TY  - JOUR
AU  - Kačarević-Popović, Zorica M.
AU  - Kostoski, Dušan
AU  - Novaković, L
AU  - Miljević, Nada R.
AU  - Šećerov, Bojana Lj.
PY  - 2004
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2857
AB  - Two types of polyethylene, low density (LDPE) and high density (HDPE), as well as low density polyethylene containing an antioxidant were subjected to gamma-irradiation in the presence of air and in water. The irradiated polymers were studied using IR spectrophotometric analysis. The radiation induced oxidative degradation was followed through the formation of oxygen containing groups by the development of bands in the 1850-1650 cm(-1) region and double bonds formation by the development of bands in the 1050-850 cm(-1) region. The crosslinking efficiency was determined by measuring the gel content by extraction with xylene. The radiation induced changes in the molecular structure, evolution of oxygen containing species and formation, of vinyl double bonds as well as of the crosslinking efficiency are discussed in terms of the properties of the polymers in an electric field of low strength.
T2  - Journal of the Serbian Chemical Society
T1  - Influence of the irradiation conditions on the effect of radiation on polyethylene
VL  - 69
IS  - 12
SP  - 1029
EP  - 1041
DO  - 10.2298/JSC0412029K
ER  - 

@article{
author = "Kačarević-Popović, Zorica M. and Kostoski, Dušan and Novaković, L and Miljević, Nada R. and Šećerov, Bojana Lj.",
year = "2004",
abstract = "Two types of polyethylene, low density (LDPE) and high density (HDPE), as well as low density polyethylene containing an antioxidant were subjected to gamma-irradiation in the presence of air and in water. The irradiated polymers were studied using IR spectrophotometric analysis. The radiation induced oxidative degradation was followed through the formation of oxygen containing groups by the development of bands in the 1850-1650 cm(-1) region and double bonds formation by the development of bands in the 1050-850 cm(-1) region. The crosslinking efficiency was determined by measuring the gel content by extraction with xylene. The radiation induced changes in the molecular structure, evolution of oxygen containing species and formation, of vinyl double bonds as well as of the crosslinking efficiency are discussed in terms of the properties of the polymers in an electric field of low strength.",
journal = "Journal of the Serbian Chemical Society",
title = "Influence of the irradiation conditions on the effect of radiation on polyethylene",
volume = "69",
number = "12",
pages = "1029-1041",
doi = "10.2298/JSC0412029K"
}

Kačarević-Popović, Z. M., Kostoski, D., Novaković, L., Miljević, N. R.,& Šećerov, B. Lj.. (2004). Influence of the irradiation conditions on the effect of radiation on polyethylene. in Journal of the Serbian Chemical Society, 69(12), 1029-1041.
https://doi.org/10.2298/JSC0412029K

Kačarević-Popović ZM, Kostoski D, Novaković L, Miljević NR, Šećerov BL. Influence of the irradiation conditions on the effect of radiation on polyethylene. in Journal of the Serbian Chemical Society. 2004;69(12):1029-1041.
doi:10.2298/JSC0412029K .

Kačarević-Popović, Zorica M., Kostoski, Dušan, Novaković, L, Miljević, Nada R., Šećerov, Bojana Lj., "Influence of the irradiation conditions on the effect of radiation on polyethylene" in Journal of the Serbian Chemical Society, 69, no. 12 (2004):1029-1041,
https://doi.org/10.2298/JSC0412029K . .

TY  - JOUR
AU  - Miličević, Dejan S.
AU  - Suljovrujić, Edin H.
AU  - Kostoski, Dušan
AU  - Spasovic, S
AU  - Novaković, L
PY  - 2004
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6442
AB  - The effects of high concentrations of polar aluminum trihydrate (ATH) molecules on the dielectric relaxations of low-density polyethylene (LDPE) have been studied by dielectric loss (tan delta) measurements in the temperature range from 25 to 370 K. It was found that there are strong effects of polar ATH molecules on alpha and beta relaxation peaks, but no effect on the gamma relaxation peak, which is usually attributed to the localized conformational changes such as crankshaft or kink motion of the main chain in amorphous-phase surface layers of LDPE. Both strong alpha and beta peaks are shifted to lower temperatures with increasing concentration of ATH in the polymer. This behavior of alpha and beta dielectric relaxations of LDPE was related to the morphological changes in the amorphous and the crystal phase of highly doped semicrystalline polymer.
T2  - Materials Science Forum
T1  - The effect of polar aluminium trihydrate molecules on the dielectric relaxations of low-density polyethylene
VL  - 453-454
SP  - 505
EP  - 508
DO  - 10.4028/www.scientific.net/MSF.453-454.505
ER  - 

@article{
author = "Miličević, Dejan S. and Suljovrujić, Edin H. and Kostoski, Dušan and Spasovic, S and Novaković, L",
year = "2004",
abstract = "The effects of high concentrations of polar aluminum trihydrate (ATH) molecules on the dielectric relaxations of low-density polyethylene (LDPE) have been studied by dielectric loss (tan delta) measurements in the temperature range from 25 to 370 K. It was found that there are strong effects of polar ATH molecules on alpha and beta relaxation peaks, but no effect on the gamma relaxation peak, which is usually attributed to the localized conformational changes such as crankshaft or kink motion of the main chain in amorphous-phase surface layers of LDPE. Both strong alpha and beta peaks are shifted to lower temperatures with increasing concentration of ATH in the polymer. This behavior of alpha and beta dielectric relaxations of LDPE was related to the morphological changes in the amorphous and the crystal phase of highly doped semicrystalline polymer.",
journal = "Materials Science Forum",
title = "The effect of polar aluminium trihydrate molecules on the dielectric relaxations of low-density polyethylene",
volume = "453-454",
pages = "505-508",
doi = "10.4028/www.scientific.net/MSF.453-454.505"
}

Miličević, D. S., Suljovrujić, E. H., Kostoski, D., Spasovic, S.,& Novaković, L.. (2004). The effect of polar aluminium trihydrate molecules on the dielectric relaxations of low-density polyethylene. in Materials Science Forum, 453-454, 505-508.
https://doi.org/10.4028/www.scientific.net/MSF.453-454.505

Miličević DS, Suljovrujić EH, Kostoski D, Spasovic S, Novaković L. The effect of polar aluminium trihydrate molecules on the dielectric relaxations of low-density polyethylene. in Materials Science Forum. 2004;453-454:505-508.
doi:10.4028/www.scientific.net/MSF.453-454.505 .

Miličević, Dejan S., Suljovrujić, Edin H., Kostoski, Dušan, Spasovic, S, Novaković, L, "The effect of polar aluminium trihydrate molecules on the dielectric relaxations of low-density polyethylene" in Materials Science Forum, 453-454 (2004):505-508,
https://doi.org/10.4028/www.scientific.net/MSF.453-454.505 . .

TY  - CONF
AU  - Kostoski, Dušan
AU  - Suljovrujić, Edin H.
AU  - Dijcilovic, J
AU  - Novaković, L
PY  - 2004
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6461
AB  - The effects of gamma irradiation in air and accelerated aging were studied through dielectric loss (tan delta) analysis in the temperature range from 25 to 325 K and using thermally stimulated discharge current measurements (TSDC). The radiation induced oxidation was observed using IR spectroscopy. The influence of radiation dose and accelerated aging on the intensities and the positions of the gamma and beta dielectric relaxation maxima were correlated with maxima of TSDC measuremens, and found to be strongly dependent upon the changes in the microstructure of the amorphous phase and on the surface of the crystallites induced by oxidation and crosslinking.
T1  - Effects of charge trapping in gamma irradiated and accelerated aged low-density polyethylene
SP  - 379
EP  - 382
DO  - 10.1109/ICSD.2004.1350370
ER  - 

@conference{
author = "Kostoski, Dušan and Suljovrujić, Edin H. and Dijcilovic, J and Novaković, L",
year = "2004",
abstract = "The effects of gamma irradiation in air and accelerated aging were studied through dielectric loss (tan delta) analysis in the temperature range from 25 to 325 K and using thermally stimulated discharge current measurements (TSDC). The radiation induced oxidation was observed using IR spectroscopy. The influence of radiation dose and accelerated aging on the intensities and the positions of the gamma and beta dielectric relaxation maxima were correlated with maxima of TSDC measuremens, and found to be strongly dependent upon the changes in the microstructure of the amorphous phase and on the surface of the crystallites induced by oxidation and crosslinking.",
title = "Effects of charge trapping in gamma irradiated and accelerated aged low-density polyethylene",
pages = "379-382",
doi = "10.1109/ICSD.2004.1350370"
}

Kostoski, D., Suljovrujić, E. H., Dijcilovic, J.,& Novaković, L.. (2004). Effects of charge trapping in gamma irradiated and accelerated aged low-density polyethylene. , 379-382.
https://doi.org/10.1109/ICSD.2004.1350370

Kostoski D, Suljovrujić EH, Dijcilovic J, Novaković L. Effects of charge trapping in gamma irradiated and accelerated aged low-density polyethylene. 2004;:379-382.
doi:10.1109/ICSD.2004.1350370 .

Kostoski, Dušan, Suljovrujić, Edin H., Dijcilovic, J, Novaković, L, "Effects of charge trapping in gamma irradiated and accelerated aged low-density polyethylene" (2004):379-382,
https://doi.org/10.1109/ICSD.2004.1350370 . .

TY  - JOUR
AU  - Milosavljević, B.H.
AU  - Novaković, L
PY  - 1999
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6269
AB  - Ultraviolet spectrum of 0.2 mm thick film of polypropylene containing 0.5% ORGANOX 1010 showed that in the sample prepared by slow cooling about 15% of the antioxidant reacted during the preparation process. The difference in turbidity between the samples obtained in the slow and the fast cooling process is attributed to the degree of crystallinity, which is in agreement with the DSC data. Very pronounced effects of the oxygen concentration and the degree of crystallinity on antioxidant uptake in irradiated polypropylene films were observed and discussed. It was also shown that a Febetron 707 pulsed electron accelerator is capable of producing both the single pulse dose (50 kGy) and the dose rate (2.5 TGy/s) large enough to enable a comparison of dose rate effects and LET effects in the study of the antioxidant reactions in polypropylene. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
T2  - Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
T1  - Antioxidant action in irradiated polypropylene studied by ultraviolet spectroscopy
VL  - 151
IS  - 1-4
SP  - 462
EP  - 466
DO  - 10.1016/S0168-583X(99)00097-X
ER  - 

@article{
author = "Milosavljević, B.H. and Novaković, L",
year = "1999",
abstract = "Ultraviolet spectrum of 0.2 mm thick film of polypropylene containing 0.5% ORGANOX 1010 showed that in the sample prepared by slow cooling about 15% of the antioxidant reacted during the preparation process. The difference in turbidity between the samples obtained in the slow and the fast cooling process is attributed to the degree of crystallinity, which is in agreement with the DSC data. Very pronounced effects of the oxygen concentration and the degree of crystallinity on antioxidant uptake in irradiated polypropylene films were observed and discussed. It was also shown that a Febetron 707 pulsed electron accelerator is capable of producing both the single pulse dose (50 kGy) and the dose rate (2.5 TGy/s) large enough to enable a comparison of dose rate effects and LET effects in the study of the antioxidant reactions in polypropylene. (C) 1999 Published by Elsevier Science B.V. All rights reserved.",
journal = "Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms",
title = "Antioxidant action in irradiated polypropylene studied by ultraviolet spectroscopy",
volume = "151",
number = "1-4",
pages = "462-466",
doi = "10.1016/S0168-583X(99)00097-X"
}

Milosavljević, B.H.,& Novaković, L.. (1999). Antioxidant action in irradiated polypropylene studied by ultraviolet spectroscopy. in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 151(1-4), 462-466.
https://doi.org/10.1016/S0168-583X(99)00097-X

Milosavljević B, Novaković L. Antioxidant action in irradiated polypropylene studied by ultraviolet spectroscopy. in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. 1999;151(1-4):462-466.
doi:10.1016/S0168-583X(99)00097-X .

Milosavljević, B.H., Novaković, L, "Antioxidant action in irradiated polypropylene studied by ultraviolet spectroscopy" in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 151, no. 1-4 (1999):462-466,
https://doi.org/10.1016/S0168-583X(99)00097-X . .