TY  - JOUR
AU  - Todorović, Bratislav Ž.
AU  - Stojiljković, Dragan T.
AU  - Pantić-Petrović, Tanja
AU  - Matović, Branko
AU  - Prekajski-Đorđević, Marija D.
AU  - Petrović, Sanja M.
AU  - Stojiljković, Milena S.
AU  - Stevanović, Miloš M.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8493
AB  - There are no available data about direct burkeite formation on the geothermal waters pipelines in Europe. Data about accompanying minerals of burkeite are also scarce. This mineral has been found in the scale on pipelines of VG-2 and VG-3 boreholes at Vranjska Banja, Serbia. Geothermal waters from these boreholes have temperatures in the range of 103 and 105 °C which classifies them to the warmest waters in the continental Europe. Based on physicochemical and geochemical data, VG-2 and VG-3 geothermal waters can be classified as Na–Alk–SO4Cl type of waters. According to their temperatures, total hardness and pH values, these waters belong to hyperthermal, very soft and moderately alkaline. Calculated LSI (0.4 and 1.7) and RSI (6.5 and 4.8) values indicate their scale formation tendency. Results of the spectrometric scale examination from the pipe deposits provide a clear qualitative and quantitative burkeite characterization with its accompanying minerals. FTIR analysis points to the presence of carbonate (1766, 1458, 877 and 705 cm−1) and sulfate bands (1139, 1116 and 617 cm−1). Apart from the qualitative analysis, XRD also shows the burkeite mass part in the scale. VG-2 geothermal water contains about 50% of burkeite, which is associated with trona mineral (40%) and smaller amount of halite of about 10%. Burkeite is a dominant phase (> 60%) in VG-3 water, with the presence of a significant halite quantity (> 35%) and a minor calcite quantity (2%). © 2019, International Association for Mathematical Geosciences.
T2  - Natural Resources Research
T1  - Direct Formation of Burkeite in the Geothermal Waters at Vranjska Banja, Serbia
VL  - 28
IS  - 4
SP  - 1259
EP  - 1267
DO  - 10.1007/s11053-019-09455-y
ER  - 

@article{
author = "Todorović, Bratislav Ž. and Stojiljković, Dragan T. and Pantić-Petrović, Tanja and Matović, Branko and Prekajski-Đorđević, Marija D. and Petrović, Sanja M. and Stojiljković, Milena S. and Stevanović, Miloš M.",
year = "2019",
abstract = "There are no available data about direct burkeite formation on the geothermal waters pipelines in Europe. Data about accompanying minerals of burkeite are also scarce. This mineral has been found in the scale on pipelines of VG-2 and VG-3 boreholes at Vranjska Banja, Serbia. Geothermal waters from these boreholes have temperatures in the range of 103 and 105 °C which classifies them to the warmest waters in the continental Europe. Based on physicochemical and geochemical data, VG-2 and VG-3 geothermal waters can be classified as Na–Alk–SO4Cl type of waters. According to their temperatures, total hardness and pH values, these waters belong to hyperthermal, very soft and moderately alkaline. Calculated LSI (0.4 and 1.7) and RSI (6.5 and 4.8) values indicate their scale formation tendency. Results of the spectrometric scale examination from the pipe deposits provide a clear qualitative and quantitative burkeite characterization with its accompanying minerals. FTIR analysis points to the presence of carbonate (1766, 1458, 877 and 705 cm−1) and sulfate bands (1139, 1116 and 617 cm−1). Apart from the qualitative analysis, XRD also shows the burkeite mass part in the scale. VG-2 geothermal water contains about 50% of burkeite, which is associated with trona mineral (40%) and smaller amount of halite of about 10%. Burkeite is a dominant phase (> 60%) in VG-3 water, with the presence of a significant halite quantity (> 35%) and a minor calcite quantity (2%). © 2019, International Association for Mathematical Geosciences.",
journal = "Natural Resources Research",
title = "Direct Formation of Burkeite in the Geothermal Waters at Vranjska Banja, Serbia",
volume = "28",
number = "4",
pages = "1259-1267",
doi = "10.1007/s11053-019-09455-y"
}

Todorović, B. Ž., Stojiljković, D. T., Pantić-Petrović, T., Matović, B., Prekajski-Đorđević, M. D., Petrović, S. M., Stojiljković, M. S.,& Stevanović, M. M.. (2019). Direct Formation of Burkeite in the Geothermal Waters at Vranjska Banja, Serbia. in Natural Resources Research, 28(4), 1259-1267.
https://doi.org/10.1007/s11053-019-09455-y

Todorović BŽ, Stojiljković DT, Pantić-Petrović T, Matović B, Prekajski-Đorđević MD, Petrović SM, Stojiljković MS, Stevanović MM. Direct Formation of Burkeite in the Geothermal Waters at Vranjska Banja, Serbia. in Natural Resources Research. 2019;28(4):1259-1267.
doi:10.1007/s11053-019-09455-y .

Todorović, Bratislav Ž., Stojiljković, Dragan T., Pantić-Petrović, Tanja, Matović, Branko, Prekajski-Đorđević, Marija D., Petrović, Sanja M., Stojiljković, Milena S., Stevanović, Miloš M., "Direct Formation of Burkeite in the Geothermal Waters at Vranjska Banja, Serbia" in Natural Resources Research, 28, no. 4 (2019):1259-1267,
https://doi.org/10.1007/s11053-019-09455-y . .

TY  - JOUR
AU  - Cakić, Suzana M.
AU  - Ristić, Ivan S.
AU  - Marinović-Cincović, Milena
AU  - Stojiljković, Dragan T.
AU  - Csanadi, Janos J.
AU  - Cvetinov, Miroslav J.
AU  - Stamenkovic, Jakov V.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/352
AB  - Glycolysis of poly(ethylene terephthalate) (PET) waste using different molar ratio of poly(ethylene glycol) (PEG400), was used to produce saturated hydroxyl-functional polyester polyols with castor oil (CO) by transesterification process. The waterborne polyurethane (WBPU) adhesives were synthesized from these saturated polyester polyols, isophorone diisocyanate (IPDI), dimethylolpropionic acid (DMPA), and hexamethoxymethyl melamine (HMMM) as cross-linking agent by a conventional prepolymer process. The glycolyzed polyols and polyester polyos formations were characterized using Fourier transform infrared spectroscopy (FTIR) and the molecular weights were determined using gel permeation chromatography (GPC). The cross-linking reaction between WBPU and HMMM was verified using FfIR and H-1 NMR analysis. Thermal properties were investigated by thermogravimetric analysis (TG). Thermal stability of cross-linked WBPU significantly increased with decreasing castor oil content in the process of transesterification to obtain polyester polyol as a soft segment. The T-15% and T-50% (the temperature where 15 and 50% weight loss occurred) of WBPU increased with the decreasing of castor oil content in the obtained polyester polyols, caused by the steric hindrance of polyester polyol with higher castor oil content, in the process of cross-linking reactions with HMMM. The physico-mechanical properties of WBPU, such as hardness, adhesion test, and gloss of the dried films were also determined considering the effect of participation of HMMM in cross-linking reactions with polyurethane, on coating properties. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Progress in Organic Coatings
T1  - Glycolyzed poly(ethylene terephthalate) waste and castor oil-based polyols for waterborne polyurethane adhesives containing hexamethoxymethyl melamine
VL  - 78
SP  - 357
EP  - 368
DO  - 10.1016/j.porgcoat.2014.07.012
ER  - 

@article{
author = "Cakić, Suzana M. and Ristić, Ivan S. and Marinović-Cincović, Milena and Stojiljković, Dragan T. and Csanadi, Janos J. and Cvetinov, Miroslav J. and Stamenkovic, Jakov V.",
year = "2015",
abstract = "Glycolysis of poly(ethylene terephthalate) (PET) waste using different molar ratio of poly(ethylene glycol) (PEG400), was used to produce saturated hydroxyl-functional polyester polyols with castor oil (CO) by transesterification process. The waterborne polyurethane (WBPU) adhesives were synthesized from these saturated polyester polyols, isophorone diisocyanate (IPDI), dimethylolpropionic acid (DMPA), and hexamethoxymethyl melamine (HMMM) as cross-linking agent by a conventional prepolymer process. The glycolyzed polyols and polyester polyos formations were characterized using Fourier transform infrared spectroscopy (FTIR) and the molecular weights were determined using gel permeation chromatography (GPC). The cross-linking reaction between WBPU and HMMM was verified using FfIR and H-1 NMR analysis. Thermal properties were investigated by thermogravimetric analysis (TG). Thermal stability of cross-linked WBPU significantly increased with decreasing castor oil content in the process of transesterification to obtain polyester polyol as a soft segment. The T-15% and T-50% (the temperature where 15 and 50% weight loss occurred) of WBPU increased with the decreasing of castor oil content in the obtained polyester polyols, caused by the steric hindrance of polyester polyol with higher castor oil content, in the process of cross-linking reactions with HMMM. The physico-mechanical properties of WBPU, such as hardness, adhesion test, and gloss of the dried films were also determined considering the effect of participation of HMMM in cross-linking reactions with polyurethane, on coating properties. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Progress in Organic Coatings",
title = "Glycolyzed poly(ethylene terephthalate) waste and castor oil-based polyols for waterborne polyurethane adhesives containing hexamethoxymethyl melamine",
volume = "78",
pages = "357-368",
doi = "10.1016/j.porgcoat.2014.07.012"
}

Cakić, S. M., Ristić, I. S., Marinović-Cincović, M., Stojiljković, D. T., Csanadi, J. J., Cvetinov, M. J.,& Stamenkovic, J. V.. (2015). Glycolyzed poly(ethylene terephthalate) waste and castor oil-based polyols for waterborne polyurethane adhesives containing hexamethoxymethyl melamine. in Progress in Organic Coatings, 78, 357-368.
https://doi.org/10.1016/j.porgcoat.2014.07.012

Cakić SM, Ristić IS, Marinović-Cincović M, Stojiljković DT, Csanadi JJ, Cvetinov MJ, Stamenkovic JV. Glycolyzed poly(ethylene terephthalate) waste and castor oil-based polyols for waterborne polyurethane adhesives containing hexamethoxymethyl melamine. in Progress in Organic Coatings. 2015;78:357-368.
doi:10.1016/j.porgcoat.2014.07.012 .

Cakić, Suzana M., Ristić, Ivan S., Marinović-Cincović, Milena, Stojiljković, Dragan T., Csanadi, Janos J., Cvetinov, Miroslav J., Stamenkovic, Jakov V., "Glycolyzed poly(ethylene terephthalate) waste and castor oil-based polyols for waterborne polyurethane adhesives containing hexamethoxymethyl melamine" in Progress in Organic Coatings, 78 (2015):357-368,
https://doi.org/10.1016/j.porgcoat.2014.07.012 . .

TY  - JOUR
AU  - Cakić, Suzana M.
AU  - Ristić, Ivan S.
AU  - Marinović-Cincović, Milena
AU  - Nikolić, Nada Č.
AU  - Ilic, Olivera Z.
AU  - Stojiljković, Dragan T.
AU  - Budinski-Simendić, Jaroslava K.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4786
AB  - Soft drinks poly(ethylene terephthalate) (PET) bottles were depolymerized by glycolysis with different molar ratio of glycol, such as propylene glycol (PG), triethylene glycol (TEG) and poly(ethylene glycol) (PEG 400), in the presence of a zinc acetate catalyst. These glycolyzed products were characterized by hydroxyl value (HV) determinations. The obtained glycolyzed products were reacted with isophorone diisocyanate (IPDI), dimethylol propionic acid (DMPA), as potential ionic center for water dispersibility, and mixed with ethylene diamine (EDA) as extender chain to prepare polyurethane dispersions. The PET glycolyzed products and polyurethane formation were characterized using Fourier transform infrared spectroscopy (FTIR). The molecular masses distribution of oligoester polyol and polyurethane dispersions were determined by using gel permeation chromatography (G PC). The effect of different PET/glycol molar ratio, on the physico-mechanical properties, such as hardness, adhesion test and gloss of polyurethane films were investigated. Thermal properties were investigated by thermogravimetric analysis (TG) and differential scanning calorimetry (DSC). It was observed that initial degradation temperatures were at about 200 degrees C, with two-or three degradation steps. The influence of different molar ratio PET/glycol on DTG curves showed stages that were not noticeable in the appropriate weight loss curves. Polyurethane dispersions which lower molar ratio of PET/glycol in glycolyzed products showed lower thermal stability due to the presence of a greater amount of aromaticity in polyester backbone led to materials with higher film hardness. The values for the film adherence and gloss were confirmed their excellent properties for potential application for coatings in civil engineering, metal or polymer industry. (C) 2011 Elsevier B.V. All rights reserved.
T2  - Progress in Organic Coatings
T1  - Glycolyzed products from PET waste and their application in synthesis of polyurethane dispersions
VL  - 74
IS  - 1
SP  - 115
EP  - 124
DO  - 10.1016/j.porgcoat.2011.11.024
ER  - 

@article{
author = "Cakić, Suzana M. and Ristić, Ivan S. and Marinović-Cincović, Milena and Nikolić, Nada Č. and Ilic, Olivera Z. and Stojiljković, Dragan T. and Budinski-Simendić, Jaroslava K.",
year = "2012",
abstract = "Soft drinks poly(ethylene terephthalate) (PET) bottles were depolymerized by glycolysis with different molar ratio of glycol, such as propylene glycol (PG), triethylene glycol (TEG) and poly(ethylene glycol) (PEG 400), in the presence of a zinc acetate catalyst. These glycolyzed products were characterized by hydroxyl value (HV) determinations. The obtained glycolyzed products were reacted with isophorone diisocyanate (IPDI), dimethylol propionic acid (DMPA), as potential ionic center for water dispersibility, and mixed with ethylene diamine (EDA) as extender chain to prepare polyurethane dispersions. The PET glycolyzed products and polyurethane formation were characterized using Fourier transform infrared spectroscopy (FTIR). The molecular masses distribution of oligoester polyol and polyurethane dispersions were determined by using gel permeation chromatography (G PC). The effect of different PET/glycol molar ratio, on the physico-mechanical properties, such as hardness, adhesion test and gloss of polyurethane films were investigated. Thermal properties were investigated by thermogravimetric analysis (TG) and differential scanning calorimetry (DSC). It was observed that initial degradation temperatures were at about 200 degrees C, with two-or three degradation steps. The influence of different molar ratio PET/glycol on DTG curves showed stages that were not noticeable in the appropriate weight loss curves. Polyurethane dispersions which lower molar ratio of PET/glycol in glycolyzed products showed lower thermal stability due to the presence of a greater amount of aromaticity in polyester backbone led to materials with higher film hardness. The values for the film adherence and gloss were confirmed their excellent properties for potential application for coatings in civil engineering, metal or polymer industry. (C) 2011 Elsevier B.V. All rights reserved.",
journal = "Progress in Organic Coatings",
title = "Glycolyzed products from PET waste and their application in synthesis of polyurethane dispersions",
volume = "74",
number = "1",
pages = "115-124",
doi = "10.1016/j.porgcoat.2011.11.024"
}

Cakić, S. M., Ristić, I. S., Marinović-Cincović, M., Nikolić, N. Č., Ilic, O. Z., Stojiljković, D. T.,& Budinski-Simendić, J. K.. (2012). Glycolyzed products from PET waste and their application in synthesis of polyurethane dispersions. in Progress in Organic Coatings, 74(1), 115-124.
https://doi.org/10.1016/j.porgcoat.2011.11.024

Cakić SM, Ristić IS, Marinović-Cincović M, Nikolić NČ, Ilic OZ, Stojiljković DT, Budinski-Simendić JK. Glycolyzed products from PET waste and their application in synthesis of polyurethane dispersions. in Progress in Organic Coatings. 2012;74(1):115-124.
doi:10.1016/j.porgcoat.2011.11.024 .

Cakić, Suzana M., Ristić, Ivan S., Marinović-Cincović, Milena, Nikolić, Nada Č., Ilic, Olivera Z., Stojiljković, Dragan T., Budinski-Simendić, Jaroslava K., "Glycolyzed products from PET waste and their application in synthesis of polyurethane dispersions" in Progress in Organic Coatings, 74, no. 1 (2012):115-124,
https://doi.org/10.1016/j.porgcoat.2011.11.024 . .