Vezava paladija na porozen zamrežen poli(4-vinilpiridin)

diplomsko delo univerzitetnega študijskega programa I. stopnje

Tadeja Katan (Avtor), Peter Krajnc (Mentor), Jernej Iskra (Komentor)

Povzetek

Diplomska naloga temelji na sintetiziranju funkcionalnih poroznih polimerov. Za njihovo pripravo smo izbrali postopek polimerizacije emulzij z visokim deležem notranje faze (poliHIPE). Te emulzije so v kontinuirni fazi vsebovale različne deleže monomerov 4-vinilpiridin, divinilbenzen in stiren. Po uspešni polimerizaciji emulzije so nastali stabilni monoliti, katere smo nato s postopkom hiperzamreženja dodatno zamrežili. Hiperzamreženje smo izvedli na dva različna načina. Prvi način je potekal z di-tert-butil peroksidom, drugi pa s pomočjo Friedel-Kraftsove reakcije. Z adsorpcijsko porozimetrijo smo analizirali vzorce po polimerizaciji in po hiperzamreženju. Z analizami smo pri obeh načinih potrdili nastanek novih povezovalnih por in s tem povečana specifična površina. Na dodatno zamrežen polimer z večjo specifično površino smo želeli vezati paladijevo sol. Ker imajo delci paladija veliko razmerje med površino in volumnom, je ponavadi velik delež delcev izpostavljen reaktivnim molekulam, kar ga odlikuje v dober katalizator. S polimeri stabilizirani delci paladija imajo pomembno vlogo v okoljskih in industrijskih procesih, probleme pa predstavljajo postopki za imobilizacijo in s tem znižana katalitska aktivnost polimera. Mi smo paladij želeli imobilizirati s poli(4vinilpiridin-ko-divinilbenzen-ko-stiren) monoliti tako, da bi ga vezali na proste dušikove atome v piridinskem obroču. Zato je bil naš primarni cilj ustvariti stabilno emulzijo, ki bi vsebovala čim večji delež 4-vinil piridina in s tem čim več prostih dušikovih atomov.

Ključne besede

funkcionalni porozni polimeri;poliHIPE;paladij;hiperzamreženje;4-vinilpiridin;diplomske naloge;

Podatki

Jezik:	Slovenski jezik
Leto izida:	2017
Tipologija:	2.11 - Diplomsko delo
Organizacija:	UM FKKT - Fakulteta za kemijo in kemijsko tehnologijo
Založnik:	[T. Katan]
UDK:	665.562.2(043.2)
COBISS:	21045014
Št. ogledov:	765
Št. prenosov:	78
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	Immobilization of palladium to porous crosslinked poly(4-vinylpyridine)
Sekundarni povzetek:	My Bachelor´s degree thesis is the preparation of a functional porous polymer. For it´s preparation we chose the high internal phase emulsion polymerization. In continous phase of this emulsion, we varied molar procentage of 4-vinylpyridine, divinylbenzene and styrene. After a succesful polymerization of emulsion, stable monolites were formed, which were then additionaly crosslinked. Crosslinking was accomplished with two different methodes. The first one was classical crosslinking method carried out with di-tert-butil peroxide. The second method of crosslinking was acomplished with reaction of Friedel-Crafts. We analized samples from before and after crosslinking with adsorption porosimetry and the results of both were very similar. Both showed increased specific surface areas in crosslinked polymers. The aim of the next step was immobilization of palladium on crosslinked polymer with increased surface area. The ratio of surface area and volume of palladium particles is very high, thus the big exposure to other reactive molecules. This feature is what makes paladium a great catalyst. Polymer immobilized particles have a great role in enviromental and industrial proceses. The only problem represents process of immobilzation and thus the decrease in catalytical activity. We wanted to stabilize palladium with poly(4-vinylpyridine-co-divynilbenzene-co-styrene) polymers, so that we bind it on free nitrogen atoms in pyridine ring. In conclusion, our primary goal was to create a stable emulsion with procentage of 4-vinylpyridine as high as possible, so that it consequently contains more nitrogen atoms.
Sekundarne ključne besede:	functional porous polymers;polymerization;polyHIPE;crosslinked;4-vinylpyridine;
URN:	URN:SI:UM:
Vrsta dela (COBISS):	Diplomsko delo/naloga
Komentar na gradivo:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Strani:	IX, 35 str.
ID:	10858860