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Mikroinkapsulacija trdnega jedrnega materiala z melaminsko formaldehidno smolo
ID Novak, Špela (Author), ID Alič, Branko (Mentor) More about this mentor... This link opens in a new window

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Abstract
V diplomskem delu sem proučevala vpliv kontroliranega zniževanja in zviševanja pH vrednosti na inkapsulacijo treh različnih jedrnih materialov po treh različnih postopkih. Za trdni jedrni material sem si izbrala gvajakol-furfuril benzoksazin, 4,4'-bismaleimid-difenilmetan in N-fenilmaleimid. Procesni parametri, kot so temperatura in hitrost mešanja so bili pri vseh inkapsulacijah identični. Proces inkapsulacije se je za vse tri postopke pričel enako. Vsebino zmesi v reaktorju sem pred začetkom inkapsulacije uravnala na pH 8, nato pa sem glede na postopek uravnavala pH vrednost reakcijske zmesi. Z diferenčno dinamično kalorimetrijo in elektronsko mikroskopijo sem ugotovila, da se je samo v primeru uporabe 4,4'-bismaleimid-difenilmetana kot jedrnega materiala le-ta uspešno in popolnoma inkapsuliral. Prav tako sem ugotovila, da se z večkratnim višanjem in sledečim zniževanjem pH vrednosti iz 6 na 8, stena mikrokapsul izboljšuje oziroma postane debelejša.

Language:Slovenian
Keywords:mikroinkapsulacija, in situ polimerizacija, melamin-formaldehidna smola, diferenčna dinamična kalorimetrija, elektronska vrstična mikroskopija, trdni jedrni material.
Work type:Bachelor thesis/paper (mb11)
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Technology
Year:2020
COBISS.SI-ID:33574659 This link opens in a new window
Publication date in RUL:14.09.2020
Views:380
Downloads:105
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Secondary language

Language:English
Title:Micro-encapsulation of solid core material with melamine formaldehyde resin
Abstract:
In my dissertation, I studied the effect of controlled lowering and raising of the pH value on the encapsulation of three different core materials by three different procedures. I chose guaiacol-furfuryl benzoxazine, 4,4'-Bismaleimidodiphenylmethane and N-Phenylmaleimide as the solid core material. Process parameters such as temperature and mixing speed were identical in all encapsulations. The encapsulation process began the same for all three procedures. The content of the mixture in the reactor was adjusted to pH 8 before encapsulation, and then the pH of the reaction mixture was adjusted according to the procedure. By differential dynamic calorimetry and electron microscopy, I found that only in the case of the use of 4,4'-Bismaleimidodiphenylmethane as a core material the encapsulation was successfull and complete. I also found that with a multiple increase and subsequent decrease in pH from 6 to 8, the wall of the microcapsules improves or becomes thicker.

Keywords:microencapsulation, in situ polymerization, melamine-formaldehyde resin, differential dynamic calorimetry, electron scanning microscopy, solid core material.

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