TY  - JOUR
AU  - Cakić, Suzana
AU  - Lačnjevac, Časlav
AU  - Rajković, Miloš
AU  - Rasković, Ljiljana
AU  - Stamenković, Jakov
PY  - 2011
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2538
AB  - The DSC method has been employed to monitor the kinetics of reticulation of aqueous polyurethane systems without catalysts, and with the commercial catalyst of zirconium (CAT®XC-6212) and the highly selective manganese catalyst, the complex Mn (III)-diacetylacetonemaleinate (MAM). Among the polyol components, the acrylic emulsions were used for reticulation in this research, and as suitable reticulation agents the water emulsible aliphatic polyisocyanates based on hexamethylendoisocyanate with the different contents of NCO-groups were employed. On the basis of DSC analysis, applying the methods of Kissinger, Freeman-Carroll and Crane-Ellerstein the pseudo kinetic parameters of the reticulation reaction of aqueous systems were determined. The temperature range of the examination was from 500C to 4500C with the heat rate of 0.50C/min. The reduction of the activation energy and the increase of the standard deviation indicate the catalytic action of the selective catalysts of zirconium and manganese. The impact of the catalysts on the reduction of the activation energy is the strongest when using the catalysts of manganese and applying all the three afore-said methods. The least aberrations among the stated methods in defining the kinetic parameters were obtained by using the manganese catalyst.
AB  - DSC metodom praćena je kinetika umrežavanja vodenih poliuretankih sistema, bez katalizatora, sa komercijalnim katalizatorom cirkonijuma (KAT®XC-6212) i visokoselektivnim manganovim katalizatorom, kompleksom Mn(III) - diacetilacetonatomaleinatom (MAM). U ovom radu za umrežavanje od poliolnih komponenti korišćene su akrilne emulzije a kao pogodni umreživači koričćeni su vodoemulgujući alifatični poliizocijanati na bazi heksametilendiizocijanata sa različitim sadržajem NCO-grupa. Na osnovu DSC-analize, metodama Kissinger-a, Freeman-Carrollaa i Crane-Ellerstein-a, određeni su prividni kinetički parametri reakcije umrežavanja vodenih sistema. Temperaturni opseg ispitivanja koričćen je od 50 do 450oC sa brzinom grejanja od 0.5oC/min. Smanjenje energije aktivacije i povećanje standardne devijacije ukazuju na katalitičko dejstvo selektivnih katalizatora cirkonijuma i mangana. Učešće katalizatora u smanjenju energije aktivacije je najveće kod katalizatora mangana, korišćenjem sve tri bbbmetode izračunavanja kod ispitivanih uzoraka u odnosu na cirkonijumov katalizator. Najmanja odsupanja između pomenutih metoda u određvanju kinetičkih parametara dobijena su korišćenjem manganovog katalizatora.
PB  - Inženjersko društvo za koroziju, Beograd
T2  - Zaštita materijala
T1  - Reticulation of aqueous polyurethane systems
T1  - Proces umrežavanja vodenih poliuretanskih sistema
EP  - 48
IS  - 1
SP  - 43
VL  - 52
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_2538
ER  - 

@article{
author = "Cakić, Suzana and Lačnjevac, Časlav and Rajković, Miloš and Rasković, Ljiljana and Stamenković, Jakov",
year = "2011",
abstract = "The DSC method has been employed to monitor the kinetics of reticulation of aqueous polyurethane systems without catalysts, and with the commercial catalyst of zirconium (CAT®XC-6212) and the highly selective manganese catalyst, the complex Mn (III)-diacetylacetonemaleinate (MAM). Among the polyol components, the acrylic emulsions were used for reticulation in this research, and as suitable reticulation agents the water emulsible aliphatic polyisocyanates based on hexamethylendoisocyanate with the different contents of NCO-groups were employed. On the basis of DSC analysis, applying the methods of Kissinger, Freeman-Carroll and Crane-Ellerstein the pseudo kinetic parameters of the reticulation reaction of aqueous systems were determined. The temperature range of the examination was from 500C to 4500C with the heat rate of 0.50C/min. The reduction of the activation energy and the increase of the standard deviation indicate the catalytic action of the selective catalysts of zirconium and manganese. The impact of the catalysts on the reduction of the activation energy is the strongest when using the catalysts of manganese and applying all the three afore-said methods. The least aberrations among the stated methods in defining the kinetic parameters were obtained by using the manganese catalyst., DSC metodom praćena je kinetika umrežavanja vodenih poliuretankih sistema, bez katalizatora, sa komercijalnim katalizatorom cirkonijuma (KAT®XC-6212) i visokoselektivnim manganovim katalizatorom, kompleksom Mn(III) - diacetilacetonatomaleinatom (MAM). U ovom radu za umrežavanje od poliolnih komponenti korišćene su akrilne emulzije a kao pogodni umreživači koričćeni su vodoemulgujući alifatični poliizocijanati na bazi heksametilendiizocijanata sa različitim sadržajem NCO-grupa. Na osnovu DSC-analize, metodama Kissinger-a, Freeman-Carrollaa i Crane-Ellerstein-a, određeni su prividni kinetički parametri reakcije umrežavanja vodenih sistema. Temperaturni opseg ispitivanja koričćen je od 50 do 450oC sa brzinom grejanja od 0.5oC/min. Smanjenje energije aktivacije i povećanje standardne devijacije ukazuju na katalitičko dejstvo selektivnih katalizatora cirkonijuma i mangana. Učešće katalizatora u smanjenju energije aktivacije je najveće kod katalizatora mangana, korišćenjem sve tri bbbmetode izračunavanja kod ispitivanih uzoraka u odnosu na cirkonijumov katalizator. Najmanja odsupanja između pomenutih metoda u određvanju kinetičkih parametara dobijena su korišćenjem manganovog katalizatora.",
publisher = "Inženjersko društvo za koroziju, Beograd",
journal = "Zaštita materijala",
title = "Reticulation of aqueous polyurethane systems, Proces umrežavanja vodenih poliuretanskih sistema",
pages = "48-43",
number = "1",
volume = "52",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_2538"
}

Cakić, S., Lačnjevac, Č., Rajković, M., Rasković, L.,& Stamenković, J.. (2011). Reticulation of aqueous polyurethane systems. in Zaštita materijala
Inženjersko društvo za koroziju, Beograd., 52(1), 43-48.
https://hdl.handle.net/21.15107/rcub_agrospace_2538

Cakić S, Lačnjevac Č, Rajković M, Rasković L, Stamenković J. Reticulation of aqueous polyurethane systems. in Zaštita materijala. 2011;52(1):43-48.
https://hdl.handle.net/21.15107/rcub_agrospace_2538 .

Cakić, Suzana, Lačnjevac, Časlav, Rajković, Miloš, Rasković, Ljiljana, Stamenković, Jakov, "Reticulation of aqueous polyurethane systems" in Zaštita materijala, 52, no. 1 (2011):43-48,
https://hdl.handle.net/21.15107/rcub_agrospace_2538 .

TY  - JOUR
AU  - Cakić, Suzana
AU  - Lačnjevac, Časlav
AU  - Stamenković, Jakov
AU  - Ristić, Nikola
AU  - Takić, Ljiljana
AU  - Barać, Miroljub
AU  - Gligorić, Miladin
PY  - 2007
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/1539
AB  - Two kinds of aqueous acrylic polyols (single step and multi step synthesis type) have been investigated for their performance in the two-component aqueous polyurethane application, by using more selective catalysts. The aliphatic polyfunctional isocyanates based on hexamethylen diisocyanates have been employed as suitable hardeners. The complex of zirconium, commercially known as K-KAT(R)XC-6212, and manganese (III) complexes with mixed ligands based on the derivative of maleic acid have been used as catalysts in this study. Both of the aqueous polyols give good results, in terms of application and hardness, when elevated temperatures and more selective catalysts are applied. A more selective catalyst promotes the reaction between the isocyanate and polyol component. This increases the percentage of urethane bonds and the degree of hardness in the films formed from the two components of aqueous polyurethane lacquers. The polyol based on the single step synthesis route is favourable concerning potlife and hardness. The obtained results show that the performance of the two-component aqueous polyurethane coatings depends on the polymer structure of the polyols as well as on the selectivity of the employed catalyst.
PB  - MDPI, BASEL
T2  - Sensors
T1  - Effects of the acrylic polyol structure and the selectivity of the employed catalyst on the performance of two-component aqueous polyurethane coatings
EP  - 318
IS  - 3
SP  - 308
VL  - 7
DO  - 10.3390/s7030308
ER  - 

@article{
author = "Cakić, Suzana and Lačnjevac, Časlav and Stamenković, Jakov and Ristić, Nikola and Takić, Ljiljana and Barać, Miroljub and Gligorić, Miladin",
year = "2007",
abstract = "Two kinds of aqueous acrylic polyols (single step and multi step synthesis type) have been investigated for their performance in the two-component aqueous polyurethane application, by using more selective catalysts. The aliphatic polyfunctional isocyanates based on hexamethylen diisocyanates have been employed as suitable hardeners. The complex of zirconium, commercially known as K-KAT(R)XC-6212, and manganese (III) complexes with mixed ligands based on the derivative of maleic acid have been used as catalysts in this study. Both of the aqueous polyols give good results, in terms of application and hardness, when elevated temperatures and more selective catalysts are applied. A more selective catalyst promotes the reaction between the isocyanate and polyol component. This increases the percentage of urethane bonds and the degree of hardness in the films formed from the two components of aqueous polyurethane lacquers. The polyol based on the single step synthesis route is favourable concerning potlife and hardness. The obtained results show that the performance of the two-component aqueous polyurethane coatings depends on the polymer structure of the polyols as well as on the selectivity of the employed catalyst.",
publisher = "MDPI, BASEL",
journal = "Sensors",
title = "Effects of the acrylic polyol structure and the selectivity of the employed catalyst on the performance of two-component aqueous polyurethane coatings",
pages = "318-308",
number = "3",
volume = "7",
doi = "10.3390/s7030308"
}

Cakić, S., Lačnjevac, Č., Stamenković, J., Ristić, N., Takić, L., Barać, M.,& Gligorić, M.. (2007). Effects of the acrylic polyol structure and the selectivity of the employed catalyst on the performance of two-component aqueous polyurethane coatings. in Sensors
MDPI, BASEL., 7(3), 308-318.
https://doi.org/10.3390/s7030308

Cakić S, Lačnjevac Č, Stamenković J, Ristić N, Takić L, Barać M, Gligorić M. Effects of the acrylic polyol structure and the selectivity of the employed catalyst on the performance of two-component aqueous polyurethane coatings. in Sensors. 2007;7(3):308-318.
doi:10.3390/s7030308 .

Cakić, Suzana, Lačnjevac, Časlav, Stamenković, Jakov, Ristić, Nikola, Takić, Ljiljana, Barać, Miroljub, Gligorić, Miladin, "Effects of the acrylic polyol structure and the selectivity of the employed catalyst on the performance of two-component aqueous polyurethane coatings" in Sensors, 7, no. 3 (2007):308-318,
https://doi.org/10.3390/s7030308 . .

TY  - JOUR
AU  - Cakić, Suzana
AU  - Nikolić, Goran
AU  - Lačnjevac, Časlav
AU  - Gligorić, Miladin
AU  - Stamenković, Jakov
AU  - Rajković, Miloš
AU  - Barać, Miroljub
PY  - 2006
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/1352
AB  - The thermal stability of aqueous polyurethanes has been measured applying the thermogravimetric analysis. The aqueous polyurethanes (aqPUR) with catalysts of different selectivity have been studied by use of the dynamic method. To obtain degradations of 0.025, 0.05, and 0.10, employing the dynamic method, the heating rates of 0.5, 1, 2, 5, and 10 degrees C min(-1) have been used in the range of 30-500 degrees C. Using the more selective catalysts in the aqueous polyurethanes, the total resulting time of the decompositon has been on the increase at all degrees of the degradation and at the particular starting temperature. This paper shows that the dynamic method based on the thermogravimetric analysis can be used to assess the thermal stability of the aqueous polyurethanes using the catalysts of different selectivity.
PB  - MDPI, BASEL
T2  - Sensors
T1  - Thermal stability of aqueous polyurethanes depending on the applied catalysts
EP  - 1707
IS  - 11
SP  - 1697
VL  - 6
DO  - 10.3390/s6111697
ER  - 

@article{
author = "Cakić, Suzana and Nikolić, Goran and Lačnjevac, Časlav and Gligorić, Miladin and Stamenković, Jakov and Rajković, Miloš and Barać, Miroljub",
year = "2006",
abstract = "The thermal stability of aqueous polyurethanes has been measured applying the thermogravimetric analysis. The aqueous polyurethanes (aqPUR) with catalysts of different selectivity have been studied by use of the dynamic method. To obtain degradations of 0.025, 0.05, and 0.10, employing the dynamic method, the heating rates of 0.5, 1, 2, 5, and 10 degrees C min(-1) have been used in the range of 30-500 degrees C. Using the more selective catalysts in the aqueous polyurethanes, the total resulting time of the decompositon has been on the increase at all degrees of the degradation and at the particular starting temperature. This paper shows that the dynamic method based on the thermogravimetric analysis can be used to assess the thermal stability of the aqueous polyurethanes using the catalysts of different selectivity.",
publisher = "MDPI, BASEL",
journal = "Sensors",
title = "Thermal stability of aqueous polyurethanes depending on the applied catalysts",
pages = "1707-1697",
number = "11",
volume = "6",
doi = "10.3390/s6111697"
}

Cakić, S., Nikolić, G., Lačnjevac, Č., Gligorić, M., Stamenković, J., Rajković, M.,& Barać, M.. (2006). Thermal stability of aqueous polyurethanes depending on the applied catalysts. in Sensors
MDPI, BASEL., 6(11), 1697-1707.
https://doi.org/10.3390/s6111697

Cakić S, Nikolić G, Lačnjevac Č, Gligorić M, Stamenković J, Rajković M, Barać M. Thermal stability of aqueous polyurethanes depending on the applied catalysts. in Sensors. 2006;6(11):1697-1707.
doi:10.3390/s6111697 .

Cakić, Suzana, Nikolić, Goran, Lačnjevac, Časlav, Gligorić, Miladin, Stamenković, Jakov, Rajković, Miloš, Barać, Miroljub, "Thermal stability of aqueous polyurethanes depending on the applied catalysts" in Sensors, 6, no. 11 (2006):1697-1707,
https://doi.org/10.3390/s6111697 . .

TY  - JOUR
AU  - Cakić, Suzana
AU  - Lačnjevac, Časlav
AU  - Nikolić, Goran
AU  - Stamenković, Jakov
AU  - Rajković, Miloš
AU  - Gligorić, Miladin
AU  - Barać, Miroljub
PY  - 2006
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/1338
AB  - The latest investigations on producing more efficient catalytic aqueous polyurethane systems are in the domain of metal complexes with mixed ligands. In our previous research works, the high selectivity for the isocyanate-hydroxyl reaction in aqueous polyurethane systems has been shown by the manganese(III) mixed-ligand complexes. The two new complexes have been prepared with two acetylacetonate (acac) ligands and one maleate ligand and its hydroxylamine derivative of the general formula [Mn(C5H7O2)(2)L]. Their structures have been established by using the fundamental analyses, the FTIR and UV/VIS spectroscopic methods, as well as the magnetic measurements. In order to explain the different selectivity of the manganese(III) mixed-ligand complexes, the UV and ESR spectroscopy have been employed to determine the kinetics of the complexes' decomposition. The thermal stability of the complexes has been determined by way of the dynamic TG method at the heating rate of 5 degrees C.min(-1) and at the temperature ranged 20-550 degrees C. It suggests the decomposition of the complexes by loss of acid ligand. The main factor in the selective catalysis control in the aqueous polyurethane systems is the nature of the acid ligands and their impact on the manganese(II)/manganese(III) equilibrium.
PB  - MDPI, BASEL
T2  - Sensors
T1  - Spectroscopic characteristics of highly selective manganese catalysis in acqueous polyurethane systems
EP  - 1720
IS  - 11
SP  - 1708
VL  - 6
DO  - 10.3390/s6111708
ER  - 

@article{
author = "Cakić, Suzana and Lačnjevac, Časlav and Nikolić, Goran and Stamenković, Jakov and Rajković, Miloš and Gligorić, Miladin and Barać, Miroljub",
year = "2006",
abstract = "The latest investigations on producing more efficient catalytic aqueous polyurethane systems are in the domain of metal complexes with mixed ligands. In our previous research works, the high selectivity for the isocyanate-hydroxyl reaction in aqueous polyurethane systems has been shown by the manganese(III) mixed-ligand complexes. The two new complexes have been prepared with two acetylacetonate (acac) ligands and one maleate ligand and its hydroxylamine derivative of the general formula [Mn(C5H7O2)(2)L]. Their structures have been established by using the fundamental analyses, the FTIR and UV/VIS spectroscopic methods, as well as the magnetic measurements. In order to explain the different selectivity of the manganese(III) mixed-ligand complexes, the UV and ESR spectroscopy have been employed to determine the kinetics of the complexes' decomposition. The thermal stability of the complexes has been determined by way of the dynamic TG method at the heating rate of 5 degrees C.min(-1) and at the temperature ranged 20-550 degrees C. It suggests the decomposition of the complexes by loss of acid ligand. The main factor in the selective catalysis control in the aqueous polyurethane systems is the nature of the acid ligands and their impact on the manganese(II)/manganese(III) equilibrium.",
publisher = "MDPI, BASEL",
journal = "Sensors",
title = "Spectroscopic characteristics of highly selective manganese catalysis in acqueous polyurethane systems",
pages = "1720-1708",
number = "11",
volume = "6",
doi = "10.3390/s6111708"
}

Cakić, S., Lačnjevac, Č., Nikolić, G., Stamenković, J., Rajković, M., Gligorić, M.,& Barać, M.. (2006). Spectroscopic characteristics of highly selective manganese catalysis in acqueous polyurethane systems. in Sensors
MDPI, BASEL., 6(11), 1708-1720.
https://doi.org/10.3390/s6111708

Cakić S, Lačnjevac Č, Nikolić G, Stamenković J, Rajković M, Gligorić M, Barać M. Spectroscopic characteristics of highly selective manganese catalysis in acqueous polyurethane systems. in Sensors. 2006;6(11):1708-1720.
doi:10.3390/s6111708 .

Cakić, Suzana, Lačnjevac, Časlav, Nikolić, Goran, Stamenković, Jakov, Rajković, Miloš, Gligorić, Miladin, Barać, Miroljub, "Spectroscopic characteristics of highly selective manganese catalysis in acqueous polyurethane systems" in Sensors, 6, no. 11 (2006):1708-1720,
https://doi.org/10.3390/s6111708 . .

TY  - JOUR
AU  - Cakić, Suzana
AU  - Lačnjevac, Časlav
AU  - Rajković, Miloš
AU  - Rasković, Ljiljana
AU  - Stamenković, Jakov
PY  - 2006
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/1348
AB  - The DSC method has been employed to monitor the kinetics of reticulation of aqueous polyurethane systems without catalysts, and with the commercial catalyst of zirconium (CAT(R) XC- 6212) and the highly selective manganese catalyst, the complex Mn(III)diacetylacetonemaleinate (MAM). Among the polyol components, the acrylic emulsions were used for reticulation in this research, and as suitable reticulation agents the water emulsible aliphatic polyisocyanates based on hexamethylendoisocyanate with the different contents of NCO-groups were employed. On the basis of DSC analysis, applying the methods of Kissinger, Freeman-Carroll and Crane-Ellerstein the pseudo kinetic parameters of the reticulation reaction of aqueous systems were determined. The temperature of the examination ranged from 50 degrees C to 450 degrees C with the heat rate of 0.5 degrees C/min. The reduction of the activation energy and the increase of the standard deviation indicate the catalytic action of the selective catalysts of zirconium and manganese. The impact of the catalysts on the reduction of the activation energy is the strongest when using the catalysts of manganese and applying all the three afore-said methods. The least aberrations among the stated methods in defining the kinetic parameters were obtained by using the manganese catalyst.
PB  - MDPI, BASEL
T2  - Sensors
T1  - Reticulation of aqueous polyurethane systems controlled by DSC method
EP  - 545
IS  - 5
SP  - 536
VL  - 6
DO  - 10.3390/s6050536
ER  - 

@article{
author = "Cakić, Suzana and Lačnjevac, Časlav and Rajković, Miloš and Rasković, Ljiljana and Stamenković, Jakov",
year = "2006",
abstract = "The DSC method has been employed to monitor the kinetics of reticulation of aqueous polyurethane systems without catalysts, and with the commercial catalyst of zirconium (CAT(R) XC- 6212) and the highly selective manganese catalyst, the complex Mn(III)diacetylacetonemaleinate (MAM). Among the polyol components, the acrylic emulsions were used for reticulation in this research, and as suitable reticulation agents the water emulsible aliphatic polyisocyanates based on hexamethylendoisocyanate with the different contents of NCO-groups were employed. On the basis of DSC analysis, applying the methods of Kissinger, Freeman-Carroll and Crane-Ellerstein the pseudo kinetic parameters of the reticulation reaction of aqueous systems were determined. The temperature of the examination ranged from 50 degrees C to 450 degrees C with the heat rate of 0.5 degrees C/min. The reduction of the activation energy and the increase of the standard deviation indicate the catalytic action of the selective catalysts of zirconium and manganese. The impact of the catalysts on the reduction of the activation energy is the strongest when using the catalysts of manganese and applying all the three afore-said methods. The least aberrations among the stated methods in defining the kinetic parameters were obtained by using the manganese catalyst.",
publisher = "MDPI, BASEL",
journal = "Sensors",
title = "Reticulation of aqueous polyurethane systems controlled by DSC method",
pages = "545-536",
number = "5",
volume = "6",
doi = "10.3390/s6050536"
}

Cakić, S., Lačnjevac, Č., Rajković, M., Rasković, L.,& Stamenković, J.. (2006). Reticulation of aqueous polyurethane systems controlled by DSC method. in Sensors
MDPI, BASEL., 6(5), 536-545.
https://doi.org/10.3390/s6050536

Cakić S, Lačnjevac Č, Rajković M, Rasković L, Stamenković J. Reticulation of aqueous polyurethane systems controlled by DSC method. in Sensors. 2006;6(5):536-545.
doi:10.3390/s6050536 .

Cakić, Suzana, Lačnjevac, Časlav, Rajković, Miloš, Rasković, Ljiljana, Stamenković, Jakov, "Reticulation of aqueous polyurethane systems controlled by DSC method" in Sensors, 6, no. 5 (2006):536-545,
https://doi.org/10.3390/s6050536 . .