M. BRUMA, I. SAVA, E. HAMCIUC,
C. HAMCIUC, M. D. DAMACEANU
Synthesis and Characterization of Heterocyclic Polyimides as High Performance
Materials with Potential Applications in RF MEMS Devices Processing
Abstract.
Three heterocyclic polyimides have been prepared by polycondensation in solution
at high temperatures of benzophenontetracarboxylic dianhydride with aromatic
diamines containing preformed oxadiazole ring. One of these polymers is soluble
in polar aprotic solvents, while the other are only soluble as intermediate
polyoxadiazole-amidic acids. The polyimides showed high thermal stability with
decomposition temperature being above 450°C and glass transition above 250°C.
All polyamidic acids and one polyimide showed remarkable film-forming ability,
which makes the present polymers potential candidates for applications as high
performance materials. |