diplomsko delo
Povzetek
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.
Ključne besede
diplomska dela;polimeri;polimerizacija;emulzija;poliHIPE;hiperzamreženje;zamreženi polimeri;odprta celična struktura;mehanske lastnosti polimerov;
Podatki
Jezik: |
Slovenski jezik |
Leto izida: |
2016 |
Tipologija: |
2.11 - Diplomsko delo |
Organizacija: |
UM FNM - Fakulteta za naravoslovje in matematiko |
Založnik: |
[M. Švajger] |
UDK: |
544.777:665.652.2(043.2) |
COBISS: |
22575624
|
Št. ogledov: |
1891 |
Št. prenosov: |
156 |
Ocena: |
0 (0 glasov) |
Metapodatki: |
|
Ostali podatki
Sekundarni jezik: |
Angleški jezik |
Sekundarni naslov: |
Mechanical properties of hypecrosslinked polymers |
Sekundarni povzetek: |
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. |
Sekundarne ključne besede: |
theses;polymers;polymerization;emulsion;poliHIPE materials;cross-linked polymers;open cell structure;mechanical properties of polymers; |
Vrsta dela (COBISS): |
Diplomsko delo |
Komentar na gradivo: |
Univ. v Mariboru, Fak. za naravoslovje in matematiko, Oddelek za biologijo |
Strani: |
X, 44 f. |
ID: |
9153634 |