| | SLO | ENG | Cookies and privacy

Bigger font | Smaller font

Show document Help

Title:Sinteza in karakterizacija vanilin metakrilata kot prekurzorja za visoko porozne polimere : diplomsko delo visokošolskega strokovnega študijskega programa I. stopnje
Authors:ID Mraz, Maja (Author)
ID Paljevac, Muzafera (Mentor) More about this mentor... New window
ID Krajnc, Peter (Comentor)
Files:.pdf VS_Mraz_Maja_2024.pdf (5,14 MB)
MD5: C20F6BE2061A9FA76F781FF59597FCDB
 
Language:Slovenian
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:V okviru diplomske naloge smo si zadali dva glavna cilja: sintetizirati vanilin metakrilat (VMA) in ga uporabiti kot monomer pri nadaljnji polimerizaciji za sintezo poroznega polimera. Vanilin metakrilat smo sintetizirali iz vanilina in anhidrida metakrilne kisline pri različnih reakcijskih pogojih, kjer smo spreminjali čas reakcije (48 ur in 120 ur) in jo izvajali v različnih atmosferah (na zraku in v dušikovi atmosferi). Nastali vanilin metakrilat smo okarakterizirali z infrardečo (FTIR) spektroskopijo, jedrsko magnetno resonanco (NMR) in elementno analizo (EA). Na podlagi analiz smo pri vseh pogojih potrdili nastanek vanilin metakrilata. Ugotovili smo, da je učinkovitost reakcije boljša pri daljšem reakcijskem času in v prisotnosti inertne atmosfere. Nato smo iz VMA in etilen glikol dimetakrilata (EGDMA) pripravili kopolimer poli(VMA-ko-EGDMA) s polimerizacijo v raztopini in s polimerizacijo kontinuirane faze emulzije z visokim deležem notranje faze (HIP emulzije). V obeh primerih je polimerizacija potekala s fotoiniciatorjem Irgacure 819. Pri polimerizaciji v raztopini smo kot topilo uporabili različne deleže toluena, da bi raziskali vpliv topila na morfologijo polimera. Nastali poli(VMA-ko-EGDMA) smo okarakterizirali s FTIR spektroskopijo, elementno analizo, vrstičnim elektronskim mikroskopom (SEM) za preučevanje morfologije monolitov in porozimetrom po Brunauer-Emmett-Teller (BET) metodi za določevanje specifične površine materiala. Neporozen polimer smo dobili le pri najnižji vsebnosti toluena, medtem ko smo pri višjih vsebnostih dobili porozen material. Pri polimerizaciji HIP emulzije smo poleg VMA in EGDMA uporabili še surfaktant Hypermer B246 za stabilizacijo emulzije, kot notranjo fazo pa vodno raztopino kalcijevega klorida heksahidrata. Nastali poli(VMA-ko-EGDMA) monoliti so bili zelo krhki, zato smo v monomerno fazo dodali še monomer 2-etilheksil akrilat (EHA), ki poveča prosti volumen polimera in s tem elastičnost materiala, kar se je v našem primeru tudi potrdilo. Nastale poli(VMA-ko-EGDMA) in poli(VMA-ko-EGDMA-ko-EHA) monolite smo nato okarakterizirali s FTIR spektroskopijo, elementno analizo, vrstičnim elektronskim mikroskopom in porozimetrom. S FTIR spektroskopijo in elementno analizo smo dokazali vključitev monomerov v polimerno verigo, s SEM-om pa smo ugotovili, da imajo poli(VMA-ko-EGDMA) monoliti odprto celično strukturo, medtem ko je pri poli(VMA-ko-EGDMA-ko-EHA) morfologija bikontinuirna.
Keywords:porozni polimeri, HIP – emulzija, poliHIPE, vanilin metakrilat
Place of publishing:Maribor
Place of performance:Maribor
Publisher:M. Mraz
Year of publishing:2024
Number of pages:1 spletni vir (1 datoteka PDF (X, 44 F.))
PID:20.500.12556/DKUM-90252 New window
UDC:539.217:678.744.33(043.2)
COBISS.SI-ID:216999171 New window
Publication date in DKUM:10.09.2024
Views:215
Downloads:140
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
:
Copy citation
  
Average score:(0 votes)
Your score:Voting is allowed only for logged in users.
Share:Bookmark and Share



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

Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:27.08.2024

Secondary language

Language:English
Title:Synthesis and characterization of vanillin methacrylate as a precursor for highly porous polymers
Abstract:In this work, we set two main goals: to synthesize vanillin methacrylate (VMA) and to use it as a monomer in further polymerization to synthesize a porous polymer. We synthesized vanillin methacrylate from vanillin and methacrylic anhydride under different reaction conditions, varying the reaction time (48 hours and 120 hours) and carrying out the reactions in different atmospheres (in air and nitrogen). The resulting vanillin methacrylate was characterized by infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (NMR) and elemental analysis (EA). Based on the analyses, we were able to confirm the formation of vanillin methacrylate under all conditions. We found that the reaction efficiency was higher with a longer reaction time and in the presence of an inert atmosphere. Next, we prepared the copolymer poly(VMA-co-EGDMA) from VMA and ethylene glycol dimethacrylate (EGDMA) by solution polymerization and high internal phase emulsion (HIPE) polymerization. In both cases, the polymerization was carried out with the photoinitiator Irgacure 819. In the solution polymerization, we used different proportions of toluene as a solvent to investigate the effects of the solvent on the morphology of the polymer. The resulting poly(VMA-co-EGDMA) was characterized by FTIR spectroscopy, elemental analysis, scanning electron microscopy (SEM) to study the morphology of the monoliths and a Brunauer-Emmett-Teller (BET) porosimeter to determine the specific surface area of the material. We obtained a non-porous polymer only at the lowest toluene content, while a porous material was formed at higher toluene contents. In the HIPE polymerization, in addition to VMA and EGDMA, we also used the surfactant Hypermer B246 to stabilize the emulsion, with an aqueous solution of calcium chloride hexahydrate as the inner phase. The resulting poly(VMA-co-EGDMA) monoliths were very brittle, which is why we added the monomer 2-ethylhexyl acrylate (EHA) to the monomer phase, which increases the free volume of the polymer and thus the elasticity of the material, which was also confirmed in our case. The resulting poly(VMA-co-EGDMA) and poly(VMA-co-EGDMA-co-EHA) monoliths were then characterized by FTIR spectroscopy, elemental analysis, scanning electron microscopy and porosimetry. FTIR spectroscopy and elemental analysis confirmed the incorporation of the monomers into the polymer chain, while SEM analysis revealed that the poly(VMA-co-EGDMA) monoliths have an open-cell structure, whereas the poly(VMA-co-EGDMA-co-EHA) morphology is bicontinuous.
Keywords:porous polymers, HIP – emulsion, polyHIPE, vanillin methacrylate


Comments

Leave comment

You must 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