Kemiluminiscenca kot vir fotopolimerizacije

Utroša, Petra

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Title:	Kemiluminiscenca kot vir fotopolimerizacije
Authors:	ID Utroša, Petra (Author) ID Iskra, Jernej (Mentor) More about this mentor... ID Krajnc, Peter (Comentor)
Files:	UN_Utrosa_Petra_2015.pdf (1,54 MB) MD5: 8A24A04DCD8F9798C5082FA276507198
Language:	Slovenian
Work type:	Bachelor thesis/paper
Typology:	2.11 - Undergraduate Thesis
Organization:	FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:	V tem diplomskem delu je raziskana možnost uporabe kemiluminiscence kot vira fotopolimerizacije. Pri fotopolimerizaciji sproži svetloba kemijsko, običajno radikalsko reakcijo, kar vodi v nastanek polimera. Za številna področja so zelo uporabni hiperzamreženi polimeri, pomembna metoda pri njihovi sintezi pa so emulzijske polimerizacije. Za pripravo takih materialov pri sobni temperaturi lahko uporabimo svetlobo kot iniciator, vendar le-ta težko prodre v emulzijo, zaradi česar je manj učinkovita. Zanimalo nas je, ali lahko za to uporabimo kemiluminiscenco, ki označuje proces, pri katerem pride zaradi kemijske transformacije do emisije svetlobe – na ta način bi in situ generirali svetlobo znotraj emulzije. Najbolj učinkovite so reakcije peroksalatnega tipa, kjer pri reakciji vodikovega peroksida in oksalata nastane visokoenergijski intermediat, energija pa se prenese na molekulo občutljivca, ki oddaja vidno svetlobo. V ta namen smo pripravili bis(2,4,6-triklorofenil) oksalat in poiskali najbolj učinkovito sintetsko pot s spreminjanjem topila, časa in temperature. Za reakcijo kemiluminiscence je potreben tudi občutljivec, od katerega je odvisna intenziteta in valovna dolžina izsevane svetlobe, zato smo preizkusili različne občutljivce in s pomočjo optičnega mikroskopa spremljali njihovo emisijo. Nadalje smo preizkusili tudi številne monomere in fotoiniciatorje ter poiskali ustrezen sistem, v katerem vidna svetloba sproži polimerizacijo. Sistem smo nadgradili s tvorbo stabilne emulzije za sintezo hiperzamreženih polimerov. Nazadnje smo stremeli k združitvi reakcije polimerizacije z reakcijo kemiluminiscence, pri čemer bi v emulziji generirana svetloba sprožila nastanek polimera.
Keywords:	kemiluminiscenca, fotopolimerizacija, bis(2, 4, 6-triklorofenil) oksalat, vodikov peroksid
Place of publishing:	Maribor
Publisher:	[P. Utroša]
Year of publishing:	2015
PID:	20.500.12556/DKUM-54470
UDC:	66.095.26.085(043.2)
COBISS.SI-ID:	19084822
NUK URN:	URN:SI:UM:DK:JUIPCEAA
Publication date in DKUM:	22.10.2015
Views:	1993
Downloads:	170
Metadata:
Categories:	KTFMB - FKKT
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Secondary language

Language:	English
Title:	Chemiluminescence as source of photopolymerization
Abstract:	This thesis shows how chemiluminescence can be used as a source of photopolymerization. In photopolymerization it is light that activates a chemical, generally radical reaction that leads to formation of a polymer. Of great use nowadays are cross-linked polymers, and emulsions present an important method of their preparation. Polymerization of such materials at room temperature may occur by using light as an initiator, but as emulsions are rather opaque, the light cannot completely access the reaction mixture, consequently being less effective. Thus we have studied the prospect of using chemiluminescence as a light source from within the emulsion, as it is a reaction in which light is obtained as the product of chemical transformation. The most efficient are peroxyoxalate chemiluminiscence reactions, in which an electronically excited state is formed when hydrogen peroxide reacts with an oxalate. The energy may be transmitted to a fluorophore, causing it to emit light. For purpose of our study we have focused on the preparation of bis(2,4,6-trichlorophenyl) oxalate by changing time and solvents in already known synthesis, to find a reaction with the greatest yield. As the chemiluminescence depends significantly on the choice of the fluorophore, we have conducted various experiments to find a fluorophore with a suitable light intensity and wavelength for further analysis of photopolymerization. Moreover, many monomers and photoinitiators had to be tested to find an appropriate system that reacted only when activated by visible light. When such systems were found, we continued to make stable emulsions with them, suitable for synthesis of cross-linked polymers. Lastly the reactions of chemiluminescence and photopolymerization had to be merged into one system, one triggering another to provide an efficient way of photopolymerization in an emulsion.
Keywords:	chemiluminescence, photopolymerization, bis(2, 4, 6-trichlorophenyl) oxalate, hydrogen peroxide

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