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Preparation and properties of nanoparticles suspensions and their composites

dc.contributor.advisorPilić, Branka
dc.contributor.otherStoiljković, Dragoslav
dc.contributor.otherPilić, Branka
dc.contributor.otherMarinković, Aleksandar
dc.contributor.otherPavličević, Jelena
dc.creatorBera, Oskar
dc.date.accessioned2020-07-03T13:56:42Z
dc.date.available2020-07-03T13:56:42Z
dc.date.issued2012-06-18
dc.identifier.urihttps://www.cris.uns.ac.rs/DownloadFileServlet/Disertacija139401427553358.pdf?controlNumber=(BISIS)85618&fileName=139401427553358.pdf&id=1480&source=NaRDuS&language=srsr
dc.identifier.urihttp://nardus.mpn.gov.rs/handle/123456789/9972
dc.identifier.urihttps://www.cris.uns.ac.rs/record.jsf?recordId=85618&source=NaRDuS&language=srsr
dc.identifier.urihttps://www.cris.uns.ac.rs/DownloadFileServlet/IzvestajKomisije152403637968859.pdf?controlNumber=(BISIS)85618&fileName=152403637968859.pdf&id=11173&source=NaRDuS&language=srsr
dc.description.abstractU ovom radu pripremljeni su različiti polimerni i keramički nanostrukturni materijali, u cilju ispitivanja uticaja vrste i udela nanopunila (čađ, fuleren, silicijum(IV)oksid, aluminijum(III)oksid i titanijum(IV)oksid) na strukturu, reološko i toplotno ponašanje kompozita, dobijenih na osnovu stirena, metilmetakrilata i akrilamida, primenom različitih metoda sinteze. Ispitivan je uticaj prisustva različitog udela nanočestica (1, 3 i 5 % m/m) na kinetiku polimerizacije stirena, i na oblast prelaska u staklasto stanje polistirenskih hibridnih materijala. Sintetisana je i serija nanokompozita polimerizacijom metilmetakrilata u prisustvu čestica (silicijum(IV)oksid, aluminijum (III)oksid i titanijum(IV)oksid) različitih dimenzija i hidrofilnosti, ali istog zapreminskog udela (1 % v/v). Na osnovu primene izotermne diferencijalno skanirajude metode (DSC), razvijen je kinetički model za opisivanje dve razičite reakcije tokom polimerizacije vinilnih monomera (reakciju prvog reda i samoubrzanje), i izračunata je debljina međufaznog sloja polimera na čestici u cilju određivanja njegovog uticaja na temperaturu prelaska u staklasto stanje hibridnih materijala. Za ispitivanje strukture i morfologije polistiren/silicijum(IV)oksid nanokompozita dobijenih metodom isparavanja rastvarača, korišdene su infracrvena spektroskopija sa Furijeovom transformacijom (FT-IR) i skanirajuda elektronska mikroskopija (SEM). Radi utvrđivanja uticaja udela hidrofobnog silicijum(IV)oksida (2, 5, 10, 15 i 30 % m/m) na toplotnu postojanost polistirenskih materijala, primenjene su istovremena termogravimetrijska i diferencijalno skanirajuda analiza (TG-DSC). Takođe, određen je uticaj veličine čestice fulerena C60 i submikronske čestice čađi na reološka svojstva polistirenskih kompozita sintetisanih taloženjem polimera iz rastvora. Ispitivanjem reološkog ponašanja hibridnih materijala, proučavan je uticaj veličine čestica, molekulske mase polimera i indeksa polidisperznosti na viskoznost polistirenskih kompozita. Na osnovu in-situ reoloških analiza polimerizacije u toku želiranja suspenzije nanočestica aluminijum(III)oksida u vodenom rastvoru monomera metakrilamida i N,N’-metilenbisakrilamida, utvrđena je jaka katalitička aktivnost površine aluminijum(III)oksida na nastajanje slobodnih radikala. Radi nalaženja veze između željenih svojstava keramičkih proizvoda i načina njihovog dobijanja, proučavan je uticaj uslova vođenja polimerizacije na slaganje čestica u dobijenom odlivku i na gustinu krajnjeg sinterovanog proizvoda.sr
dc.description.abstractIn this work, polymeric and ceramic nanostructured materials were prepared using different methods, in order to investigate the influence of nanofiller content and its type (carbon black, fullerene, silica, alumina and titania) on the structure, rheological and thermal behavior of composites, based on styrene, methylmethacrylate and acrylamide. The effect of particles content (1, 3 and 5 wt. %) on the kinetics of styrene radical polymerization and on the glass transition temperature of polystyrene/silica composites was investigated. A series of polymethylmethacrylate nanocomposites containing 1 vol. % of silica, alumina or titania particles (differing in dimensions and surface properties) was obtained. On the basis of isothermal differential scanning calorimetry (DSC), the kinetic model for describing two reactions during vinyl monomer polymerization (first order and autoacceleration) was developed, and the thickness of interfacial layer formed on nanoparticle surface was determined, in order to investigate its influence on the glass transition temperature of polymethylmethacrylate hybrid materials. The structure and the morphology of polystyrene/silica nanocomposites prepared by solvent evaporation were investigated using Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The influence of  hydrophobic silica content (2, 5, 10, 15 and 30 wt. %) on polystyrene thermal stability was studied by simultaneous thermogravimetry and differential scanning calorimetry (TG-DSC). The effect of fullerene C60 and submicron carbon black particle size on rheological properties of polystyrene composites prepared by the rapid coprecipitation was determined. Following the rheology of hybrid melts, the influence of filler size, molecular weight and polydispersity of polymer matrix on the viscosity of polystyrene composites was studied. On the basis of in-situ rheology analysis of polymerization process during the gelation of alumina nanoparticles suspension in aqueous solution of methacrylamide and N,N’- methylene bisacrylamide monomers, the strong catalytic activity of alumina surface on the free radicals formation was determined. In order to find the correlation between desired properties of ceramic products and their preparation procedure route, the influence of polymerization conditions on the green body structure and sintered body density was studied in details.en
dc.languagesr (latin script)
dc.publisherУниверзитет у Новом Саду, Технолошки факултетsr
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/45022/RS//
dc.relationinfo:eu-repo/grantAgreement/MESTD/MPN2006-2010/166007/RS//
dc.rightsopenAccessen
dc.sourceУниверзитет у Новом Садуsr
dc.subjectSuspenzijesr
dc.subjectsuspensionsen
dc.subjectnanoparticlesen
dc.subjectkinetic modeling of polymerizationen
dc.subjectpolymer nanocompositesen
dc.subjectnanostructured ceramicsen
dc.subjectrheological and thermal properties of hybrid materialsen
dc.subjectnanočesticesr
dc.subjectmodelovanje kinetike polimerizacijesr
dc.subjectpolimerni nanokompozitisr
dc.subjectkeramički nanostrukturni materijalisr
dc.subjectreološka i toplotna svojstva hibridnih materijalasr
dc.titleDobijanje i karakterizacija suspenzija nanočestica i njihovih kompozitasr
dc.title.alternativePreparation and properties of nanoparticles suspensions and their compositesen
dc.typedoctoralThesissr
dc.rights.licenseBY
dcterms.abstractПилић, Бранка; Павличевић, Јелена; Маринковић, Aлександар; Пилић, Бранка; Стоиљковић, Драгослав; Бера, Оскар; Добијање и карактеризација суспензија наночестица и њихових композита; Добијање и карактеризација суспензија наночестица и њихових композита;
dc.identifier.fulltexthttp://nardus.mpn.gov.rs/bitstream/id/40980/IzvestajKomisije17691.pdf
dc.identifier.fulltexthttp://nardus.mpn.gov.rs/bitstream/id/40979/Disertacija17691.pdf


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