Abstract
A series of 4,4‘-(1,4-phenylene)bis(N-amino-2,6-diphenylpyridiniumtriflate) compounds were synthesized by reaction of 4,4‘-(1,4-phenylene)bis(2,6-diphenylpyrylium triflate) with various aromatic diamines. They were used as starting materials for the preparation of novel ionic rigid-rod polyimides. The resulting poly(amic acid)s had inherent viscosities of 0.73−1.93 dL/g. Thermal cyclodehydration of poly(amic acid)s afforded the polyimides. Their inherent viscosities were in the range of 0.31−0.58 dL/g. These polyimides are basically amorphous and are soluble in polar aprotic solvents. A lyotropic behavior could be observed in a concentrated solution of dimethylformamide and methylpyrrolidone. Thermogravimetric analyses showed that they are thermally stable with 5% weight losses recorded in the range of 459−478 °C under nitrogen and 469−489 °C in air. The polyimides had a tensile strength range of 59−93 MPa, and an elongation at break range of 5−9%. Reversibe color development of these polyimides could be observed upon irradiation in solution or in a polymer matrix.
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