Synthesis of a Novel Perfluorinated Dianhydride

The lack of flexibility of the polymer chain has to be improved by introducing linkage groups into the dianhydride component. Accordingly, continuous and flexible films of perfluorinated polyimides are expected to be obtained by combining diamines, which have high reactivities, with dianhydrides, which have flexible molecular structures. 

It should be noted that this molecule has two ether linkages that give flexibility to the molecular structure. In addition, the bulky -Cl groups in P6FDA are replaced by fluorine atoms, lire 8c of lOFEDA (157.5 ppm from I MS) was almost the same as that of P6FDA (157.6 ppm), so this dianhydride should have higher reactivity than unfluorinated and partially fluorinated dianhydrides. 

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