Studies on heat‐resistant poly(metal phthalocyanine)‐imide copolymers

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Abstract
Several new poly(metal phthalocyanine)imide copolymers have been prepared using 3,3′,4,4′‐benzophenonetetracarboxylic dianhydride (BPTDA), metal(11) 4,4′,4″,4″′‐phthalocyanine tetraamines (MPTA), p‐phenylenediamine, 4,4′‐methylenedianiline, and 9,9‐bis(4‐aminophenyl)‐fluorene (BAF). The attractive feature of these polymers is their high thermooxidative and thermal stability. The polymer decomposition temperatures of all the imide copolymers are greater than 500°C in air and N atomspheres. Another noteworthy property is their high char yield: 60–78% at 800°C in a N2 atmosphere. Variation of the metal phthalocyanine concentration has a remarkable effect on the thermal stability and degree of polymerization. The most preferred molar proportion of the reagents MPTA, diamine, and BTDA is 1.25:7.5:10. These polymers may be useful in the preparation of heat‐resistant films and fibers.
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