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V diplomskem delu smo sintetizirali poliHIPE polimere na osnovi akrilne kisline. Polimere smo nato funkcionalizirali do kislinskega klorida, ki je zelo reaktiven in predstavlja reaktiven prekurzor za reakcije z nukleofili. Za sintezo smo uporabili polimerizacijo emulzije z visokim deležem notranje faze in termično polimerizacijo. Polimeri, ki so nastali, so zelo zanimivi, saj imajo porozno strukturo in jih lahko nadaljnjo uporabimo za različne funkcionalizacije. Prav tako se uporabljajo kot katalizatorji, nosilci, v biomedicini itd. V nalogi smo za sintezo uporabili različne monomere in preverili stabilnost nastalih emulzij. Kot zamreževalo smo uporabili MBAA, kot oljno fazo pa toluen. Spreminjali smo delež oljne faze in tudi s tem preverili omenjeno stabilnost. Čiščenje nastalih monolitov smo izvedli na različne načine. Ugotovili smo, da je za najstabilnejšo strukturo monolita, potrebna zadostna količina zamreževala. V našem primeru je bil delež zamreževala 25 mol%. Nastale polimere smo funkcionalizirali s tionil kloridom in s tem dosegli pretvorbo kislinskih skupin do kislinskega klorida. Delež klora, ki se je vezal pri funkcionalizaciji smo določili s potenciometrično titracijo. In our experiment we were synthesizing polyHIPE polymers using acrylic acid as a base. The polymers were further functionalized to produce acid chloride, which is very reactive and presents a precursor for reactions with nucleophiles. For the synthesis we used polymerization of the emulsion with high percentage of the internal phase and thermal polymerization. The resulting polymers are particularly interesting because of their porous structure and their further usability for different functionalizations. They are used additionally as catalysts, carriers, in biomedicine etc. In our experiment we used different monomers for the synthesis and checked the stability of the resulting emulsion. MBAA was used as a cross-linking agent and toluene for the oil phase. We were changing the percentage of the oil phase to check the aforementioned stability. Different techniques were used for cleaning the resulting monoliths. We came to the conclusion, that to produce the most stable structure of the monolith, a sufficient amount of cross-linking is needed. In our case, this was 25 mol%. The formed polymers were functionalized with thionyl chloride, with which we achieved the transformation of acidic groups into acid chloride. The percentage of the binding chloride after functionalization was determined with potentiometric titration. |
