Synthesis and Properties of Aromatic Polyimides Containing the Six-Membered Ring System.

摘要

This work was performed to determine the best synthetic procedure for the preparations of six-membered polyimides, and the extent to which processability parameters such as solubility and fusibility could synthetically be altered in the polymer system. The six-membered imide ring system has excellent hydrolytic stability in highly corrosive solvents, both acidic and basic; however, the system has not been prepared in high molecular weight due to the 'perc' effect of the dianhydride monomers. A number of new aryleneoxy and arylenethio-bis-'pere' anhydrides have been synthesized for use as monomers for the preparation of soluble and fusible polyimides containing six-membered rings. The bis-anhydrides were converted to polyimides by solution polycondensation with oxyarylenediamines. The polyimides were soluble in m-cresol and exhibited glass transition temperatures in the 260-360 C range. All of the polymers displayed good thermal and thermal oxidative properties; although high molecular weights were not achieved. (Author)