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Title:Razvoj funkcionalno gradientnih makroporoznih polimerov z emulzijsko templacijo : diplomsko delo visokošolskega strokovnega študijskega programa I. stopnje
Authors:ID Mori, Lana (Author)
ID Paljevac, Muzafera (Mentor) More about this mentor... New window
ID Krajnc, Peter (Comentor)
Files:.pdf VS_Mori_Lana_2025.pdf (4,91 MB)
MD5: 5C6CFB1EF2C9CD204CA164250B1EBF7B
 
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 sintetizirali visoko porozne gradientne polimere z verižno radikalsko fotopolimerizacijo emulzij z visokim deležem notranje faze (HIPE). Polimere smo pripravili na dva načina: (i) s postopnim fotopolimeriziranjem po nanašanju vsake posamezne plasti in (ii) s fotopolimerizacijo na koncu, ko so bile vse plasti že nanešene. Pokazalo se je, da so bili polimeri, pripravljeni z enkratno fotopolimerizacijo na koncu, mehansko stabilnejši, medtem ko so se pri postopnem fotopolimeriziranju ponekod posamezne plasti ločile. Gradientnost smo dosegli s plastenjem emulzij, ki so se med seboj razlikovale v treh ključnih parametrih: (i) hitrosti mešanja pri pripravi emulzije (med 250 in 20 000 obrati/minuto), (ii) deležu notranje faze (med 60 vol.% in 90 vol.% glede na celoten volumen emulzije) ter (iii) razmerju monomerov metil metakrilata, etilen glikol dimetakrilata in glicidil metakrilata (kemijski sestavi). Vsi ostali parametri so ostali konstantni. Rezultati so pokazali, da je bila sinteza gradientnih polimerov uspešna. Pri različnih hitrostih mešanja se je gradientnost odražala v različni velikosti por vzdolž polimera: najmanjše pore so nastale pri najvišji hitrosti mešanja, največje pa pri najnižji. Podoben trend smo opazili tudi pri spreminjanju deleža notranje faze, kjer so največje pore nastale v plasti z najvišjim deležem notranje faze. Poleg tega je na gradientnost pomembno vplivala tudi kemijska sestava polimera – z variiranjem razmerja monomerov smo dosegli različne stopnje poroznosti in morfološke značilnosti vzdolž gradientne strukture. Polimere smo okarakterizirali z FTIR spektroskopijo in vrstično elektronsko mikroskopijo (SEM). FTIR spektroskopija je omogočila potrditev kemijske sestave in uspešnost polimerizacije, SEM pa je bil ključen za analizo morfologije, razporeditve ter velikosti por v gradientnih polimerih.
Keywords:metil metakrilat, makroporozni polimeri, poliHIPE, gradientni polimeri
Place of publishing:Maribor
Place of performance:Maribor
Publisher:L. Mori
Year of publishing:2025
Number of pages:1 spletni vir (1 datoteka PDF (IX, 39 str.))
PID:20.500.12556/DKUM-94378 New window
UDC:542.913:678.744.33(043.2)
COBISS.SI-ID:249604355 New window
Publication date in DKUM:10.09.2025
Views:165
Downloads:32
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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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:14.08.2025

Secondary language

Language:English
Title:Development of functionally gradient macroporous polymers via emulsion templating
Abstract:In this work, highly porous gradient polymers were synthesised by chain radical photopolymerisation of high internal phase emulsions (HIPEs). The polymers were prepared in two different ways: (i) by stepwise photopolymerisation after the deposition of each layer and (ii) by a single photopolymerisation at the end, after all layers had been deposited. It was found that the polymers prepared by a single photopolymerisation at the end exhibited higher mechanical stability, while the stepwise photopolymerisation occasionally resulted in partial delamination of individual layers. The gradient structure was achieved by layering emulsions that differed in three key parameters: (i) the mixing speed during emulsion preparation (between 250 and 20 000 rpm), (ii) the volume fraction of the inner phase (between 60 vol.% and 90 vol.% based on the total emulsion volume), and (iii) the monomer ratio of methyl methacrylate, ethylene glycol dimethacrylate, and glycidyl methacrylate (i.e., the chemical composition). All other parameters were kept constant. The results showed that the synthesis of gradient polymers was successful. At different mixing speeds, the gradient was reflected in the pore size distribution along the polymer: the smallest pores formed at the highest mixing speed, while the largest pores were observed at the lowest. A similar trend was observed when the internal phase content was varied, with the largest pores occurring in layers with the highest internal phase content. In addition, the chemical composition of the polymer also had a significant influence on the gradient structure – varying the monomer content resulted in different degrees of porosity and distinct morphological features along the gradient. The polymers were characterised using FTIR spectroscopy and scanning electron microscopy (SEM). FTIR spectroscopy confirmed the chemical composition and successful polymerisation, while SEM examination was crucial for analysing the morphology, pore distribution, and pore size in the gradient polymers.
Keywords:methyl methacrylate, macroporous polymers, polyHIPE, gradient polymers


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