Optimizacija površinskih lastnosti makroporoznih poliakrilatov

diplomsko delo univerzitetnega študijskega programa I. stopnje

Ana Bratuša (Avtor), Peter Krajnc (Mentor), Mitja Kolar (Komentor)

Povzetek

V diplomski nalogi predstavljamo pripravo poroznih polimernih materialov s tehniko sintranja poli(metil metakrilatnih) (PMMA) zrn. Nov polimerni material smo sintetizirali s polimerizacijo v vmesnih prostorih med zrni. Sintrana zrna so nam tako služila kot nosilec, prek katerega smo nanesli monomerno mešanico in jo polimelizirali. Prelit nosilec je bilo nato treba očistiti v ustreznem topilu, ki je omogočalo odstranitev sintranih zrn iz na novo sintetiziranega materiala in s tem nastanek porozne strukture. Pri izboru topila smo bili zato omejeni na dva pogoja, tj. izbrano topilo je moralo dobro raztapljati poli(metil metakrilatna) (PMMA) zrna, medtem ko nanešenega polimeliziranega materiala ni smelo topiti. Za pripravo primerno sintranih nosilcev je bilo najprej treba določiti optimalne pogoje (temperaturo in čas sintranja), pri katerih se zrna najmočneje in najbolje spojijo. Kot najbolj optimalno se je izkazalo sintranje pri 180 °C 24 h. Za dosego optimalnih rezultatov je bilo v postopek priprave sintranih nosilcev treba vključiti še predhodno stresanje zrn, ki je omogočilo zmanjšanje praznin med nasutimi zrni in s tem boljše stikanje samih zrn, kar je pripomoglo k večji končni poroznosti na novo pripravljenega polimernega materiala. Z zgoraj opisano tehniko smo tako pripravili dva porozna polimerna materiala. To sta alifatski uretanski diakrilat (AUD) in bisfenol A glicerolat (1-glicerol/fenol) dimetakrilat (Bis GMA). Oba sta nastala s porozno strukturo, sestavljeno iz primarnih por, ki jih medsebojno povezujejo manjše, povezovalne pore. Primarne pore zasedajo mesta, kjer se je pred čiščenjem novega polimera nahajal sintran nosilec, povezovalne pore pa so se izoblikovale na stičnih mestih sintranih zrn.

Ključne besede

poli(metil metakrilat);porozni polimeri;polimerni nosilci;sintranje;polimerizacija;

Podatki

Jezik:	Slovenski jezik
Leto izida:	2014
Tipologija:	2.11 - Diplomsko delo
Organizacija:	UM FKKT - Fakulteta za kemijo in kemijsko tehnologijo
Založnik:	[A. Bratuša]
UDK:	544.556(043.2)
COBISS:	18219542
Št. ogledov:	1714
Št. prenosov:	212
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	OPTIMISATION OF SURFACE PROPERTIES OF MACROPOROUS POLYACRYLATES
Sekundarni povzetek:	In the graduation thesis, we present the preparation of porous polymeric materials with the technique of sintering poly(methyl methacrylate) (PMMA) beads. We synthesized the new polymeric material with polymerization in spaces between the beads. Sintered beads were used as a carrier that helped us achieve porosity in the final polymeric material. Furthermore, the preformed carrier had to be subsequently dissolved in a suitable solvent to enable the abstraction of sintering beads from the newly synthesized material and by that the emergence of the porous structure. That is why we were limited to two conditions when choosing the solvent - it had to dissolve poly(methyl methacrylate) beads, but not the polymerized material. For the preparation of sintered carriers, it was first necessary to determine the optimal conditions, such as temperature and time of the sintering, at which the merging of the beads would be appropriate for achieving the final interconnected porous structure. Sintering at 180°C for 24 hours proved to be the most optimal. To get the optimal results, preliminary shaking of the beads had to be included into the procedure. This enabled a decrease of the empty spaces between the beads, and with that a better contact between the beads which resulted in the larger final porosity of the newly prepared polymeric material. We prepared two porous polymeric materials with the technique summarized above namely are aliphatic urethane diacrylate (AUD) and bisphenol-A-glycidyl (1-glycerol/phenol) dimethacrylate (Bis-GMA). Both showed a porous structure, composed of primary pores which are interconnected by smaller, connective pores. The primary pore took up the place where the beads were located prior to the PMMA dissolving, while the smaller ones were created at the contact points of the sintering beads.
Sekundarne ključne besede:	poly(methyl methacrylate);porous polymers;polymer carrier;sintering;polymerization;
URN:	URN:SI:UM:
Vrsta dela (COBISS):	Diplomsko delo/naloga
Komentar na gradivo:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Strani:	X, 48 str.
ID:	8730433