| Autor: |
M.L. O'shea, M.J.D. Low, C. Morterra |
| Rok vydání: |
1991 |
| Předmět: |
|
| Zdroj: |
Materials Chemistry and Physics. 28:9-31 |
| ISSN: |
0254-0584 |
| DOI: |
10.1016/0254-0584(91)90049-z |
| Popis: |
Chars prepared by pyrolyzing polyvinyl chloride, polyvinyl bromide, and polyvinyl fluoride in vacuum were oxidized in pure 0 2 at 150 Torr over the 100–600°C range. The chars were chosen to be representative of each of the different stages of the degradation and carbonization process of the specific polyvinyl halide and/or the group as a whole. Reactions leading to the formation of surface oxidic species were followed with infrared photothermal beam deflection spectroscopy and the results discussed in relation to the nature of the individual char and its extent of carbonization. Some band assignments to specific surface species were made, and the evolution of these bands was followed and discussed in the context of the surface properties of the char precursor. Low temperature chars ( 450 °C resulted in the burn-off of the chars and the accompanying loss of acidic carbonylic species. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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