Sinteza in lastnosti poliHIPE materialov na osnovi N-vinilpirolidona : magistrsko delo

Vengust, Melani

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Title:	Sinteza in lastnosti poliHIPE materialov na osnovi N-vinilpirolidona : magistrsko delo
Authors:	ID Vengust, Melani (Author) ID Koler, Amadeja (Mentor) More about this mentor... ID Krajnc, Peter (Comentor)
Files:	MAG_Vengust_Melani_2025.pdf (3,80 MB) MD5: 2B1E0BED6785A41F985ED47E92283462
Language:	Slovenian
Work type:	Master's thesis/paper
Typology:	2.09 - Master's Thesis
Organization:	FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:	V magistrskem delu smo uspešno sintetizirali visoko porozne polimerne materiale na osnovi N-vinilpirolidona (N-VP) s prosto radikalsko fotopolimerizacijo kontinuirne faze emulzije z visokim deležem notranje faze (HIPE) tipa olje v vodi. Z uporabo različnih zamreževal (pentaeritritol tetraakrilat (PETA), etilen glikol dimetakrilat (EGDMA) in trimetilolpropan triakrilat (TMPTA)) smo preučili njihov vpliv na morfologijo, poroznost in sposobnost absorpcije vode. Rezultati so pokazali, da lahko izbira zamreževala pomembno vpliva na nastanek različnih poroznih struktur – od tipične odprto celične poliHIPE strukture preko bikontinuirne morfologije do inverzne morfologije zlitih kroglic. Poleg tega na končno morfologijo materialov vpliva predhodna stabilnost emulzije (kemijska struktura in koncentracija surfaktanta ter kosurfaktanta) in sestava emulzije (volumen notranje faze in vrsta uporabljenih monomerov). Materiali so izkazali visoko poroznost (do 70%), kar je nekoliko nižje od teoretično pričakovane. To je verjetno posledica porušitve por med sušenjem. Uspešnost sinteze smo potrdili s FTIR spektroskopijo, kjer smo zaznali signale za značilne funkcionalne skupine. Vsi sintetizirani materiali so absorbirali vodo, pri čemer je imela največji vpliv koncentracija in tip zamreževala. Pri enaki koncentraciji zamreževala so najvišjo sposobnost absorpcije vode (okoli 400 % glede na maso vzorca) dosegli materili zamreženi z EGDMA, najmanj (okoli 100 % glede na maso vzorca) pa materiali zamreženi s PETA. Izvedene raziskave so potrdile uspešno sintezo visoko poroznih materialov na osnovi N-vinilpirolidona s prilagodljivimi morfološkimi in funkcionalnimi lastnostmi, ki predstavljajo dobro osnovo za nadaljnje raziskave in morebitno uporabo na biomedicinskih področjih.
Keywords:	visoko porozni polimeri, N-vinilpirolidon, hidrogeli, morfologija, zamreževalo.
Place of publishing:	Maribor
Place of performance:	Maribor
Publisher:	[M. Vengust]
Year of publishing:	2025
Number of pages:	1 spletni vir (1 datoteka PDF (X, 52 f.))
PID:	20.500.12556/DKUM-93284
UDC:	66.095.26(043.2)
COBISS.SI-ID:	243536899
Publication date in DKUM:	01.07.2025
Views:	160
Downloads:	100
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:	17.06.2025

Secondary language

Language:	English
Title:	Synthesis and properties of polyHIPE materials based on N-vinylpyrrolidone
Abstract:	In this master thesis, highly porous polymeric materials based on N-vinylpyrrolidone (N-VP) were successfully synthesised by free radical photopolymerisation of the continuous phase of a high internal phase oil-in-water emulsions (HIPE). Different crosslinkers — pentaerythritol tetraacrylate (PETA), ethylene glycol dimethacrylate (EGDMA) and trimethylolpropane triacrylate (TMPTA) — were used to investigate their influence on the morphology, porosity and water absorption capacity of the materials. The choice of crosslinker was found to significantly influence the formation of different porous structures, ranging from the typical open-cell polyHIPE morphology to bicontinuous structures and inverted structures of fused spheres. Furthermore, the final morphology of the materials was found to be influenced by the initial emulsion stability (chemical structure and concentration of the surfactant and co-surfactant) as well as the emulsion composition (volume of the inner phase and type of monomers used). The synthesised materials exhibited high porosity (up to 70%), although this was slightly lower than theoretically expected, probably due to pore collapse during the drying process. The successful synthesis was confirmed by FT-IR spectroscopy, where characteristic signals from functional groups were detected. All synthesised materials absorbed water, with the concentration and type of crosslinker having the greatest influence. At the same crosslinker concentrations, the highest water absorption capacity (approx. 400 % of the sample weight) was observed for materials crosslinked with EGDMA, while the lowest capacity (approx. 100 % of the sample weight) was observed for materials crosslinked with PETA. The investigations carried out confirmed the successful synthesis of highly porous N-vinylpyrrolidone-based materials with tunable morphological and functional properties, providing a solid foundation for further research and potential biomedical applications.
Keywords:	highly porous polymers, N-vinylpyrrolidone, hydrogels, morphology, crosslinker.

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