Study of Aromatic Polyimides Containing Cyano Groups

摘要: Aromatic polyimides containing cyano groups have been synthesized by solution polycondensation reaction of an aromatic diamine having and ether groups, with various dianhydrides flexible such as carbonyl hexafluoroisopropylidene. The properties these were compared those related polymers based on rigid dianhydrides, biphenyltetracarboxylic pyromellitic dianhydride, the same diamine. easily soluble in polar organic solvents, N-methylpyrrolidinone, N,N-dimethylacetamide N,N-dimethylformamide exhibited remarkable film forming ability, except for polyimide derived from dianhydride. They showed high thermal stability, initial decomposition temperature being above 400 °C glass transition range 210—260 °C. Conformational rigidity parameters calculated Monte Carlo method allowance hindered rotation....