20.500.12556/DKUM-87947 Porozni polimetakrilati z variabilno hidrofilnostjo diplomsko delo univerzitetnega študijskega programa I. stopnje Porous polymethacrylates with variable hydrophilicity V diplomski nalogi smo s suspenzijsko radikalsko polimerizacijo pripravili porozna polimerna zrna na osnovi kopolimerizacije metakrilatov različnih polarnosti. S spreminjanjem koncentracij monomerov butil metakrilata, lavril metakrilata, etilheksil metakrilata in zamreževala etilenglikol dimetakrilata, smo vplivali na hidrofilnost nastalih zrn. Za iniciacijo proste radikalske polimerizacije smo uporabili termični iniciator azobisizobutironitril. Na stabilnost suspenzije smo vplivali s stabilizatorji polivinil pirolidon K-90, polivinil pirolidon K-30 in polivinil alkohol. Dobljena zrna smo okarakterizirali z optičnim mikroskopom in jim določili velikost. Izkazalo se je, da so za nastanek zrn pomembni predvsem tip in masna koncentracija stabilizatorja glede na maso vodne faze, masna koncentracija iniciatorja glede na maso monomerov in čas polimerizacije. Za določanje hidrofilnosti smo sintetizirali monolite enakih koncentracij kot dobljena zrna in jim izmerili stični kot med površino in kapljico vode. Kemijsko sestavo materialov smo potrdili s FT-IR spektroskopijo, izkoristek polimerizacije pa smo določili z gravimetrijo. In this thesis, porous polymer beads were prepared by radical polymerisation in suspension based on copolymerisation of methacrylates of different polarity. By changing the concentrations of monomers butyl methacrylate, lauryl methacrylate, ethylhexyl methacrylate and crosslinker ethyleneglycol dimethacrylate, we influenced the hydrophilicity of synthesized beads. The thermal initiator azobisisobutyronitrile was used for the initiation of free radical polymerisation. For suspension stability, we used stabilisers polyvinyl pyrrolidone K-90, polyvinyl pyrrolidone K-30 and polyvinyl alcohol. We characterised produced beads with an optical microscope and determined their size. Results showed that type and mass concentration of the stabiliser relative to the mass of the aqueous phase, mass concentration of the initiator relative to the mass of the monomers and time of the polymerisation are crucial for bead formation. Monoliths of the same concentrations as formed beads were synthesized for determination of hydrophilicity by measuring the contact angle between the monolith surface and a water droplet. We confirmed chemical composition of the materials with FT-IR spectroscopy and determined the polymerisation yield by gravimetry. polimeri metakrilati suspenzijska polimerizacija prosta radikalska polimerizacija hidrofilnost polymers methacrylates suspension polymerisation free radical polymerisation hydrophilicity true true false [P. Bukovec] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2024-04-02 16:53:02 2024-05-06 08:43:45 2024-07-27 04:26:48 0000-00-00 00:00:00 2024 0 Maribor 0 Maribor 1 spletni vir (1 datoteka PDF (X, 36 f.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 66.095.261:678.744.33(043.2) 202942211 UN_Bukovec_Petra_2024.pdf UN_Bukovec_Petra_2024.pdf 1 F9075B7BAE36C11AEA6105D80F380731 a14fdcd0ccf98e290e1e954265c31b7575eaf7cda0d3d8f264d2579083792a71 e84c7ce0-06cd-11ef-9e62-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=178972 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0