| Autor: |
M.J.D. Low, M.L. O'shea, C. Morterra |
| Rok vydání: |
1990 |
| Předmět: |
|
| Zdroj: |
Materials Chemistry and Physics. 26:193-209 |
| ISSN: |
0254-0584 |
| DOI: |
10.1016/0254-0584(90)90038-c |
| Popis: |
Fourier transform photothermal beam deflection spectroscopy was used to examine chars produced by heating pure polyvinylidene fluoride (PVDF) in a N2 stream at temperatures ranging from 300 to 700°C. The infrared spectra obtained provide direct information about the destruction of the original polymer structure as well as its carbonization. PVDF exhibits a high thermal stability, characteristic of polyvinyl fluorides and spectroscopic evidence of the onset of degradation occurs near 300°C. Increasing the pyrolysis temperature results in a complex degradation process and a pyrolytic residue made up of largely aliphatic and fluoro-aromatic structures. The loss of most of the hydrogen-containing groups at temperatures in excess of 400°C results in a spectrum showing no vibrational features at wavenumbers >2000 cm−1 and a high temperature profile quite different from those previously observed for the polyvinyl chloride, bromide and fluoride chars. The possible mechanisms for the degradation of PVDF as suggested by the spectroscopic evidence is discussed in detail. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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