diplomsko delo univerzitetnega študijskega programa I. stopnje
Bernard Iternička (Avtor), Peter Krajnc (Mentor), Muzafera Paljevac (Komentor)

Povzetek

V diplomskem delu smo pripravili porozne materiale na osnovi poli(glicidil metakrilata), ki so imeli več nivojsko poroznost. Takšno poroznost smo dosegli s tehniko sintranja poli(metil metakrilatnih) (PMMA) zrn. PMMA zrna smo sintrali in dobili nosilce, preko katerih smo nato prelili emulzijo z visokim deležem notranje faze (HIPE), ter nato polimerizirali kontinuirno fazo emulzije. Po polimerizaciji je nato sledilo čiščenje z vročim etilacetatom v Soxhletovem aparatu. S tem smo odstranili PMMA zrna in dobili želeno poroznost materiala. Najprej smo se lotili priprave nosilcev. Poli(metil metakrilatna) zrna smo sintrali pri dveh temperaturah, 180 °C in 200 °C, različno dolgo: 1h, 2h, 5h, 24h in 48h. Tako smo dobili nosilce, ki se medseboj razlikujejo v številu povezav in vratov med zrni. Nato smo pripravili HIP emulzijo tipa voda v olje, ki se je sestavljala iz glicidil metakrilata (GMA) zamreženega z 10% etilenglikol dimetakrilata (EGDMA). Pripravljeno emulzijo smo razdelili na dva dela. Del smo termično polimerizirali v kalupu, del smo pa prelili preko prej različno sintranih PMMA nosilcev, ter nato termično polimerizirali v pečici. Po polimerizaciji je sledilo čiščenje z etilacetatom v Soxhletovem aparatu, kar je odstranilo PMMA zrna iz matrice materialov. Končne vzorce smo nato analizirali z vrstičnim mikroskopom. Vsi pripravljeni materiali so kazali odprto celično zgradbo in želeno hierarhijo por. Primarne pore so nastale na mestih, kjer so pred čiščenjem bila PMMA zrna. Na mestih, kjer so se zrna pred čiščenjem stikala in povezovala pa so nastale povezovalne oz. sekundarne pore. V skeletu materialov so prisotne tudi terciarne pore, ki so posledica poroznosti samega poliHIPE materiala.

Ključne besede

sintranje;poli(metil metakrilat);glicidil metakrilat;porozni polimeri;emulzije z visokim deležem notranje faze;diplomske naloge;

Podatki

Jezik: Slovenski jezik
Leto izida:
Tipologija: 2.11 - Diplomsko delo
Organizacija: UM FKKT - Fakulteta za kemijo in kemijsko tehnologijo
Založnik: [B. Iternička]
UDK: 665.2(043.2)
COBISS: 21962518 Povezava se bo odprla v novem oknu
Št. ogledov: 795
Št. prenosov: 114
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Angleški jezik
Sekundarni naslov: Synthesis of poly(glycidyl methacrylate) with multilevel porosity
Sekundarni povzetek: In this dissertation, we prepared porous materials on the basis of poly(glycidyl methacrylate), with multilevel porosity. This porosity was achived by method of sintering poly(methyl methacrylate) (PMMA) beads. These sintered beads served as supports, over which we poured high internal phase emulsion (HIPE) and polymerized continuous phase of the emulsion. After the polymerization, PMMA beads were removed in the Soxhlet apparatus in order to get porous material. Firstly, we sintered our supports. PMMA beads were sintered at two different temperatures, 180 °C and 200 °C, for different amounts of time: 1h, 2h, 5h, 24h and 48h. That way, we prepared supports that differentiated in amounts of interconnections and necks between beads. Then we prepared high internal phase emulsion, type water-in-oil, with GMA and 10% EGDMA. The emulsion was separated on two parts: half of the emulsion was polymerized thermally in the oven and the other half was poured over differently sintered PMMA supports, and then polymerized thermally in the oven. After the polymerization, PMMA beads were removed from the obtained products by extraction using hot ethyl acetate in a Soxhlet apparatus, thus resulting in porous material. Final products were then characterized with a scanning electron microscope (SEM). All of the prepared materials showed open cell structure and multilevel porosity. Primary pores were interconnected with smaller, connective or secondary pores. Primary pores took the place of PMMA beads, which were removed by the process of cleaning, while connective pores were formed at the contact points of the sintered beads. The framework of the materials showed porous structure, the so-called tertiary pores, which corresponded to the porosity of poly(GMA-co-EGDMA) material.
Sekundarne ključne besede: sintering;poly(methyl methacrylate);glycidyl methacrylate;porous polymers;high internal phase emulsion;
URN: URN:SI:UM:
Vrsta dela (COBISS): Diplomsko delo/naloga
Komentar na gradivo: Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Strani: VIII, 33 str.
ID: 10956408