Ion SAVA
Aromatic Polyimides Based on 3, 3’-Dimethyl-4, 4’-Diaminodiphenylmethane as
Potential Material for Interlayer Dielectrics in RF MEMS Circuits
Abstract.
New aromatic polyimides have been synthesized by polycondensation reaction of 3,
3’-dimethyl-4, 4’-diaminodiphenylmethane with benzophenon tetracarboxylic
dianhydride or hexafluoroiso propylidene diphthalic anhydride in N-methylpyrrolidinone
as a solvent, followed by chemical imidization in the presence of acetic
anhydride and pyridine at 100°C for 4 h. The obtained polyimides exhibited
excellent solubility, high thermal stability and good film forming ability. The
degree of cure of polyimides has been observed to have a profound influence on
the fluorescence of the films. |