20.500.12556/DKUM-37034 BIKONTINUIRNI POROZNI POLIMERI NA OSNOVI ZAMREŽENIH POLI(STIRENOV) IN POLI(N-IZOPROPILAKRILAMIDA) BICONTINUOUS POROUS CROSS-LINKED POLYMERS BASED ON POLY(STYRENE) AND POLY(N-ISOPROPYLACRYLAMIDE) Porozne polimerne materiale, ki jih pripravljamo iz emulzij, ki vsebujejo visok delež notranje faze, imenujemo poliHIPE materiali. Zaradi odprte celične strukture so visoko porozni (tudi do 99 %). Uporabni so na različnih področjih, kjer rabimo veliko površino, glede na malo maso materiala, kot npr. pri filtrih za razna filtriranja, za molekularne separacije in sinteze ali kot nosilce v katalizi in v biotkivnem inženiringu. Predmet mojega diplomskega dela je bila priprava bikontinuirnih poroznih polimerov na osnovi poli(stirenov) in poli(N-izopropilakrilamida). Monomeri so bili prisotni v organski kot v vodni fazi emulzij. PoliHIPE materiali so v organski fazi vsebovali monomer stiren in zamreževalec divinilbenzen, ki sta tvorila hidrofoben skelet. Odprto strukturo celic materiala smo napolnili s hidrofilnim gelom iz poli-NIPAAm-a, ki smo ga zamrežili z MBA. Tako pripravljene bikontinuirne porozne polimere smo testirali s pretokom raztopine skozi monolitni material. Ker je poli-NIPAAm temperaturno odziven material, se je le-ta ob spremembi temperature pretočnega medija odzval. Odziv je bil nabrekanje ali skrčenje materiala v notranjosti por, kar je vplivalo na pretok raztopine in pritisk v koloni. Z vrstično elektronsko mikroskopijo smo določili morfologijo monolitnih materialov in s tem potrdili njihovo poroznost. Z infrardečo spektroskopijo smo preverili kemijsko strukturo monolitov. Monolitom smo izmerili povratni tlak s pomočjo HPLC črpalke. Porous polymer materials, which are made from emulsions that have high ratio of internal phase, are called polyHIPE materials. PolyHIPE materials are highly porous (up to 99 %), because of their open cell structure. These materials can be applied to different areas, where large surface is needed, according to low mass of material, in filters or different filtrations, molecular separations, synthesis or as bearers in catalysis. Materials are very useful in tissue engineering too. The subject of my work was the preparation of bicontinuous porous polymers, on the basis on poly-styrene and poly-N-isopropylacrylamide. Monomers were present in both, continuous and the droplet phase. In organic phase styrene was the monomer, which was cross-linked with divinylbenzene. Together they formed a hydrofobic skeleton. Open structure was filled with hydrophilic poly-NIPAAm gel, which had been cross-linked with MBA. Bicontinuous porous polymers were tested with the solution flow through the monolitic material. Due to the fact that poly-NIPAAm is temperature responsive material, it responded to the temperature change of solution. The response was swelling and de-swelling of material which effected the solution flow and pressure in the column. With scanning electron microscope we determined the morphology of monolitic materials and confirmed their porosity. Further, the structure of monoliths was checked with an infrared spectroscopy and their back pressure measured with HPLC pump. monolit emulzija z visokim deležem notranje faze stiren DVB polimerizacija porozen material poliHIPE N-izopropilakrilamid poli-NIPAAm monolith high internal phase emulsion styrene DVB polymerisation porous material polyHIPE N-isopropylacrylamide poly-NIPAAm true true false [S. Bukovšek] Slovenski jezik Angleški jezik Diplomsko delo 2012-07-30 17:29:32 2012-09-11 09:56:01 2022-04-22 11:07:01 2021-04-15 03:38:17 2012 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 547.1.057:678.6(043.2) 16682006 URN:SI:UM:DK:HG6DX9O3 UNI_Bukovsek_Sandi_2012.pdf UNI_Bukovsek_Sandi_2012.pdf 1 98B1F6777519616E6B2997E12362734F 3d09f64bdd863911dc7c8dda357b595e794541fd472076aef950d1b21ff63d1e f7c58a1f-7c07-11eb-bb7a-00155d0001ca 20.500.12556/dkum/71979257-0829-48b2-86e4-c6705437d978 https://dk.um.si/Dokument.php?lang=slv&id=48590 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0