| Autor: |
Kuhn, K. J., Hahn, B., Percec, V., Urban, M. W. |
| Zdroj: |
Applied Spectroscopy; July 1987, Vol. 41 Issue: 5 p843-847, 5p |
| Abstrakt: |
The reaction of PVF2films in aqueous NaOH with the use of tetrabutylammonium hydrogen sulfate as phase transfer catalyst results in surface dehydrofluorination. Subsequent examination of the PVF2surface using ATR FT-IR affords evidence as to the structure of dehydrofluorinated PVF2. It is found that the infrared bands at 1402, 1225, 1194, and 882 cm−1are sensitive to the surface treatment. The origin and behavior of these bands are discussed. It is observed that upon dehydrofluorination the FT-IR spectra of the PVF2surface exhibit two infrared bands at 1613 cm−1and 1717 cm−1which arise from the formation of carbon-carbon double bonds. The band at 1613 cm−1is due to conjugated -(-CH=CF-)- units, whereas the 1717 cm−1band is assigned to the -(-CF=CF-)- units which arise from resonance at structural head-to-head and tail-to-tail defects. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
