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Priprava poliHIPE membran in karakterizacija termičnih lastnosti : diplomsko deloSevšek, UrškaZ uporabo emulzijske polimerizacije smo sintetizirali porozne polihipe membrane s 5 % zamreženjem. Uporabili smo monomere stiren, divinilbenzen in 2-etilheksil akrilat. Divinilbenzen je služil kot ... zamreževalec, 2-etilheksil akrilat je bil dodan kot snov za povečanje plastičnosti, kot iniciator smo uporabili kalijev peroksodisulfat, kot surfaktant pa Span 80. Zaradi spreminjanja viskoznosti emulzije smo dodali organsko topilo. Kot najustreznejšega smo izbrali klorobenzen. Spreminjali smo tako delež topila kot delež 2-etilheksil akrilata. Ob uporabi propelerskega mešala in reaktorske posode smo pri 300 obr/min dobili emulzijo z visokim deležem notranje faze, ki smo jo nanesli na stekleno ploščo in s povišano temperaturo sprožili polimerizacijo. Nastale so porozne poliHIPE membrane z debelinami od 60-100 %m. Pri membranah smo želeli doseči ustrezno gibljivost zaradi morebitnih zahtev aplikacij. Z dodatkom 2-etilheksil akrilata se je gibljivost membran bistveno izboljšala. V nadaljevanju smo spreminjali delež etilheksil akrilata, saj smo želeli preveriti njegov vpliv na termične lastnosti membran. Z infrardečo spektroskopijo smo preverili kemijsko strukturo membran. S termično analizo smo določili termične lastnosti membran v temperaturnem območju od 40 °C do 500 °C. Uporabili smo termični metodi termogravimetrijo in diferenčno dinamično kalorimetrijo. Ugotovili smo, da je pri vseh vzorcih opazna popolna izguba mase. Iz termogravimetrične krivulje je razvidna ena stopnja razpada, katerega temperaturno območje se giblje med 350°C in 470 °C. Z razpadom sovpada tudi temperatura tališča, ki je med 415 °C in 427 °C. Temperatura steklastega prehoda se nakazuje pri temperaturi okoli 45 °C. Vpliva 2-etilheksil akrilata na temperaturo steklastega prehoda nismo zaznali.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Maribor : [U. Sevšek], 2008Language - slovenianCOBISS.SI-ID - 16175880
Author
Sevšek, Urška
Other authors
Krajnc, Peter, 1970- |
Kristl, Matjaž
Topics
Univerzitetna in visokošolska dela |
kemija |
polimeri |
membrane |
polimerizacija |
emulzije |
zamreženi polimeri |
termične lastnosti |
polistiren |
diplomska dela
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Library/institution |
City | Acronym | For loan | Other holdings |
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Miklošič Library FPNM, Maribor | Maribor | PEFMB |
reading room 1 cop.
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Year | Impact factor | Edition | Category | Classification | ||||
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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DRS, in which the journal is indexed
Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Sevšek, Urška | 30946 |
Krajnc, Peter, 1970- | 15501 |
Kristl, Matjaž | 14755 |
Source: Personal bibliographies
and: SICRIS
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