| | SLO | ENG | Cookies and privacy

Bigger font | Smaller font

Show document

Title:POROZNI ELASTOMERI NA OSNOVI POLIURETANOV
Authors:Marot, Matic (Author)
Krajnc, Peter (Mentor) More about this mentor... New window
Paljevac, Muzafera (Co-mentor)
Files:.pdf UN_Marot_Matic_2015.pdf (2,27 MB)
 
Language:Slovenian
Work type:Bachelor thesis/paper (mb11)
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:V diplomski nalogi so prikazani poskusi sinteze poroznega elastomera z uporabo fotopolimerizacije. Želeli smo sintetizirati elastomer z dobrimi mehanskimi lastnostmi, saj so porozni materiali po navadi krhki. Kot monomer smo uporabili alifatski uretanski diakrilat (AUD, Sartomer CN 965), ki smo ga dodali v emulzijo z visokim deležem notranje faze. Emulzijo smo mešali eno uro v bučki potopljeni v termostatirano vodo z mešalom pri 250 obratih na minuto. Nastale emulzije smo vlili v kalupe in spolimerizirali v UV komori, nato smo produkte očistili v izopropanolu in posušili. Posušene produkte smo analizirali s pomočjo vrstičnega elektronskega mikroskopa in FTIR spektroskopijo. Pri poskusih smo spreminjali pogoje, kot so temperatura, delež notranje faze, topila in surfaktana. Rezultati so pokazali tvorbo emulzij v širokem temperaturnem območju in pri različnih deležih interne faze, vendar so se nam produkti po sušenju precej skrčili, postali trdni in neelastični in nadaljnje analize v večini primerov niso pokazale lepo porozne strukture. Z namenom izboljšanja elastičnosti in poroznosti materiala smo k AUDju dodali različna zamreževala (MBAA in EGDMA) ter eksperimente izvedli v dušikovi atmosferi, saj prisotnost kisika v reakcijski zmesi lahko moti potek polimerizacije. Testirana zamreževala so izboljšala poroznost materiala, a so bili materiali precej bolj krhki, dušikova atmosfera pa je povzročila zgolj nastanek nehomogenih emulzij, ki niso dobro spolimerizirale.
Keywords:emulzije z visokim deležem notranje faze, porozni polimeri, elastomeri, fotopolimerizacija, zamreževala
Year of publishing:2015
Publisher:[M. Marot]
Source:Maribor
UDC:678.074:678.664(043.2)
COBISS_ID:19085334 Link is opened in a new window
NUK URN:URN:SI:UM:DK:2HPKXZLM
Views:830
Downloads:60
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:KTFMB - FKKT
:
  
Average score:(0 votes)
Your score:Voting is allowed only for logged in users.
Share:AddThis
AddThis uses cookies that require your consent. Edit consent...

Hover the mouse pointer over a document title to show the abstract or click on the title to get all document metadata.

Secondary language

Language:English
Title:POROUS ELASTOMERS BASED ON POLYURETHANES
Abstract:The graduation thesis shows attempts to synthesize a porous elastomer by means of photopolymerization. We wanted to synthesize an elastomer with good mechanical properties, because porous materials are usually brittle. As the monomer, we used an aliphatic urethane diacrylate (AUD, Sartomer CN 965), which was added into an emulsion with a high percentage of the internal phase. The emulsion was stirred for one hour in a flask immersed in thermostated water with a stirrer at 250 revolutions per minute. The resulting emulsion was poured into molds and polymerized in an UV oven, then the resulting product was purified in isopropanol and dried. Dried products were analyzed by means of a Scanning Electron Microscope and FTIR. In our experiments we varied the conditions, such as temperature and the proportion of internal phase, solvent, and surfactant. The results showed emulsion formation over a wide temperature range and at various portions of the internal phase, but the products shrunk significantly afer drying, became rigid and inelastic. Further analysis did not show a porous structure of the material in most casses. In order to improve the elasticity and porosity of the material we added different crosslinkers (MBAA and EGDMA) to our monomer and carried out some of our experiments in a nitrogen athmosphere, because the presence of oxygen in the reaction mixture can interfere with the course of polymerization. The tested crosslinkers improved porosity of the material, but the materials were more brittle. The usage of a nitrogen atmosphere resulted only in the formation of non-homogeneous emulsions that did not polymerize well.
Keywords:high internal phase emulsions, porous polymers, elastomers, photopolymerization, crosslinkers


Comments

Leave comment

You have to log in to leave a comment.

Comments (0)
0 - 0 / 0
 
There are no comments!

Back
Logos of partners University of Maribor University of Ljubljana University of Primorska University of Nova Gorica