| | SLO | ENG | Cookies and privacy

Bigger font | Smaller font

Show document

Title:OPTIMIZACIJA POVRŠINSKIH LASTNOSTI MAKROPOROZNIH POLIAKRILATOV
Authors:Bratuša, Ana (Author)
Krajnc, Peter (Mentor) More about this mentor... New window
Kolar, Mitja (Co-mentor)
Files:.pdf UNI_Bratusa_Ana_2014.pdf (2,19 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 predstavljamo pripravo poroznih polimernih materialov s tehniko sintranja poli(metil metakrilatnih) (PMMA) zrn. Nov polimerni material smo sintetizirali s polimerizacijo v vmesnih prostorih med zrni. Sintrana zrna so nam tako služila kot nosilec, prek katerega smo nanesli monomerno mešanico in jo polimelizirali. Prelit nosilec je bilo nato treba očistiti v ustreznem topilu, ki je omogočalo odstranitev sintranih zrn iz na novo sintetiziranega materiala in s tem nastanek porozne strukture. Pri izboru topila smo bili zato omejeni na dva pogoja, tj. izbrano topilo je moralo dobro raztapljati poli(metil metakrilatna) (PMMA) zrna, medtem ko nanešenega polimeliziranega materiala ni smelo topiti. Za pripravo primerno sintranih nosilcev je bilo najprej treba določiti optimalne pogoje (temperaturo in čas sintranja), pri katerih se zrna najmočneje in najbolje spojijo. Kot najbolj optimalno se je izkazalo sintranje pri 180 °C 24 h. Za dosego optimalnih rezultatov je bilo v postopek priprave sintranih nosilcev treba vključiti še predhodno stresanje zrn, ki je omogočilo zmanjšanje praznin med nasutimi zrni in s tem boljše stikanje samih zrn, kar je pripomoglo k večji končni poroznosti na novo pripravljenega polimernega materiala. Z zgoraj opisano tehniko smo tako pripravili dva porozna polimerna materiala. To sta alifatski uretanski diakrilat (AUD) in bisfenol A glicerolat (1-glicerol/fenol) dimetakrilat (Bis GMA). Oba sta nastala s porozno strukturo, sestavljeno iz primarnih por, ki jih medsebojno povezujejo manjše, povezovalne pore. Primarne pore zasedajo mesta, kjer se je pred čiščenjem novega polimera nahajal sintran nosilec, povezovalne pore pa so se izoblikovale na stičnih mestih sintranih zrn.
Keywords:poli(metil metakrilat), porozni polimeri, polimerni nosilci, sintranje, polimerizacija
Year of publishing:2014
Publisher:[A. Bratuša]
Source:Maribor
UDC:544.556(043.2)
COBISS_ID:18219542 Link is opened in a new window
NUK URN:URN:SI:UM:DK:KUOKTKLV
Views:1172
Downloads:148
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:OPTIMISATION OF SURFACE PROPERTIES OF MACROPOROUS POLYACRYLATES
Abstract:In the graduation thesis, we present the preparation of porous polymeric materials with the technique of sintering poly(methyl methacrylate) (PMMA) beads. We synthesized the new polymeric material with polymerization in spaces between the beads. Sintered beads were used as a carrier that helped us achieve porosity in the final polymeric material. Furthermore, the preformed carrier had to be subsequently dissolved in a suitable solvent to enable the abstraction of sintering beads from the newly synthesized material and by that the emergence of the porous structure. That is why we were limited to two conditions when choosing the solvent - it had to dissolve poly(methyl methacrylate) beads, but not the polymerized material. For the preparation of sintered carriers, it was first necessary to determine the optimal conditions, such as temperature and time of the sintering, at which the merging of the beads would be appropriate for achieving the final interconnected porous structure. Sintering at 180°C for 24 hours proved to be the most optimal. To get the optimal results, preliminary shaking of the beads had to be included into the procedure. This enabled a decrease of the empty spaces between the beads, and with that a better contact between the beads which resulted in the larger final porosity of the newly prepared polymeric material. We prepared two porous polymeric materials with the technique summarized above namely are aliphatic urethane diacrylate (AUD) and bisphenol-A-glycidyl (1-glycerol/phenol) dimethacrylate (Bis-GMA). Both showed a porous structure, composed of primary pores which are interconnected by smaller, connective pores. The primary pore took up the place where the beads were located prior to the PMMA dissolving, while the smaller ones were created at the contact points of the sintering beads.
Keywords:poly(methyl methacrylate), porous polymers, polymer carrier, sintering, polymerization


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