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Title:Mehanske lastnosti hiperzamreženih polimerov
Authors:Švajger, Mateja (Author)
Krajnc, Peter (Mentor) More about this mentor... New window
Paljevac, Muzafera (Co-mentor)
Files:.pdf UN_Svajger_Mateja_2016.pdf (2,92 MB)
 
Language:Slovenian
Work type:Undergraduate thesis (m5)
Typology:2.11 - Undergraduate Thesis
Organization:FNM - Faculty of Natural Sciences and Mathematics
Abstract:V diplomskem delu smo želeli preučiti ali vpliva naknadno zamreženje oz. hiperzamreženje poli (stiren-ko-divinilbenzena) na mehanske lastnosti polimernih struktur. Pripravili smo HIP emulzije, pri katerih smo uporabili monomera stiren in divinilbenzen, pri čemer je divinilbenezen služil kot zamreževalo, z različno stopnjo zamreženosti. Dobljenemu poliHIPE materialu smo z adsorpcijo/desorpcijo dušika po BET metodi izmerili specifično površino. Ugotovili smo, da stopnja zamreženja ni bistveno vplivala na specifično površino materiala, najvišja razlika je pri vzorcu MS17, ki je bil 40 mol % zamrežen in MS22, ki je bil 80 mol % zamrežen, kar pomeni, da je vseboval samo zamreževalo. S pomočjo FTIR spektrov smo potrdili kemijsko sestavo pripravljenih polimernih monolitov. Morfologijo smo preverili z vrstično elektronsko mikroskopijo. Monolite smo hiperzamrežili, za reakcijo hiperzamreženja smo izbrali di-tert-butil peroksid kot iniciator radikalske polimerizacije preostalih vinilnih skupin, kot topilo smo uporabili toluen. Tudi tem vzorcem smo z adsorpcijo/desorpcijo dusika po BET metodi izmerili specifično površino. Ugotovili smo, da ja naknadno zamreženje vplivalo na povečanje specifične površine materiala. Specifična površina se je največ povečala pri vzorcu MS22 in sicer iz 73,7 m2g-1 na 195,7 m2g-1 in s tem ima najvišji faktor povečanja specifične površine vrednost 2,65. Vzorcema MS17 in MS22 smo pred in po zamreženjem določili mehanske lastnosti po tritočkovnem upogibnem testu. Ugotovili smo, da so se mehanske lastnosti, elastičnost in raztezek ohranile.
Keywords:Polimer, polimerizacija, emulzija, poliHIPE materiali, hiperzamreženje, zamreženi polimeri, odprta celična struktura, mehanske lastnosti polimerov.
Year of publishing:2016
Publisher:[M. Švajger]
Source:Maribor
UDC:544.777:665.652.2(043.2)
COBISS_ID:22575624 Link is opened in a new window
NUK URN:URN:SI:UM:DK:ABIQEFJQ
Views:1132
Downloads:77
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:FNM
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Secondary language

Language:English
Title:Mechanical properties of hypecrosslinked polymers
Abstract:In this thesis, we wanted to examine whether the subsequent crosslinking or hyper crosslinking poly (styrene-co-divinylbenzene) effect the mechanical properties of the polymeric structures. We prepared a HIPE emulsion, in which we used a monomer of styrene and divinylbenzene, wherein divinylbenzene serve as the cross-link, with varying degrees of crosslinking. The resulting material was poliHIPE by adsorption/desorption of nitrogen by the BET method to measure the specific surface area. We have found that the degree of crosslinking is not significantly affected the specific surface area of the material, the maximum difference in the pattern of MS17, which was 40 mole % cross-linked, and MS22, which was 80 mole % cross-linked, which means that contained only crosslink. Using FTIR spectra we confirmed the chemical composition of the prepared polymer monoliths. The morphology was examined using scanning electron microscopy. We crosslink the monoliths, for reaction of crosslinking we chosen di-tert-butyl peroxide as an initiator of free-radical polymerization of the residual vinyl groups, as a solvent was used toluene. With the adsorption/desorption of nitrogen by the BET method to measure the specific surface area we also measure this samples. We have found that yes subsequent crosslinking effect on the increase of the specific surface area of the material. Specific surface area is increased more than in the sample MS22 namely from 73.7 m2g-1 at 195.7 m2g-1 and thus has the highest factor increases the specific surface area value of 2.65. Models MS17 and MS22 are before and after crosslinking determine the mechanical properties of the three-point bend test. We have found that the mechanical properties, elasticity and elongation retained.
Keywords:Polymer, polymerization, emulsion, poliHIPE materials, hiperzamreženje, cross-linked polymers, open cell structure, the mechanical properties of polymers.


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