A method to prepare a new class of dianhydrides is outlined. A representative polyimide, PPI, has been prepared by a two-stage condensation reaction between polyphenylated dianhydride and 3,6-diamino-9-hexylcarbazole. The PPI is readily soluble in common organic solvents, and shows only 10 wt % loss at 555 °C.
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Walsh et al. (2001) studied this question.
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