Synthesis of Materials for Perfluorinated Polyimides

To generate high-molecular-weight perfluorinated polyimides, it is first necessary to determine how fluorine affects the reactivity of the monomers. In particular, the effect of substituting hydrogen with fluorine on diamine reactivity is important because kinetic studies of the acylation of conventional monomers have revealed that acylation rate constants can differ by a factor of 100 among different dianhydrides, and by a factor of 10 among different diamines.  

When 8FBZ diamine, the least reactive one, was reacted with 6FDA, no NMR signal of the corresponding poly(amic acid) was detected. 

We reported the relationships between the NMR chemical shifts and the rate constants of acylation k) as well as such electronic-property-related parameters as ionization potential (IP), electronic affinity (EA), and molecular orbital energy for a series of aromatic diamines and aromatic dianhydrides.The usefulness of 

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