Investigation of γ-irradiated polyvinylidene fluoride and its acute toxicity
| Autor: | Matthew P. Confer, E. N. Klimanova, David A. Dixon, Sergei Demidov, Uguljan Yu. Allayarova, Denis V. Mishenko, Sadulla R. Allayarov |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Chemistry Radical Organic Chemistry chemistry.chemical_element Polymer Photochemistry Biochemistry Polyvinylidene fluoride Peroxide law.invention Inorganic Chemistry chemistry.chemical_compound Polymer degradation X-ray photoelectron spectroscopy law Fluorine Environmental Chemistry Physical and Theoretical Chemistry Electron paramagnetic resonance |
| Zdroj: | Journal of Fluorine Chemistry. 251:109885 |
| ISSN: | 0022-1139 |
| Popis: | Polyvinylidene fluoride (PVDF) is an industrial polymer with many applications. The EPR spectrum of polyvinylidene fluoride (PVDF) irradiated by γ-rays at low temperature (-196°C) provides evidence for the presence of radicals formed by loss of a fluorine atom from PVDF, and polyenyl radicals. Polyenyl radicals dominate in the polymer irradiated at room temperature. Peroxide radicals formed as a result of oxidation of primary free radicals by atmospheric oxygen are observed in the EPR spectrum of a polymer irradiated in air, or when air is introduced to a polymer irradiated in a vacuum. Carbonization and oxidation of γ-irradiated PVDF were observed in the XPS spectrum. A model for polymer degradation based on correlated G3(MP2) molecular orbital theory electronic structure calculations is described. The presence of HF in the products and a low yield of products with the composition CxFyHz indicate the absence of noticeable thermal destruction of the main polymer chain upon heating to 220°C of both the initial and γ-irradiated PVDF. Although any HF released during the PVDF dehydrofluorination would be toxic, a study of the acute toxicity of γ-irradiated PVDF showed that the polymer does not exhibit toxicity after a single intragastric route of administration to mice. |
| Databáze: | OpenAIRE |
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