Novel Soluble Polyimide Containing 4-tert-Butyltoluene Moiety: Synthesis and Characterization

✍ Scribed by Chenyi Wang; Guang Li; Jianming Jiang

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 85 KB
• Volume: 27
• Category: Article
• ISSN: 0256-7660
• DOI: 10.1002/cjoc.200990378

✦ Synopsis

Abstract

Based on the synthesis of a rigid aromatic diamine, α,α‐bis(4‐aminophenyl)‐4‐(__t‐__butyl)toluene (1), a novel polyimide (PI) 3 was prepared from this diamine monomer and 4,4′‐oxydiphthalic dianhydride via a one‐step high‐temperature polycondensation. FT‐IR, ^1^H NMR and elemental analysis were used to investigate the chemical structures of 1 and 3. The results confirmed that they agreed with the proposed structures for both 1 and 3 completely. The obtained PI 3 showed excellent solubility in most common solvents such as N‐methyl‐2‐pyrrolidinone, N,N‐dimethylacetamide, N,N‐dimethylformamide, chloroform, dichloromethane and tetrahydrofuran. The resulting strong and flexible film exhibited high thermal stability with the glass transition temperature at 317°C and the temperature at 10% weight loss beyond 519°C in both air and nitrogen atmospheres. Moreover, the film also showed high optical transparency, low dielectric constant (3.13 at 1 MHz), low water absorption (0.40%) and hydrophobic character.