Synthesis and Properties of Designed Low-k Fluoro-Copolyetherimides. Part 1

• Published in: Advanced functional materials Vol. 11; no. 5; pp. 361 - 373
• Main Authors: Vora, R. H., Krishnan, P. S. G., Goh, S. H., Chung, T.-S.
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag GmbH 01.10.2001; WILEY‐VCH Verlag GmbH
• Subjects: Dielectric constant; Dielectric constant, low; Fluoro-polyetherimides; low; Polyetherimides
• ISSN: 1616-301X; 1616-3028
• DOI: 10.1002/1616-3028(200110)11:5<361::AID-ADFM361>3.0.CO;2-B

Polyetherimides are versatile melt‐processable engineering resins. A series of fluoro‐polyetherimides compositions based on diether‐containing diamines were designed on paper and their dielectric constants (ϵ′) estimated before their synthesis. Experimentally determined ϵ′ values were compared with the estimated values. The amorphous polyetherimides containing bis‐trifluoromethyl groups exhibited not only low dielectric constants—lower than those of the commercially available polyetherimide ULTEM 1000 and polyimide Kapton H at 1 kHz—but also excellent long‐term thermo‐oxidative stability and reduced water absorption relative to non‐fluorinated polyimides. Polyetherimides (PEIs) are versatile melt‐processable resins applicable in microelectronics as low‐dielectric‐constant materials. Several fluoro‐PEIs—e.g., 6FDA + BDAF (see Figure)—were designed on paper and their theoretical dielectric constants compared with experimental values. Amorphous PEIs bearing bis‐CF3 groups showed the desired properties.