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https://repositorio.ufba.br/handle/ri/8269| Tipo: | Artigo de Periódico |
| Título: | Effects of X-ray radiation on Nafion membrane |
| Título(s) alternativo(s): | Polymer Degradation and Stability |
| Autor(es): | Almeida, Selma Helena de Kawano, Yoshio |
| Autor(es): | Almeida, Selma Helena de Kawano, Yoshio |
| Abstract: | The effects of X-ray radiation on Nafion-117 membrane were investigated by electron paramagnetic resonance spectroscopy (EPR), photoacoustic infrared spectroscopy (PAS), Raman scattering and ultraviolet-visible electronic absorption spectroscopy. EPR spectrum of irradiated Nafion membrane reveals the presence of peroxy free radical similar to that found in irradiated polytetrafluoroethylene. The Raman and infrared (IR) spectra of irradiated samples show the appearance of new bands at 1458, 1700 and 1773 cm−1, that can be associated with the presence of C=O and C=C groups. In addition, Raman and IR spectra show a band intensity change associated with the stretching modes of C–O, C–S and SO3-, indicating scissions of C–S and C–O bonds and SO2 liberation. UV-Vis spectra of irradiated samples exhibit bands at 196, 230 and 273 nm, whose intensities increase with irradiation doses and with aging time. |
| URI: | http://www.repositorio.ufba.br/ri/handle/ri/8269 |
| Data do documento: | 1998 |
| Aparece nas coleções: | Artigo Publicado em Periódico (Química) |
Arquivos associados a este item:
| Arquivo | Descrição | Tamanho | Formato | |
|---|---|---|---|---|
| Almeida.pdf Restricted Access | 250,64 kB | Adobe PDF | Visualizar/Abrir Solicitar uma cópia |
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