SINTEZA ZAMREŽENEGA POLI(4-VINILPIRIDINA)

Cmager, Nuša

| | SLO | ENG | Piškotki in zasebnost

Večja pisava | Manjša pisava

Prva stran > Izpis gradiva

Izpis gradiva

Naslov:	SINTEZA ZAMREŽENEGA POLI(4-VINILPIRIDINA)
Avtorji:	ID Cmager, Nuša (Avtor) ID Iskra, Jernej (Mentor) Več o mentorju... ID Krajnc, Peter (Komentor)
Datoteke:	UN_Cmager_Nusa_2016.pdf (2,12 MB) MD5: 85FE3DC65AB18A6C718B6B1115D26082
Jezik:	Slovenski jezik
Vrsta gradiva:	Diplomsko delo/naloga
Tipologija:	2.11 - Diplomsko delo
Organizacija:	FKKT - Fakulteta za kemijo in kemijsko tehnologijo
Opis:	V diplomski nalogi smo pripravili porozne kopolimere 4-vinilpiridina zamrežene z divinilbenzenom s polimerizacijo kontinuirne faze emulzije z visokim deležem notranje faze. Tehniko emulzije z visokim deležem notranje faze smo izbrali zaradi tvorbe visoko poroznih polimernih materialov, ki jih lahko uporabimo v pretočnih tehnikah. Zanimalo nas je, ali lahko pripravimo naknadno zamrežen kopolimer s piridinskimi molekulami. Pri pripravi poroznih materialov smo spreminjali razmerje monomerov, vrsto in delež lipofilnih neionskih surfaktantov ter delež interne faze. Rezultat je bila stabilna emulzija, ki je po polimerizaciji v peči tvorila polimer z značilnimi makroporami. Z vrstično elektronsko mikroskopijo smo proučili morfologijo dobljenih polimerov. Pripravljene poliHIPE monolite smo naknadno zamrežili in s tem tvorili majhne povezovalne pore, s čimer smo povečali specifično površino materiala. Tako pripravljene polimere smo testirali v vlogi poroznega katalizatorja na reakciji esterifikacije. Želeli smo uporabiti prednosti HIPE polimerov za reakcije, v katerih je pomemben dodatek piridina. Zanimalo nas je, ali lahko uporabimo sintetiziran kopolimer za namene ločitve stranskega produkta od glavnega. S preprosto filtracijo bi odstranili polimer in se tako izognili zahtevnim oblikam ločevanja produktov. Med seboj smo primerjali osnoven polimer, polimer naknadno zamrežen v prahu in polimer naknadno zamrežen v kosu. Zanimalo nas je, ali hiperzamreženje poveča vlogo piridinskega polimera kot lovilca kisline pri reakciji estrenja.
Ključne besede:	porozni polimeri, 4-vinilpiridin, poliHIPE, hiperzamreženje, esterifikacija
Kraj izida:	Maribor
Založnik:	[N. Cmager]
Leto izida:	2016
PID:	20.500.12556/DKUM-62452
UDK:	66.095.26(043.2)
COBISS.SI-ID:	20338710
NUK URN:	URN:SI:UM:DK:Q9MTZMKW
Datum objave v DKUM:	16.09.2016
Število ogledov:	2291
Število prenosov:	256
Metapodatki:
Področja:	KTFMB - FKKT
:	Kopiraj citat

Skupna ocena:	(0 glasov)
Vaša ocena:	Ocenjevanje je dovoljeno samo prijavljenim uporabnikom.
Objavi na:

Postavite miškin kazalec na naslov za izpis povzetka. Klik na naslov izpiše podrobnosti ali sproži prenos.

Sekundarni jezik

Jezik:	Angleški jezik
Naslov:	SYNTHESIS OF CROSS-LINKED POLY(4-VINYLPYRIDINE)
Opis:	In this diploma thesis, we prepared porous copolymers of 4-vinylpyridine crosslinked with divinylbenzene by polymerizing the continuous phase of the emulsion with a high proportion of internal phase. The emulsion technique with a high proportion of internal phase was chosen due to the formation of highly porous polymeric materials, which can be applied in streaming techniques. We have been interested in whether we can prepare subsequently crosslinked copolymer with pyridine molecules. In preparing the porous materials, there was varying the ratio of monomers, the type and the proportion of lipophilic non-ionic surfactants, and the proportion of internal phase. The result was a stable emulsion, which after polymerizing in an oven formed a polymer with characteristic macropores. By line electron microscopy, we studied the morphology of obtained polymers. Prepared poliHIPE monoliths were subsequently crosslinked and thus formed small connecting pores, by which we increased the specific surface of the material. In this way prepared polymers were tested in the role of the porous catalyst in the esterification reaction. We wanted to apply the advantages of HIPE polymers for reactions in which there was a major addition of pyridine. We have been interested in whether we can use the synthesized copolymer for purposes of separating the byproduct from the main one. By simple filtration the polymer would be removed, and we could thus avoid the complex forms of separating products. We compared each other the basic polymer, the polymer subsequently crosslinked in powder, and the polymer subsequently crosslinked in a piece. We have been interested in whether the hyper-crosslinking increases the role of the polymer as an acid trap in the esterification reaction.
Ključne besede:	porous polymers, 4-vinylpyridine, polyHIPE, hyper-crosslinking, esterification

Komentarji

Dodaj komentar

Za komentiranje se morate prijaviti.

Komentarji (0)

0 - 0 / 0

Ni komentarjev!

Nazaj