| Autor: |
Artem'eva, V. N., Smirnova, E. A., Kukarkin, E. N., Mikhailova, N. V., Lyubimova, G. V., Kudryavtsev, V. V., Koton, M. M. |
| Zdroj: |
Russian Chemical Bulletin; November 1989, Vol. 38 Issue: 11 p2259-2265, 7p |
| Abstrakt: |
The thermal imidization of complexes of benzophenonetetracarboxylic acid diester with diamines is greatly different from the thermal imidization of the corresponding mechanical mixtures. Preliminary complexation gives a considerably greater degree of completion of the imidization. It is concluded that diffusion processes play a decisive role in the solid-phase thermal imidization of the complexes. On the basis of similar values of the free energy of activation at identical temperatures for complexes with different diamines, it is concluded that the reactivity of the functional groups has little influence on the kinetics of solid-phase imidization of the complex. Alternative schemes are proposed for the formation of polyimides from the complexes, leading to an intermediate mixed-unit prepolymer with amido acid, amido ester, and imide units in the chain. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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