TY  - JOUR
AU  - Kostić, Marija
AU  - Samaržija-Jovanović, Suzana
AU  - Ristić, Mirjana
AU  - Jovanović, Tijana
AU  - Jovanović, Vojislav
AU  - Marković, Gordana
AU  - Marinović-Cincović, Milena
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10923
AB  - In this paper, the synthesis of modified urea-formaldehyde (UF) composites with differently activated montmorillonite KSF (UF/KSF) was performed. Two types of montmorillonite (MMT) KSF were used: sample activated with sulfuric acid-KSF(H2SO4) and sample activated with acid and stirring-KSF(H2SO4+stirrer). In order to examine the effect of KSF activation mode on the thermal and hydrolytic stability of UF resins, thermogravimetric analysis (TGA) was performed, as well as A determination of the amount of liberated formaldehyde (FA) after acid hydrolysis. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analysis were used to characterize the samples of modified UF/KSF composites and differently activated KSF. Activation of KSF led to a decrease in its specific surface area (SSA) and to an increase in cation exchange capacity (CEC). SEM analysis showed that in the KSF(H2SO4+stirrer) sample, the layered microstructure was disrupted. Free formaldehyde was not detected in the sample of UF resin with KSF(H2SO4), and in the sample with KSF(H2SO4+stirrer) it was 0.06%. The UF/KSF(H2SO4) composite showed higher hydrolytic stability (3.9%) compared to UF/KSF(H2SO4+stirrer) (4.62%), but lower compared to the UF/KSF(inactive) (1.23%). TG analysis showed that the KSF(H2SO4) sample had better thermal stability than the KSF(H2SO4+stirrer) sample, but this did not contribute to the better thermal stability of UF/KSF(H2SO4) compared to UF/KSF(H2SO4+stirrer), both samples had a T5% value of 112 °C.
T2  - International Journal of Adhesion and Adhesives
T1  - Effect of montmorillonite activation method on formaldehyde content in urea-formaldehyde composites
VL  - 124
SP  - 103390
DO  - 10.1016/j.ijadhadh.2023.103390
ER  - 

@article{
author = "Kostić, Marija and Samaržija-Jovanović, Suzana and Ristić, Mirjana and Jovanović, Tijana and Jovanović, Vojislav and Marković, Gordana and Marinović-Cincović, Milena",
year = "2023",
abstract = "In this paper, the synthesis of modified urea-formaldehyde (UF) composites with differently activated montmorillonite KSF (UF/KSF) was performed. Two types of montmorillonite (MMT) KSF were used: sample activated with sulfuric acid-KSF(H2SO4) and sample activated with acid and stirring-KSF(H2SO4+stirrer). In order to examine the effect of KSF activation mode on the thermal and hydrolytic stability of UF resins, thermogravimetric analysis (TGA) was performed, as well as A determination of the amount of liberated formaldehyde (FA) after acid hydrolysis. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analysis were used to characterize the samples of modified UF/KSF composites and differently activated KSF. Activation of KSF led to a decrease in its specific surface area (SSA) and to an increase in cation exchange capacity (CEC). SEM analysis showed that in the KSF(H2SO4+stirrer) sample, the layered microstructure was disrupted. Free formaldehyde was not detected in the sample of UF resin with KSF(H2SO4), and in the sample with KSF(H2SO4+stirrer) it was 0.06%. The UF/KSF(H2SO4) composite showed higher hydrolytic stability (3.9%) compared to UF/KSF(H2SO4+stirrer) (4.62%), but lower compared to the UF/KSF(inactive) (1.23%). TG analysis showed that the KSF(H2SO4) sample had better thermal stability than the KSF(H2SO4+stirrer) sample, but this did not contribute to the better thermal stability of UF/KSF(H2SO4) compared to UF/KSF(H2SO4+stirrer), both samples had a T5% value of 112 °C.",
journal = "International Journal of Adhesion and Adhesives",
title = "Effect of montmorillonite activation method on formaldehyde content in urea-formaldehyde composites",
volume = "124",
pages = "103390",
doi = "10.1016/j.ijadhadh.2023.103390"
}

Kostić, M., Samaržija-Jovanović, S., Ristić, M., Jovanović, T., Jovanović, V., Marković, G.,& Marinović-Cincović, M.. (2023). Effect of montmorillonite activation method on formaldehyde content in urea-formaldehyde composites. in International Journal of Adhesion and Adhesives, 124, 103390.
https://doi.org/10.1016/j.ijadhadh.2023.103390

Kostić M, Samaržija-Jovanović S, Ristić M, Jovanović T, Jovanović V, Marković G, Marinović-Cincović M. Effect of montmorillonite activation method on formaldehyde content in urea-formaldehyde composites. in International Journal of Adhesion and Adhesives. 2023;124:103390.
doi:10.1016/j.ijadhadh.2023.103390 .

Kostić, Marija, Samaržija-Jovanović, Suzana, Ristić, Mirjana, Jovanović, Tijana, Jovanović, Vojislav, Marković, Gordana, Marinović-Cincović, Milena, "Effect of montmorillonite activation method on formaldehyde content in urea-formaldehyde composites" in International Journal of Adhesion and Adhesives, 124 (2023):103390,
https://doi.org/10.1016/j.ijadhadh.2023.103390 . .

TY  - CONF
AU  - Ristić, Mirjana
AU  - Samaržija-Jovanović, Suzana
AU  - Jovanović, Vojislav
AU  - Kostić, Marija
AU  - Jovanović, Tijana
AU  - Marković, Gordana
AU  - Marinović-Cincović, Milena
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12248
AB  - The effect of different montmorillonites (KSF and K10) and their modifications (Na-KSF, Na-K10) on content of formaldehyde-FA (free and liberated) modified urea-formaldehyde (UF) composites was investigated. KSF and K10 were modified by sodium chloride (NaCl). A total of four samples were synthesized, with the designations UF/KSF, UF/Na-KSF, UF/K10, and UF/Na-K10, under the same conditions. The content of free FA was determined by the bisulfite method. The hydrolytic stability of modified UF resin was determined by measuring the concentration of liberated FA of modified UF composites after acid hydrolysis. The specific surface area of the tested montmorillonites was determined by the Sear's method. Higher values of specific surface area were obtained for pure KSF (149.4 m2/g) compared to modified Na-KSF (48.6 m2/g). Specific surface area for pure K10 was 111 m 2/g, compared to value of 71 m2/g for modified Na-K10. The amount of free and liberated FA was 0.4%, 0.12% and 1.2% and 2.3%, respectively for UF/KSF and UF/Na-KSF composite. The values for free FA for UF/K10 and UF/Na-K10 composite are the same and amount to 0.6%. It was concluded that the UF/Na-KSF composite has a smaller content of free FA (0.12%) compared to other UF composites. The UF/KSF composite has a higher resistance to acidic hydrolysis and lower liberated FA percent (1.2%).
PB  - Novi Sad : University of Novi Sad, Faculty of Technology
C3  - 2nd International Conference on Advanced Production and Processing : the book of abstracts; Oct 20-22, Novi Sad
T1  - Influence of modified montmorillonites on formaldehyde content in urea-formaldehyde/montmorillonite composites
SP  - 122
EP  - 122
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12248
ER  - 

@conference{
author = "Ristić, Mirjana and Samaržija-Jovanović, Suzana and Jovanović, Vojislav and Kostić, Marija and Jovanović, Tijana and Marković, Gordana and Marinović-Cincović, Milena",
year = "2022",
abstract = "The effect of different montmorillonites (KSF and K10) and their modifications (Na-KSF, Na-K10) on content of formaldehyde-FA (free and liberated) modified urea-formaldehyde (UF) composites was investigated. KSF and K10 were modified by sodium chloride (NaCl). A total of four samples were synthesized, with the designations UF/KSF, UF/Na-KSF, UF/K10, and UF/Na-K10, under the same conditions. The content of free FA was determined by the bisulfite method. The hydrolytic stability of modified UF resin was determined by measuring the concentration of liberated FA of modified UF composites after acid hydrolysis. The specific surface area of the tested montmorillonites was determined by the Sear's method. Higher values of specific surface area were obtained for pure KSF (149.4 m2/g) compared to modified Na-KSF (48.6 m2/g). Specific surface area for pure K10 was 111 m 2/g, compared to value of 71 m2/g for modified Na-K10. The amount of free and liberated FA was 0.4%, 0.12% and 1.2% and 2.3%, respectively for UF/KSF and UF/Na-KSF composite. The values for free FA for UF/K10 and UF/Na-K10 composite are the same and amount to 0.6%. It was concluded that the UF/Na-KSF composite has a smaller content of free FA (0.12%) compared to other UF composites. The UF/KSF composite has a higher resistance to acidic hydrolysis and lower liberated FA percent (1.2%).",
publisher = "Novi Sad : University of Novi Sad, Faculty of Technology",
journal = "2nd International Conference on Advanced Production and Processing : the book of abstracts; Oct 20-22, Novi Sad",
title = "Influence of modified montmorillonites on formaldehyde content in urea-formaldehyde/montmorillonite composites",
pages = "122-122",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12248"
}

Ristić, M., Samaržija-Jovanović, S., Jovanović, V., Kostić, M., Jovanović, T., Marković, G.,& Marinović-Cincović, M.. (2022). Influence of modified montmorillonites on formaldehyde content in urea-formaldehyde/montmorillonite composites. in 2nd International Conference on Advanced Production and Processing : the book of abstracts; Oct 20-22, Novi Sad
Novi Sad : University of Novi Sad, Faculty of Technology., 122-122.
https://hdl.handle.net/21.15107/rcub_vinar_12248

Ristić M, Samaržija-Jovanović S, Jovanović V, Kostić M, Jovanović T, Marković G, Marinović-Cincović M. Influence of modified montmorillonites on formaldehyde content in urea-formaldehyde/montmorillonite composites. in 2nd International Conference on Advanced Production and Processing : the book of abstracts; Oct 20-22, Novi Sad. 2022;:122-122.
https://hdl.handle.net/21.15107/rcub_vinar_12248 .

Ristić, Mirjana, Samaržija-Jovanović, Suzana, Jovanović, Vojislav, Kostić, Marija, Jovanović, Tijana, Marković, Gordana, Marinović-Cincović, Milena, "Influence of modified montmorillonites on formaldehyde content in urea-formaldehyde/montmorillonite composites" in 2nd International Conference on Advanced Production and Processing : the book of abstracts; Oct 20-22, Novi Sad (2022):122-122,
https://hdl.handle.net/21.15107/rcub_vinar_12248 .