Effect of montmorillonite activation method on formaldehyde content in urea-formaldehyde composites
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2023
Authors
Kostić, MarijaSamaržija-Jovanović, Suzana

Ristić, Mirjana
Jovanović, Tijana
Jovanović, Vojislav

Marković, Gordana
Marinović-Cincović, Milena

Article (Published version)

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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 detecte...d 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.
Keywords:
Acid activation / Formaldehyde / Montmorillonite / Thermal stability / UF resinSource:
International Journal of Adhesion and Adhesives, 2023, 124, 103390-Funding / projects:
- Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 200123 (University of Priština - Kosovska Mitrovica, Faculty of Natural Sciences and Mathematics) (RS-200123)
- Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 200017 (University of Belgrade, Institute of Nuclear Sciences 'Vinča', Belgrade-Vinča) (RS-200017)
Institution/Community
VinčaTY - 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 . .