Mechanism of radiation-induced degradation of bisphenol-A polycarbonate
We report here a new approach to study the mechanism ofradiation-induced degradation of polymeric materials based on thecombined analysis of radiolytic gases, and pyrolytic products frompreirradiated polymers by flash pyrolysis coupled to gas chromatographyFourier transformed infrared spectroscopy...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2001 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:47545407 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=47545407 |
| Access Level: | acceso abierto |
| Palabra clave: | Química GC MS FTIR radiolysis Polycarbonate |
| Sumario: | We report here a new approach to study the mechanism ofradiation-induced degradation of polymeric materials based on thecombined analysis of radiolytic gases, and pyrolytic products frompreirradiated polymers by flash pyrolysis coupled to gas chromatographyFourier transformed infrared spectroscopy mass spectrometrywith electron impact mode (GC-FTIR-MS). Bisphenol-Apolycarbonate (PC) was studied in the dose range from 0.125 to 1.0MGy. PC irradiation was accompanied by the preferential release ofcarbon monoxide followed by minor production of hydrogen, carbondioxide and methane. Pyrolyzed PC releases mainly carbon dioxide,methane, benzene, toluene, phenol and 4-methyl-phenol. On the basisof these results we suggest two main pathways of PC radiationinducedscission with equal probabilities: (a) carbonate bond and (b)aliphatic-aromatic bond ruptures. |
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