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Title:HYBRID PolyHIPE MATERIALS
Authors:Kovačič, Sebastijan (Author)
Krajnc, Peter (Mentor) More about this mentor... New window
Slugovc, Christian (Co-mentor)
Files:.pdf DR_Kovacic_Sebastijan_2011.pdf (3,71 MB)
 
Language:English
Work type:Dissertation (m)
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:A new class of polyHIPE materials has been prepared using high internal phase emulsions (HIPEs) with monomers in both phases. Resulting materials, namely hybrid polyHIPE materials, are obtained consisting of hydrophobic matrix (consisted of styrene cross-linked with DVB or dicyclopentadiene) filled with hydrophilic polymer gel (polyacrylic acid or polyNIPAM) and exhibit morphology changes according to pH and temperature of the surrounding medium. Our focus with regards to the production of hybrid polyHIPE materials was the responsiveness of such materials used for flow control. This property is beneficial for controlling the flow of the solution through the monolithic polymers. Furthermore, polyHIPE materials have also been prepared by using ring opening metathesis polymerisation of monomers, such as dicyclopentadiene and norbornene. Obtained materials have Young’s moduli in the range of hundred times higher than standard polyHIPE materials with the same level of porosity which represents a very important improvement in the development of highly porous cellular polymeric materials.
Keywords:emulsions, high internal phase emulsions, polymers, polyHIPEs, hybrid, hybrid polyHIPE materials, ROMP, flow-through, styrene, DVB, acrylic acid, NIPAM
Year of publishing:2011
Publisher:[S. Kovačič]
Source:Maribor
UDC:547(043.3)
COBISS_ID:14931734 Link is opened in a new window
NUK URN:URN:SI:UM:DK:HMF1ZEJF
Views:2314
Downloads:208
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:KTFMB - FKKT
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Secondary language

Language:Slovenian
Title:HIBRIDNI PoliHIPE MATERIALI
Abstract:Predmet mojega doktorskega dela je priprava novih poliHIPE materialov iz emulzij z visokimi deležem notranje faze, pričemer bodo monomerji prisotni v obeh fazah emulzije. Pridobljeni poliHIPE materiali, hibridni poliHIPE materiali, bodo sestavljeni iz hidrofobnega skeleta (poli stirena zamreženega z DVB oz. diciklopentadien) pri čemer bo celična struktura materiala napolnjena s hidrofilnim polimernim gelom (poli akrilna kislina ali poli NIPAM zamrežena z MBA). Tako pripravljene hibridne poliHIPE materiale z dvofazno morfologijo bomo testirali v pretočnih sistemih kot polimerne ventile. Dvofazno morfologijo hibridnih poliHIPE materialov bomo izkoristili za kontroliranje pretoka raztopine skozi monolitni polimeri. Notranja polimerna domena (t.i. polimerni gel) bo ob spremembi pH ali temperature črpane raztopine nabreknila ali se skrčila in s tem omogočila ali onemogočila pretok skozi material. Za pripravo poliHIPE materialov smo uporabili dve polimerizacijski tehniki, termično inicirano radikalsko polimerizacijo in polimerizacija pri kateri polimeriziramo ciklične monomerje (diciklopentadien ali norbornen) z odpiranjem obroča (ROMP). PoliHIPE materiali polimerizirani s ROMP mehanizmom so se izkazali z izjemnimi mehanskimi lastnostmi, saj so meritve mehanske jakosti pokazale sto krat višje vrednosti v primerjavi s poliHIPE materiali polimeriziranimi z navadno radikalsko polimerizacijo.
Keywords:emulzije, emulzije z visokim deležem notranje faze, polimeri, poliHIPE, hibrid, hibridni poliHIPE, ROMP, pretočna tehnika, stiren, DVB, akrilna kislina, NIPAM


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