The influence of gamma radiation on the dielectric relaxation behaviour of isotactic polypropylene: The alpha relaxation
Апстракт
The high-temperature a relaxation in gamma irradiated isotactic polypropylene (iPP) was studied over the temperature (298-406 K), frequency (10(3)-10(6) Hz) and absorbed dose (0-700 kGy) ranges by means of dielectric spectroscopy. The multiple a relaxation was resolved from the 0 relaxation by curve fitting and its parameters were determined. Its position, intensity and activation energy were found to be strongly dependent on the changes in the structural and morphological parameters attributed to the exposure of the samples to radiation. Wide angle X-ray diffraction (WAXD) was used to investigate radiation-induced changes in the crystalline structure and degree of crystallinity, since this relaxation is connected with the crystal phase. Infrared (IR) spectroscopy and gel measurements were used to determine the changes in the oxidative degradation and the degree of network formation, respectively; the polar (carbonyl and/or hydroperoxide) groups that were introduced by irradiation were... considered as tracer groups. Conclusions derived according to different methods were compared. The results reveal uncommon a relaxation behaviour with gamma radiation and confirm the multiple nature of this process, together with high dielectric and/or relaxation sensitivity of iPP to the radiation-induced changes. (C) 2009 Elsevier Ltd. All rights reserved.
Кључне речи:
Polypropylene / Relaxation / Gamma radiation / Dielectric spectroscopy / Polar groupsИзвор:
Polymer Degradation and Stability, 2010, 95, 2, 164-171Финансирање / пројекти:
- Ministry of Science and Technology of the Republic of Serbia [141013]
DOI: 10.1016/j.polymdegradstab.2009.11.034
ISSN: 0141-3910
WoS: 000274711100009
Scopus: 2-s2.0-73549083845
Колекције
Институција/група
VinčaTY - JOUR AU - Suljovrujić, Edin H. AU - Trifunovic, S. AU - Miličević, Dejan S. PY - 2010 UR - https://vinar.vin.bg.ac.rs/handle/123456789/3910 AB - The high-temperature a relaxation in gamma irradiated isotactic polypropylene (iPP) was studied over the temperature (298-406 K), frequency (10(3)-10(6) Hz) and absorbed dose (0-700 kGy) ranges by means of dielectric spectroscopy. The multiple a relaxation was resolved from the 0 relaxation by curve fitting and its parameters were determined. Its position, intensity and activation energy were found to be strongly dependent on the changes in the structural and morphological parameters attributed to the exposure of the samples to radiation. Wide angle X-ray diffraction (WAXD) was used to investigate radiation-induced changes in the crystalline structure and degree of crystallinity, since this relaxation is connected with the crystal phase. Infrared (IR) spectroscopy and gel measurements were used to determine the changes in the oxidative degradation and the degree of network formation, respectively; the polar (carbonyl and/or hydroperoxide) groups that were introduced by irradiation were considered as tracer groups. Conclusions derived according to different methods were compared. The results reveal uncommon a relaxation behaviour with gamma radiation and confirm the multiple nature of this process, together with high dielectric and/or relaxation sensitivity of iPP to the radiation-induced changes. (C) 2009 Elsevier Ltd. All rights reserved. T2 - Polymer Degradation and Stability T1 - The influence of gamma radiation on the dielectric relaxation behaviour of isotactic polypropylene: The alpha relaxation VL - 95 IS - 2 SP - 164 EP - 171 DO - 10.1016/j.polymdegradstab.2009.11.034 ER -
@article{ author = "Suljovrujić, Edin H. and Trifunovic, S. and Miličević, Dejan S.", year = "2010", abstract = "The high-temperature a relaxation in gamma irradiated isotactic polypropylene (iPP) was studied over the temperature (298-406 K), frequency (10(3)-10(6) Hz) and absorbed dose (0-700 kGy) ranges by means of dielectric spectroscopy. The multiple a relaxation was resolved from the 0 relaxation by curve fitting and its parameters were determined. Its position, intensity and activation energy were found to be strongly dependent on the changes in the structural and morphological parameters attributed to the exposure of the samples to radiation. Wide angle X-ray diffraction (WAXD) was used to investigate radiation-induced changes in the crystalline structure and degree of crystallinity, since this relaxation is connected with the crystal phase. Infrared (IR) spectroscopy and gel measurements were used to determine the changes in the oxidative degradation and the degree of network formation, respectively; the polar (carbonyl and/or hydroperoxide) groups that were introduced by irradiation were considered as tracer groups. Conclusions derived according to different methods were compared. The results reveal uncommon a relaxation behaviour with gamma radiation and confirm the multiple nature of this process, together with high dielectric and/or relaxation sensitivity of iPP to the radiation-induced changes. (C) 2009 Elsevier Ltd. All rights reserved.", journal = "Polymer Degradation and Stability", title = "The influence of gamma radiation on the dielectric relaxation behaviour of isotactic polypropylene: The alpha relaxation", volume = "95", number = "2", pages = "164-171", doi = "10.1016/j.polymdegradstab.2009.11.034" }
Suljovrujić, E. H., Trifunovic, S.,& Miličević, D. S.. (2010). The influence of gamma radiation on the dielectric relaxation behaviour of isotactic polypropylene: The alpha relaxation. in Polymer Degradation and Stability, 95(2), 164-171. https://doi.org/10.1016/j.polymdegradstab.2009.11.034
Suljovrujić EH, Trifunovic S, Miličević DS. The influence of gamma radiation on the dielectric relaxation behaviour of isotactic polypropylene: The alpha relaxation. in Polymer Degradation and Stability. 2010;95(2):164-171. doi:10.1016/j.polymdegradstab.2009.11.034 .
Suljovrujić, Edin H., Trifunovic, S., Miličević, Dejan S., "The influence of gamma radiation on the dielectric relaxation behaviour of isotactic polypropylene: The alpha relaxation" in Polymer Degradation and Stability, 95, no. 2 (2010):164-171, https://doi.org/10.1016/j.polymdegradstab.2009.11.034 . .