Priprava fluoro-poliHIPE materialov iz multifunkcionalnih akrilatov

Slavič, Nastja

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Title:	Priprava fluoro-poliHIPE materialov iz multifunkcionalnih akrilatov
Authors:	ID Slavič, Nastja (Author) ID Krajnc, Peter (Mentor) More about this mentor...
Files:	MAG_Slavic_Nastja_2024.pdf (4,94 MB) MD5: 246E029D768B7172FC91C6E9EAA7F404
Language:	Slovenian
Work type:	Master's thesis/paper
Typology:	2.09 - Master's Thesis
Organization:	FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:	Uspeh razvoja polimerov in veliko povpraševanje po polimernih izdelkih s strani hitro rastočega svetovnega prebivalstva se odraža v naraščajoči proizvodnji polimerov. Precejšni del proizvodnje predstavljajo porozni polimeri. Le-ti se zaradi svoje visoke specifične površine, nizke gostote, pretočnosti in zmožnosti kontroliranja morfologije uporabljajo v različnih aplikacijah, kot so odstranjevanje onesnaževalcev iz okolja, adsorpcija plinov, kataliza, tkivno inženirstvo, kromatografija, separacijske membrane, matrike za nadzorovano sproščanje zdravilnih učinkovin in pametni materiali. V okviru magistrske naloge smo sintetizirali fluoro-poliHIPE materiale z različnimi stopnjami zamreženja (10 %, 20 % in 40 %) in jih primerjali z njihovimi nefluoriranimi analogi. Porozne polimere smo pripravili s polimerizacijo emulzij z visokim deležem notranje faze (HIPE). Kot monomer smo uporabili 2,2,2-trifluoroetil metakrilat oziroma etil metakrilat (TFEMA oz. EMA), ki smo ga zamrežili z uporabo različnih zamreževal (trimetilolpropan triakrilata (TMPTA), etilenglikol dimetakrilata (EGDMA), dipentaeritritol heksaakrilata (DPEHA) in pentaeritritol tetraakrilata (PETA)). Za uspešnost sinteze poliHIPE vzorcev je bila najpomembnejša stabilizacija emulzije. To smo uspešno dosegli z ustrezno izbiro vrste in koncentracije surfaktanta (Hypermer B246) in raztopine soli (1,78 % raztopina CaCl2 ∙ 6H2O), ki je predstavljala vodno fazo. Kot topilo smo izbrali toluen, za iniciacijo proste radikalske polimerizacije pa smo uporabili termični iniciator α,α'-azoisobutironitril (AIBN). Polimere smo očistili s kontinuiranim spiranjem v Soxhletovem aparatu z izopropanolom in jih okarakterizirali z različnimi metodami. S Fourierovo transformacijsko infrardečo spektroskopijo (FTIR) smo preučili kemijsko sestavo sintetiziranih polimerov. Morfologijo pripravljenih poliHIPE materialov smo preučili z vrstičnim elektronskim mikroskopom (SEM), specifično površino polimerov pa smo določili z uporabo Brunauer-Emmett-Tellerjeve (BET) metode. Navsezadnje smo s termogravimetrično analizo (TGA) preverili termično stabilnost pripravljenih poroznih polimerov.
Keywords:	HIP emulzije, poliHIPE, porozni polimeri, polimerizacija, fluoropolimeri
Place of publishing:	Maribor
Year of publishing:	2024
PID:	20.500.12556/DKUM-89342
Publication date in DKUM:	21.08.2024
Views:	327
Downloads:	105
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:	04.07.2024

Secondary language

Language:	English
Title:	Preparation of fluoro-polyHIPE materials from multifunctional acrylates
Abstract:	The perpetual development of polymers and the high demand for their products due to the rapidly growing world population is reflected in the increasing production thereof. A large part of the production are porous polymers. Due to their high specific surface area, low density, permeability and control over the morphology, they are used in various applications, such as the removal of pollutants from the environment, gas adsorption, catalysis, tissue engineering, chromatography, separation membranes, drug delivery and smart materials. In this work, fluoropolyHIPE materials with different degrees of crosslinking were synthesised (10%, 20% and 40%) and compared with their non-fluorinated analogues. The porous polymers were prepared by polymerising a high internal phase emulsions (HIPE). As the monomer 2,2,2-trifluoroethyl methacrylate or ethyl methacrylate (TFEMA or EMA) were used, which were crosslinked with different crosslinking agents (trimethylolpropane triacrylate (TMPTA), ethylene glycol dimethacrylate (EGDMA), dipentaerythritol hexaacrylate (DPEHA) and pentaerythritol tetraacrylate (PETA)). The stabilisation of the emulsion was the most crucial part for the successful preparation of the polyHIPEs. This was successfully achieved by selecting the appropriate type and concentration of the surfactant (Hypermer B246) and the salt solution (1,78% CaCl2 ∙ 6H2O solution as the aqueous phase). Toluene was used as the solvent and the thermal initiator α,α'-azoisobutyronitrile (AIBN) was used to initiate the free radical polymerisation. The polymers were purified by the continuous rinsing in a Soxhlet apparatus with isopropanol and characterised by using different methods. Fourier transform infrared spectroscopy (FTIR) was used to investigate the chemical composition of the synthesised polymers. The morphology of the synthesised polyHIPEs was investigated with a scanning electron microscope (SEM), and the specific surface area of the polymers was determined using the Brunauer-Emmett-Teller (BET) method. Lastly, thermogravimetric analysis (TGA) was used to characterise the thermal stability of the prepared porous polymers.
Keywords:	High Internal Phase Emulsions, polyHIPE, porous polymers, polymerisation, fluoropolymers

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