Synthesis and Properties of Aromatic Polyimides Containing the Six- Membered Ring System
Final technical rept. Mar 1973-Apr 1974
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH
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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.
- Polymer Chemistry