Inverse effect in simultaneous thermal and radiation aging of EVA insulation
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°C. Radiation degradation in the dose range of 0–1500 kGy was monitored using a Differential Scanning Calorimetry method by me...
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| Format: | Article |
| Language: | English |
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Budapest University of Technology and Economics
2015-04-01
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| Series: | eXPRESS Polymer Letters |
| Subjects: | |
| Online Access: | http://www.expresspolymlett.com/letolt.php?file=EPL-0005694&mi=cd |
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| author | G. Przybytniak J. Boguski V. Placek L. Verardi D. Fabiani E. Linde U. W. Gedde |
| author_facet | G. Przybytniak J. Boguski V. Placek L. Verardi D. Fabiani E. Linde U. W. Gedde |
| author_sort | G. Przybytniak |
| collection | DOAJ |
| 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°C. Radiation degradation in the dose range of 0–1500 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°C the OITp and permittivity measurements confirmed lower degradation than for the specimens radiation treated at 55°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°C. |
| format | Article |
| id | doaj-art-5069ecdd266840f5b351d4ae720864c8 |
| institution | Kabale University |
| issn | 1788-618X |
| language | English |
| publishDate | 2015-04-01 |
| publisher | Budapest University of Technology and Economics |
| record_format | Article |
| series | eXPRESS Polymer Letters |
| spelling | doaj-art-5069ecdd266840f5b351d4ae720864c82025-08-20T03:34:35ZengBudapest University of Technology and EconomicseXPRESS Polymer Letters1788-618X2015-04-019438439310.3144/expresspolymlett.2015.36Inverse effect in simultaneous thermal and radiation aging of EVA insulationG. PrzybytniakJ. BoguskiV. PlacekL. VerardiD. FabianiE. LindeU. W. GeddePoly(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°C. Radiation degradation in the dose range of 0–1500 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°C the OITp and permittivity measurements confirmed lower degradation than for the specimens radiation treated at 55°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°C.http://www.expresspolymlett.com/letolt.php?file=EPL-0005694&mi=cdMaterial testingradiation degradationthermal degradationinverse thermal effectpoly(ethylene-co-vinyl acetate |
| spellingShingle | G. Przybytniak J. Boguski V. Placek L. Verardi D. Fabiani E. Linde U. W. Gedde Inverse effect in simultaneous thermal and radiation aging of EVA insulation eXPRESS Polymer Letters Material testing radiation degradation thermal degradation inverse thermal effect poly(ethylene-co-vinyl acetate |
| title | Inverse effect in simultaneous thermal and radiation aging of EVA insulation |
| title_full | Inverse effect in simultaneous thermal and radiation aging of EVA insulation |
| title_fullStr | Inverse effect in simultaneous thermal and radiation aging of EVA insulation |
| title_full_unstemmed | Inverse effect in simultaneous thermal and radiation aging of EVA insulation |
| title_short | Inverse effect in simultaneous thermal and radiation aging of EVA insulation |
| title_sort | inverse effect in simultaneous thermal and radiation aging of eva insulation |
| topic | Material testing radiation degradation thermal degradation inverse thermal effect poly(ethylene-co-vinyl acetate |
| url | http://www.expresspolymlett.com/letolt.php?file=EPL-0005694&mi=cd |
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