2006 Elsevier B.V. All rights reserved.|
|Source Title:||Materials Science and Engineering B: Solid-State Materials for Advanced Technology|
|Appears in Collections:||Staff Publications|
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