A master thesis from Aalborg University
Fremstilling af vand-uopløste cyclodekstrin baseret fibre gennem elektrospinning og foto-krydsbinding
[Formation of Water-Insoluble Cyclodextrin-based Fibres by Electrospinning and Photo-Crosslinking]
Author(s)
Term
4. Term
Education
Publication year
2024
Submitted on
2024-06-02
Pages
114 pages
Abstract
Forurening af vand og luft er et fremherskende problem i hele verden, og nye løsninger for rensning er undersøgt. Fire krydsbundne cyclodekstrin polymere systemer er blevet syntetiseret og elektrospunnet sammen med en dextran polymer modificeret til at være UV-hærdende for at kunne fremstille vand uopløselige fibre. Cyclodekstrin polymererne er krydsbundne med enten epichlorohydrin, ethylene glycol diglycidyl ether, poly(ethylene glycol) diglycidyl ether eller dextran for at fremstille en polymer. Den UV-hærdende polymer af dextran er modificeret med benzophenone, en foto-krydsbinder, som gennem belysning med UV-lys danner kovalente bindinger. Gennem elektrospinning er fibre for alle typer, undtagen poly(ethylene glycol) diglycidyl ether, fremstillet. Parametrene for elektrospinning er optimeret: solvent, koncentration og spænding. De elektrospunne fibre er efterfølgende UV-hærdet, og dannelsen af vand uopløselige fibre er bekræftet ved en opløsningstest. Fibrenes morfologi er observeret med SEM både før og efter opløsningstest. Fibrenes evne til at absorbere er undersøgt ved brug af de aromatiske stoffer baseret på Trans-Anethole og 4-Allylanisole. Fibrene er i vand fasen bestemt til at absorbere 75-135% af det teoretiske potentiale af den mængde aromatisk stof som opløst beta-cyclodextrin absorbere.
Pollution of water and air is a prevalent issue all over the world, and new purification methods are being investigated. Four crosslinked cyclodextrin polymer systems are synthesised and electrospun along with a dextran polymer modified to be UV-curable, intending to elaborate water-insoluble fibres. The cyclodextrins are crosslinked with either epichlorohydrin, ethylene glycol diglycidyl ether, poly(ethylene glycol) diglycidyl ether or dextran to produce a polymer. The UV-curable polymer system consists of dextran modified with benzophenone, a photo crosslinker, which allows the formation of covalent bonds through UV-curing. Fibres are obtained through electrospinning for all polymers except the one containing poly(ethylene glycol) diglycidyl ether. The electrospinning parameters are optimised: solvent, concentration, and voltage. The electrospun fibres are then UV-cured, and a dissolution test confirms the formation of water-insoluble fibres. SEM is used to observe the morphology of the fibres before and after the dissolution test. The ability of the fibres to absorb aroma compounds based on Trans-Anethole and 4-Allylanisole are investigated. The fibres are found in the aqueous phase to absorb 75-135% of the theoretical potential of the amount of aroma compound that dissolved beta-cyclodextrin absorbs.
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