20.500.12556/DKUM-94924 Funkcionalizacija visoko poroznih stirenskih polimerov v pretočnem reaktorju diplomsko delo univerzitetnega študijskega programa I. stopnje Functionalization of highly porous polymers of the styrene type in a flow reactor V diplomskem delu smo sintetizirali zamrežene visoko porozne poliHIPE materiale na osnovi vinilbenzil klorida (VBC) in divinilbenzena (DVB), katere smo pripravili s prosto radikalsko polimerizacijo monomerne faze emulzij z visokim deležem notranje faze (HIPE). Te polimere smo nadalje hiperzamrežili s post polimerizacijsko reakcijo Friedel-Craftsovega alkiliranja v šaržnem in kontinuirnem (pretočnem) postopku, ter primerjali njihovo učinkovitost. Polimere smo sintetizirali z različnimi stopnjami zamreženja (5, 10, 30 in 70 mol% DVB), kjer smo za iniciator uporabili AIBN in surfaktant Span 80 kot stabilizator HIP emulzij. Osnovni poliHIPE materiali so izkazovali značilno odprto celično strukturo z nizkimi specifičnimi površinami (2-6 m2/g). Hiperzamreženje v šaržnem reaktorju pa je povzročilo znatno povečanje specifične površine (do 418 m2/g) in nastanek mezo in mikro por, ki smo jih dokazali s pomočjo dušikovih adsorpcijsko–desorpcijskih izoterm (BJH in t-plot metoda). Kontinuirno hiperzamreženje v pretočnem reaktorju je omogočilo še bolj izrazito povečanje specifične površine (do 552 m2/g) ter povečanje volumna nastalih mikro por v primerjavi s šaržnim postopkom. Slike posnete z vrstičnim elektronskim mikroskopom so pokazale, da se pri kontinuirnem postopku ohrani poliHIPE morfologija, hkrati pa se zmanjša mehanska degradacija polimernega materiala. S potenciometrično titracijo smo določili, da se masni delež kloridnih ionov po hipezamreženju drastično zmanjša, kar sovpada s povišanje BET specifične površine in narašnjem volumna mezo in mikro por po hiperzamreženju, s čimer smo dodatno potrdili uspešnost hiperzamreženja, ki je glede na vse rezultate karakterizacijskih metod bolj uspešno pri reakciji v pretoku. Rezultati potrjujejo, da kontinuirni postopek hiperzamreženja omogoča krajši čas reakcije in izboljšane strukturne lastnosti materiala v primerjavi s šaržnim postopkom. In our thesis, we synthesized cross-linked highly porous polyHIPE materials based on vinylbenzyl chloride (VBC) and divinylbenzene (DVB), which we prepared by free radical polymerization of monomer phase emulsions with a high internal phase content (HIPE). These polymers were further hypercrosslinked by a post-polymerization Friedel-Crafts alkylation reaction in a batch and continuous (flow) process, and their effectiveness was compared. The polymers were synthesized with different degrees of crosslinking (5, 10, 30, and 70 mol% DVB), using AIBN as the initiator and Span 80 surfactant as the HIP emulsion stabilizer. The basic polyHIPE materials exhibited a characteristic open cell structure with low specific surface areas (2-6 m2/g). Hypercrosslinking in a batch reactor resulted in a significant increase in specific surface area (up to 418 m2/g) and the formation of mesopores and micropores, which we demonstrated using nitrogen adsorption-desorption isotherms (BJH and t-plot methods). Continuous hypercrosslinking in a flow reactor enabled an even more pronounced increase in specific surface area (up to 552 m2/g) and an increase in the volume of micro pores formed compared to the batch process. Images taken with a scanning electron microscope showed that the polyHIPE morphology is preserved in the continuous process, while the mechanical degradation of the polymer material is reduced. Potentiometric titration determined that the mass fraction of chloride ions is drastically reduced after hypercrosslinking, which coincides with an increase in BET specific surface area and an increase in the volume of mesopores and micropores after hypercrosslinking, thus further confirming the effectiveness of hypercrosslinking, which, according to all the results of the characterization methods, is more effective in the flow reaction. The results confirm that the continuous hypercrosslinking process enables shorter reaction times and improved structural properties of the material compared to the batch process. poliHIPE hiperzamreženje pretočni reaktor kontinuirno hiperzamreženje polyHIPE hypercrosslinking flow reactor continuous hypercrosslinking true true false [D. Gavrić] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2025-08-29 09:57:42 2025-09-23 13:08:34 2025-10-30 03:15:17 0000-00-00 00:00:00 2025 0 Maribor 0 Maribor 1 spletni vir (1 datoteka PDF (IX, 34 str.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 66.095.26:678.746(043.2) 255288067 UN_Gavric_Dejan_2025.pdf UN_Gavric_Dejan_2025.pdf 1 45C5022886E7004A5E85E2EB5C4B9A33 c626e4f92005b034e113466eff6e8046b345c6b64a24d49854df63b9b454d2fa c0585357-96d1-11f0-b110-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=198898 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0