info:eu-repo/semantics/article
Changes in the crystalline degree in neutron irradiated EPDM viewed through infrared spectroscopy and inelastic neutron scattering
Fecha
2018-07Registro en:
Lambri, Osvaldo Agustin F.; Giordano, Enrique David Victor; Bonifacich, Federico Guillermo; Jimenez Ruiz, Mónica; Lambri, Melania Lucila; et al.; Changes in the crystalline degree in neutron irradiated EPDM viewed through infrared spectroscopy and inelastic neutron scattering; Universidade Federal do Rio de Janeiro; Matéria; 23; 2; 7-2018; 1-10
1517-7076
CONICET Digital
CONICET
Autor
Lambri, Osvaldo Agustin F.
Giordano, Enrique David Victor
Bonifacich, Federico Guillermo
Jimenez Ruiz, Mónica
Lambri, Melania Lucila
Sanchez, Fernando Ariel
Pérez Landazábal, José Ignacio
García, José Ángel
Boschetti, Carlos Eugenio
Recarte, Vicente
Plazaola Muguruza, Fernando
Salvatori, Pablo Ernesto
Resumen
The changes in the degree of crystallinity in commercial Ethylene Propylene Diene rubber-type M (EPDM) irradiated with neutrons at different doses has been studied by means of inelastic neutron scattering and infrared absorption spectroscopy experiments. EPDM samples were taken from the housing of non-ceramic electrical insulators which are used in outdoor transmission lines of 66 kV. Inelastic neutron scattering spectra were recorded at 5 K with an accessible energy-transfer range between 180 - 3500 cm-1. Infrared studies were performed at room temperature with an energy transfer between 4000 - 400 cm-1. Controlled neutron irradiation allows to obtain different volume fraction and size of crystalline zones in EPDM. The obtained results are discussed and correlated with studies of differential scanning calorimetry, dynamic mechanical analysis and positron annihilation lifetime spectroscopy from where the changes in crystallinity in EPDM were indirectly studied. Inelastic neutron scattering studies were not appropriate for determining the changes in the crystallinity degree in neutron irradiated commercial EPDM. In contrast, from infrared absorption spectroscopy the changes in crystallinity could be determined successfully.