Hidrotermična depolimerizacija polikarbonata s steklenimi vlakni : diplomsko delo

Pucelj, Sara

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Title:	Hidrotermična depolimerizacija polikarbonata s steklenimi vlakni : diplomsko delo
Authors:	ID Pucelj, Sara (Author) ID Škerget, Mojca (Mentor) More about this mentor... ID Čolnik, Maja (Comentor)
Files:	VS_Pucelj_Sara_2025.pdf (2,05 MB) MD5: 42B76CB780B5165408095FF1A237174B
Language:	Slovenian
Work type:	Bachelor thesis/paper
Typology:	2.11 - Undergraduate Thesis
Organization:	FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:	Diplomsko delo obravnava hidrotermično depolimerizacijo polikarbonata, ojačanega s steklenimi vlakni (GFPC) z uporabo podkritične vode. Eksperimenti so bili izvedeni v visokotlačnem in visokotemperaturnem šaržnem reaktorju pri temperaturah 250 °C, 300 °C in 350 °C ter reakcijskih časih od 5 do 120 minut. Produkti razgradnje GFPC materiala so nastali v plinski, vodni, trdni in dietiletrski fazi. Uporabljene analitske metode so bile FTIR (za trdno fazo), TGA (za karakterizacijo osnovnega materiala), GC-FID (za dietiletersko in plinsko fazo) ter TC (za vodno fazo). Najvišji izkoristek trdne faze je bil določen pri 250 °C in 60 min z 42,4 % ter predstavlja najnižjo razgradnjo GFPC materiala. Steklena vlakna v trdni fazi ostajajo nespremenjena pri vseh pogojih in znašajo 30 %. Maksimalen izkoristek dietiletrske faze je bil določen pri 350 °C in 5 min s 66,9 %, s podaljševanjem reakcijskega časa pa se je pričela nadaljnja razgradnja produktov v plinsko fazo. Glavne komponente dietileterske faze so bisfenol A (BPA), fenol in 4-izopropilfenol. Najvišji izkoristek BPA je bil dosežen pri 250 °C pri 60 min (48,48 %) in pri 300 °C in 5 min (52,79 %). Z višanjem temperature in daljšanjem časa se je BPA razgrajeval v enostavnejše fenole. Najvišji izkoristek plinske faze (23,4 %) smo določili pri 350 °C in 120 min. V plinski fazi smo identificirali CO2, metan, aceton, 1-penten, etan, eten, propen in 1-buten. Največji delež v plinski fazi je predstavljal aceton (97,3 %). Tekom razgradnje GFPC materiala smo v vodnih fazah določili nizke izkoristke, kjer smo pri 300 °C in 120 min določili maksimalno vrednost (2,3 %). Metoda hidrotermične depolimerizacije v podkritični vodi se izkaže kot učinkovita, okolju prijazna in selektivna alternativa konvencionalnim postopkom recikliranja takšnih kompozitov. Rezultati prispevajo k razumevanju razgradnih mehanizmov polimerov ter nudijo osnovo za nadaljnje raziskave na področju ponovne uporabe nastalih produktov.
Keywords:	polikarbonat, steklena vlakna, hidrotermična depolimerizacija, podkritična voda, bisfenol A, recikliranje
Place of publishing:	Maribor
Place of performance:	Maribor
Publisher:	[S. Pucelj]
Year of publishing:	2025
Number of pages:	1 spletni vir (1 datoteka PDF (IX, 35 f.))
PID:	20.500.12556/DKUM-93678
UDC:	66.092.:678.7(043.2)
COBISS.SI-ID:	251029763
Publication date in DKUM:	18.09.2025
Views:	219
Downloads:	37
Metadata:
Categories:	KTFMB - FKKT
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Licences

License:	CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

Link:	http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:	The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:	13.07.2025

Secondary language

Language:	English
Title:	Hydrothermal depolymerization of glass fiber-reinforced polycarbonate
Abstract:	This thesis deals with the hydrothermal depolymerization of glass fiber reinforced polycarbonate (GFPC) using subcritical water. The experiments were carried out in a highpressure and hightemperature batch reactor at temperatures of 250 °C, 300 °C, and 350 °C, with reaction times ranging from 5 to 120 minutes. The decomposition products of the GFPC material were formed in the gas, aqueous, solid, and diethyl ether phases. The analytical methods used were FTIR (for the solid phase), TGA (for the characterization of the starting material), GC-FID (for the diethyl ether and gas phase), and TC (for the aqueous phase). The highest yield of the solid phase was determined at 250 °C and 60 minutes, with 42.4 %, which represents the lowest degradation of the GFPC material. The glass fibers in the solid phase remained unchanged under all conditions and amounted to 30 %. The maximum yield of the diethyl ether phase was determined to be 66.9 % at 350 °C and 5 minutes, further degradation of the products into the gas phase began at longer reaction times. The main components of the diethyl ether phase were bisphenol A (BPA), phenol, and 4-isopropylphenol. The highest BPA yield was obtained at 250 °C for 60 minutes (48.48 %) and at 300 °C for 5 minutes (52.79 %). With increasing temperature and time, the BPA was degraded to simpler phenols. The highest gas phase yield (23.4%) was determined at 350 °C and 120 minutes. CO2, methane, acetone, 1-pentene, ethane, ethene, propene, and 1-butene were detected in the gas phase. Acetone represented the largest share in the gas phase (97.3 %). During the decomposition of the GFPC material, low yields of aqueous phase were observed, with a maximum value of 2.3 % at 300 °C and 120 minutes. The method of hydrothermal depolymerization in subcritical water proves to be an efficient, environmentally friendly and selective alternative to conventional recycling processes for such composites. The results contribute to the understanding of the mechanisms of polymer degradation and provide a basis for further research into the reuse of the resulting products.
Keywords:	polycarbonate, glass fibers, hydrothermal depolymerization, subcritical water, bisphenol A, recycling

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