IPROBYQ   25157
INSTITUTO DE PROCESOS BIOTECNOLOGICOS Y QUIMICOS ROSARIO
Unidad Ejecutora - UE
artículos
Título:
Study of the dielectric strength in EPDM from non destructive dynamic mechanical analysis experiments conducted under high electric field
Autor/es:
FEDERICO BONIFACICH; DAMIAN GARGICEVICH; FERNANDO PLAZAOLA; PABLO SALVATORI; OSVALDO A LAMBRI; JOSÉ A GARCÍA; CARLOS E. BOSCHETTI; ENRIQUE D.V. GIORDANO; RICARDO MOCELLINI; F A SÁNCHEZ
Revista:
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
Editorial:
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Referencias:
Lugar: New York; Año: 2017 vol. 24 p. 1840 - 1851
ISSN:
1070-9878
Resumen:
Inthe present work the value of the degree of area swept by the polymer chain dueto an electrical force for a given mesostructure was related to thecorresponding value of dielectric strength. This value was deduced from theelectric inclusion formalism applied to dynamic mechanical analysis (DMA)studies conducted high electric field which were performed in commercialethylene-propylene-diene M-class rubber (EPDM) used for the housing ofpolymeric electrical insulators. EPDM samples with different arrangements ofthe polymer chains and crystalline degree, promoted by controlled neutronirradiation were studied. Several characterization techniques, as infraredabsorption spectroscopy (IR), differential scanning calorimetry (DSC), positronannihilation spectroscopy lifetime (PALS) and dielectric strength (DS) werealso used. The relationship between the DS and the degree of movement ofpolymer chains promoted by electrical forces coming from the electric fieldapplied in a non destructive test as the DMA was successfully established. Infact, a larger empty space in the sample leads to larger areas swept by thepolymer chains during bending under the application of the field strength inthe dynamic mechanical analysis tests. Therefore, an increase in the capabilityof movement of charges occurs, corresponding to smaller dielectric strength values.Crystallinity improves the dielectric strength due to the increase in theinternal stresses which decreases the capability of movement of the polymerchains and electric carriers by electric forces