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Title:Vezava paladija na porozen zamrežen poli(4-vinilpiridin)
Authors:Katan, Tadeja (Author)
Krajnc, Peter (Mentor) More about this mentor... New window
Iskra, Jernej (Co-mentor)
Files:.pdf UN_Katan_Tadeja_2017.pdf (3,69 MB)
 
Language:Slovenian
Work type:Bachelor thesis/paper (mb11)
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract: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.
Keywords:funkcionalni porozni polimeri, poliHIPE, 4-vinilpiridin, paladij, Friedel-Kraftsov postopek hiperzamreženja
Year of publishing:2017
Publisher:[T. Katan]
Source:Maribor
UDC:665.562.2(043.2)
COBISS_ID:21045014 Link is opened in a new window
NUK URN:URN:SI:UM:DK:NTRNCMES
License:CC BY-NC-ND 4.0
This work is available under this license: Creative Commons Attribution Non-Commercial No Derivatives 4.0 International
Views:314
Downloads:41
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:KTFMB - FKKT
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Secondary language

Language:English
Title:Immobilization of palladium to porous crosslinked poly(4-vinylpyridine)
Abstract: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.
Keywords:functional porous polymers, polyHIPE, 4-vinylpyridine, palladium, Friedel-Krafts method for crosslinking


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