HYDROLYTIC AND THERMAL STABILITY OF UREA-FORMALDEHYDE COMPOSITES BASED ON CHITOSAN AND ZEOLITE ZSM-5

17th International Conference on Fundamental and Applied Aspects of Physical Chemistry (Proceedings, Volume II) (2024) [M-03-P, pp. 565-568]       

AUTHOR(S) / АУТОР(И): Mirjana Ristić , Suzana Samaržija-Jovanović , Tijana Jovanović , Marija Krstić , Branka B. Petković , Vojislav Jovanović  and Milena Marinović-Cincović

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DOI: 10.46793/Phys.Chem24II.565R

ABSTRACT / САЖЕТАК:

In this work, a comparative investigation of the hydrolytic and thermal stability of urea- formaldehyde (UF) resins modified with chitosan (UF/H) and zeolite (UF/Z) was performed. Zeolite ZSM-5 and chitosan were used to modify the in situ synthesized UF resin with a low formaldehyde/urea (FA/U) molar ratio (0.8), to reduce the free FA content in the UF resin. The disulfite method determined free and released FA from the synthesized composites. The modified UF composites were characterized using TG/DTG, and SEM. The results showed that chitosan and zeolite are good scavengers of FA from cross-linked modified UF composites. Both tested composites have the same content of free FA (0.06%). The UF/H composite is hydrolytically more stable because it has a lower content of released FA (2.52%), after acid hydrolysis, compared to the UF/Z composite (4.08%). On the other hand, the UF/Z composite proved to be thermally more stable (T5%= 205.4oC) than the UF/Z composite (T5%= 91.9oC).

KEYWORDS / КЉУЧНЕ РЕЧИ:

ACKNOWLEDGEMENT / ПРОЈЕКАТ:

This work was supported by the Ministry of Science, Technological Development and Innovation of the Republic of Serbia (contract number 451-03-65/2024-03/200123, 451-03-66/2024-03/200017, 451-03-66/2024-03/200124 and 451-03-66/2024-03/ 200134), and Faculty of Sciences and Mathematics, University of Priština in Kosovska Mitrovica, Serbia (contract number IJ-2301).

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