prikaz prve stranice dokumenta Polisiloksanski gelovi s izabranim organskim otapalima i komponentama etanol-klorbenzenskoga dozimetrijskoga sustava
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doctoral thesis
Polisiloksanski gelovi s izabranim organskim otapalima i komponentama etanol-klorbenzenskoga dozimetrijskoga sustava
Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology, 2020. urn:nbn:hr:149:024825
Cetina, Ivana
University of Zagreb
Faculty of Chemical Engineering and Technology

Institutional repository: Repository of Faculty of Chemical Engineering and Technology University of Zagreb

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Cetina, I. (2020). Polisiloksanski gelovi s izabranim organskim otapalima i komponentama etanol-klorbenzenskoga dozimetrijskoga sustava (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:149:024825

Cetina, Ivana. "Polisiloksanski gelovi s izabranim organskim otapalima i komponentama etanol-klorbenzenskoga dozimetrijskoga sustava." Doctoral thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2020. https://urn.nsk.hr/urn:nbn:hr:149:024825

Cetina, Ivana. "Polisiloksanski gelovi s izabranim organskim otapalima i komponentama etanol-klorbenzenskoga dozimetrijskoga sustava." Doctoral thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2020. https://urn.nsk.hr/urn:nbn:hr:149:024825

Cetina, I. (2020). 'Polisiloksanski gelovi s izabranim organskim otapalima i komponentama etanol-klorbenzenskoga dozimetrijskoga sustava', Doctoral thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, accessed 22 November 2024, https://urn.nsk.hr/urn:nbn:hr:149:024825

Cetina I. Polisiloksanski gelovi s izabranim organskim otapalima i komponentama etanol-klorbenzenskoga dozimetrijskoga sustava [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology; 2020 [cited 2024 November 22] Available at: https://urn.nsk.hr/urn:nbn:hr:149:024825

I. Cetina, "Polisiloksanski gelovi s izabranim organskim otapalima i komponentama etanol-klorbenzenskoga dozimetrijskoga sustava", Doctoral thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb, 2020. Available at: https://urn.nsk.hr/urn:nbn:hr:149:024825

Metadata
TitlePolisiloksanski gelovi s izabranim organskim otapalima i komponentama etanol-klorbenzenskoga dozimetrijskoga sustava
Title (english)Polysiloxane gels with selected organic solvents and components of ethanol-chlorobenzene dosimetric system
AuthorIvana Cetina
MentorDanijela Ašperger (mentor)
MentorIrina Pucić (mentor)
Committee memberEmi Govorčin-Bajsić (predsjednik povjerenstva)
Committee memberVilko Mandić (član povjerenstva)
Committee memberTanja Jurkin (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Chemical Engineering and Technology
Zagreb
Defense date and country2020-06-29, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Physical Chemistry
Universal decimal classification
(UDC)		54 - Chemistry. Crystallography. Mineralogy
Abstract
Za pripremu gelova na bazi polisiloksana odabrano je šest strukturno različitih alifatskih amina: bis(heksametilen)triamin (BHMTA), 1,3-diamino-2-propanol (DAP), dietilentriamin (DETA), tris(2-aminoetil)amin (TAEA), tetraetilenpentamin (TEPA) i trietilentetramin (TETA). Svi amini su reagirali s diglicidil-eter-terminiranim poli(dimetil-siloksanom) (PDMS-DGE) na relativno niskoj temperaturi od 50 ºC. U reakcijama bez prisutnosti tekuće komponente dobivene su stabilne prozirne gelne mreže. Gelovi različite stabilnosti dobiveni su dodavanjem odabrane tekuće komponente u reakcijski sustav. Za tekuće komponente odabrana su organska otapala s niskim vrelištima te njihove smjese, uključujući ECB dozimetrijsku otopinu. Odnos Hansenovih parametara topljivosti (HSP) tekućih komponenti i svojstava dobivenih gelnih mreža i gelova istražen je s različitim eksperimentalnim tehnikama. Rezultati ATR-FTIR i Raman spektroskopije dopunjeni su teorijskom vibracijskom analizom baziranom na teoriji funkcionala gustoće (DFT) kako bi se potvrdila točnost asignacije. U FTIR spektrima gelnih mreža apsorpcije primarnih i sekundarnih amina povezane su s dosegom reakcije pripreme kao i s promjenama nastalim djelovanjem gama-zračenja (D = 50 kGy). Kombinacijom tih rezultata s onima Soxhlet ekstrakcije, bubrenja, toplinske analize (DSC), dielektrične spektroskopije i reoloških mjerenja pokazano je da je vrsta amina s kojim je provedena reakcija najviše utjecala na svojstva gelnih mreža i gelova na osnovi PDMS-a. Amini koji su mogli stvarati vodikove veze ili vezati više PDMS lanaca davali su gušće i stabilnije polimerne mreže. Iako su koncentracije tekućih komponenti u gelovima bile znatne (23 – 40 masenih %), na svojstva gelova je najviše utjecala vrsta amina. Stabilni i čvrsti gelovi priređeni su s onim tekućim komponentama čiji su Hansenovi parametri topljivosti slični onom od PDMS-a, bez obzira što te komponente nisu stvarale međumolekulske interakcije. Iako se očekivalo da će stvarati vodikove veze, gelovi koji su sadržavali alkohole bili su meki jer su Hansenovi parametri topljivosti alkohola značajno veći od onog PDMS-a. Neki od tih mekih gelova imali su svojstvo samoobnavljanja. Izlaganje gama-zračenju kod većine gelnih mreža i gelova uzrokovalo je samo neznatnu degradaciju. Stoga se može zaključiti da su gelne mreže i gelovi bazirani na PDMS-u priređeni niskotemperaturnom reakcijom s alifatskim aminima stabilni prema gama-zračenju najmanje do D = 50 kGy. To se također odnosi i na gelove koji su sadržavali ECB dozimetrijsku otopinu.
Abstract (english)
In order to prepare polysiloxane-based gels six structurally different amines were selected: bis(hexamethylene)triamine (BHMTA), 1,3-diamino-2-propanol (DAP), diethylenetriamine (DETA), tris(2-aminoethyl)amine (TAEA), tetraethylenepentamine (TEPA) and triethylenetetramine (TETA). All the amines reacted with diglycidyl ether terminated poly(dimethylsiloxane) (PDMS-DGE) at a relatively low temperature of 50 ºC. In reactions without a liquid component stable transparent gel-networks were obtained. Gels of various stability were prepared by adding a liquid component to reaction system. As liquid components low boiling point organic solvents and their mixtures including ECB dosimetric solution were selected. A number of analytical techniques were used to assess the relationship between Hansen solubility parameters (HSP) and gel properties. Results obtained by ATR-FTIR and Raman spectroscopies were complemented by theoretical vibration analysis based on density functional theory (DFT) to confirm the assignations. Primary and secondary amine absorptions in FTIR-spectra of gel-networks were correlated to preparation reaction extent and to the changes caused by gamma radiation (D = 50 kGy). By combining those results with the ones of Soxhlet extraction, swelling, thermal analysis (DSC), dielectric spectroscopy and rheological measurements it was shown that the amine reagent was the most important factor that determined the properties of studied PDMS-based gel-networks and gels. Amines that were able to form hydrogen bonds or to bond more PDMS chains produced denser and more stable networks. Although the concentration of liquid components in gels was significant (23 – 40 weight %), amine type still had the greatest impact on the gel properties. Stable and firm gels were produced with liquid components that had Hansen solubility parameters close to that of PDMS, regardless of the fact that these components did not form intermolecular interactions. Hansen solubility parameters of alcohols were higher than the one for PDMS so alcohols produced soft gels, although it was expected that hydrogen bonds will be formed. Some of those soft gels exhibited self-healing properties. Gamma irradiation caused slight degradation of most gel-networks and gels. Thus it may be concluded that low temperature amine cured PDMS-based gels, are stable to gamma irradiation at least to D = 50 kGy. The same applies to the gels containing ECB dosimetric solution.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:149:024825
Promotion2020
Study programmeTitle: Chemical Engineering and Applied Chemistry - Doctoral course
Study programme type: university
Study level: postgraduate
Academic / professional title: doktor/doktorica znanosti, područje prirodnih znanosti, polje kemija (doktor/doktorica znanosti, područje prirodnih znanosti, polje kemija)
Type of resourceText
Extent212 str. ; 30 cm
File originBorn digital
Access conditionsClosed access
Terms of useLicence In copyright icon
Created on2023-06-05 12:17:02