| | SLO | ENG | Cookies and privacy

Bigger font | Smaller font

Show document

Title:BIKONTINUIRNI POROZNI POLIMERI NA OSNOVI ZAMREŽENIH POLI(STIRENOV) IN POLI(N-IZOPROPILAKRILAMIDA)
Authors:Bukovšek, Sandi (Author)
Krajnc, Peter (Mentor) More about this mentor... New window
Files:.pdf UNI_Bukovsek_Sandi_2012.pdf (5,93 MB)
 
Language:Slovenian
Work type:Undergraduate thesis (m5)
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract: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.
Keywords:monolit, emulzija z visokim deležem notranje faze, stiren, DVB, polimerizacija, porozen material, poliHIPE, N-izopropilakrilamid, poli-NIPAAm
Year of publishing:2012
Publisher:[S. Bukovšek]
Source:Maribor
UDC:547.1.057:678.6(043.2)
COBISS_ID:16682006 Link is opened in a new window
NUK URN:URN:SI:UM:DK:HG6DX9O3
Views:1720
Downloads:138
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:KTFMB - FKKT
:
  
Average score:(0 votes)
Your score:Voting is allowed only for logged in users.
Share:AddThis
AddThis uses cookies that require your consent. Edit consent...

Hover the mouse pointer over a document title to show the abstract or click on the title to get all document metadata.

Secondary language

Language:English
Title:BICONTINUOUS POROUS CROSS-LINKED POLYMERS BASED ON POLY(STYRENE) AND POLY(N-ISOPROPYLACRYLAMIDE)
Abstract: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.
Keywords:monolith, high internal phase emulsion, styrene, DVB, polymerisation, porous material, polyHIPE, N-isopropylacrylamide, poly-NIPAAm


Comments

Leave comment

You have to log in to leave a comment.

Comments (0)
0 - 0 / 0
 
There are no comments!

Back
Logos of partners University of Maribor University of Ljubljana University of Primorska University of Nova Gorica