Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1396578 | European Polymer Journal | 2008 | 9 Pages |
Abstract
A novel fluorinated aromatic diamine 1,1â²-bis(4-aminophenyl)-1-(3-trifluoromethylphenyl)-2,2,2-trifluoroethane (6FDAM) was synthesized in a simple procedure, which was then employed to prepare a series of fluorinated polyimides with commercial aromatic dianhydrides, such as pyromellitic dianhydride (PMDA), 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane (6FDA), 3,3â²,4,4â²-benzophenonetetracarboxylic dianhydride (BTDA) and 4,4â²-oxydiphthalic anhydride (ODPA). The polyimides exhibited good solubility in strong dipolar solvents such as NMP, DMAc, DMF and m-cresol as well as some of low boiling point organic solvents of THF and CHCl3, etc. Experimental results indicated the polyimides possessed low moisture adsorptions of 0.42-0.95%, low dielectric constant of 2.71-2.95 at 1Â MHz, high dielectric strength of 92.0-122.6Â kV/mm and good optical transparency with cutoff wavelengths of UV-vis at 330-375Â nm. The polyimides also exhibited good mechanical properties as well as excellent thermal and thermo-oxidative stability. The fluorinated polyimides possessed better solubility, lower dielectric constant and water adsorption as well as higher optical transparency than the representative non-fluorinated polyimide derived from PMDA and 4,4â²-oxydianiline (ODA).
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Ziyi Ge, Lin Fan, Shiyong Yang,