Inverse effect in simultaneous thermal and radiation aging of EVA insulation

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46356088%3A_____%2F15%3A%230001737" target="_blank" >RIV/46356088:_____/15:#0001737 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.3144/expresspolymlett.2015.36" target="_blank" >http://dx.doi.org/10.3144/expresspolymlett.2015.36</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3144/expresspolymlett.2015.36" target="_blank" >10.3144/expresspolymlett.2015.36</a>

Result language
angličtina
Original language name
Inverse effect in simultaneous thermal and radiation aging of EVA insulation
Original language description
Poly(ethylene-co-vinyl acetate) (EVA) insulation of the cable applied in nuclear power plants was accelerated aged by gamma-rays at two various temperatures, namely 55 and 85 degrees C. Radiation degradation in the dose range of 01500 kGy was monitored using a Differential Scanning Calorimetry method by measuring oxidative induction temperature (OITp), gel fraction, mechanical and electrical tests. It was confirmed that a dose rate effect in the range of 420-1500 Gy/h was negligible whereas progress of degradation with increasing dose was strongly temperature dependent. For the insulation accelerated aged at 85 degrees C the OITp and permittivity measurements confirmed lower degradation than for the specimens radiation treated at 55 degrees C at the same dose rates. It was postulated that an inverse thermal effect resulted from radiation induced cross-linking facilitated by melting of EVA crystallites at 85 degrees C.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
JF - Nuclear energy
OECD FORD branch
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Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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