AROMATIC POLYIMIDES CONTAINING POLAR NITRILE GROUPS

摘要: A series of polyimides containing nitrile groups has been synthesized by solution polycondensation reaction two aromatic diamines having group and ether linkages with various dianhydrides, namely 4,4'-oxidiphthalic dianhydride, benzophenonetetracarboxylic dianhydride hexafluoroisopropylidene-diphthalic dianhydride. The polymers were easily soluble in polar organic solvents, such as N-methylpyrrolidone, N,N-dimethylfonnamide N,N-dimethylacetamide, gave flexible thin films casting their solution. They present high thermal stability, decomposition temperature being above 438°C. exhibited a glass transition the range 203-284°C, reasonable interval between temperature.