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master's thesis
Utjecaj natrijevog alginata i prerade na toplinska svojstva poli(etilen-oksida)
diplomski rad
2019. urn:nbn:hr:167:984637
Brkić, Ružica
University of Split
Faculty of Chemistry and Technology
Division of Engineering and Chemistry

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Brkić, R. (2019). Utjecaj natrijevog alginata i prerade na toplinska svojstva poli(etilen-oksida) : diplomski rad (Master's thesis). Split: University of Split, Faculty of Chemistry and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:167:984637

Brkić, Ružica. "Utjecaj natrijevog alginata i prerade na toplinska svojstva poli(etilen-oksida) : diplomski rad." Master's thesis, University of Split, Faculty of Chemistry and Technology, 2019. https://urn.nsk.hr/urn:nbn:hr:167:984637

Brkić, Ružica. "Utjecaj natrijevog alginata i prerade na toplinska svojstva poli(etilen-oksida) : diplomski rad." Master's thesis, University of Split, Faculty of Chemistry and Technology, 2019. https://urn.nsk.hr/urn:nbn:hr:167:984637

Brkić, R. (2019). 'Utjecaj natrijevog alginata i prerade na toplinska svojstva poli(etilen-oksida) : diplomski rad', Master's thesis, University of Split, Faculty of Chemistry and Technology, accessed 08 December 2024, https://urn.nsk.hr/urn:nbn:hr:167:984637

Brkić R. Utjecaj natrijevog alginata i prerade na toplinska svojstva poli(etilen-oksida) : diplomski rad [Master's thesis]. Split: University of Split, Faculty of Chemistry and Technology; 2019 [cited 2024 December 08] Available at: https://urn.nsk.hr/urn:nbn:hr:167:984637

R. Brkić, "Utjecaj natrijevog alginata i prerade na toplinska svojstva poli(etilen-oksida) : diplomski rad", Master's thesis, University of Split, Faculty of Chemistry and Technology, Split, 2019. Available at: https://urn.nsk.hr/urn:nbn:hr:167:984637

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Metadata
TitleUtjecaj natrijevog alginata i prerade na toplinska svojstva poli(etilen-oksida) : diplomski rad
Title (english)Influence of sodium alginate and the processing on the termal properties of poly(ethylene oxide) : diploma thesis
AuthorRužica Brkić
MentorSanja Perinović Jozić (mentor)
MBZ: 267214
Committee memberMiće Jakić (predsjednik povjerenstva)
Committee memberZvonimir Marijanović (član povjerenstva)
Committee memberSanja Perinović Jozić (član povjerenstva)
GranterUniversity of Split
Faculty of Chemistry and Technology
(Division of Engineering and Chemistry)
Split
Defense date and country2019-10-30, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Chemical Engineering
Abstract
Modifikacija poli(etilen-oksida) (PEO) razliĉitih molekulnih masa provedena je dodatkom natrijevog alginata (NaAlg) pripravom pomoću ekstrudera i preše s ciljem dobivanja boljih toplinskih svojstva i kristalnosti PEO-a. Uspješno su pripravljeni samo neki kompoziti razliĉitih molekulnih masa PEO-a s razliĉitim udjelima natrijevog alginata (NaAlg) ekstruzijom i prešanjem. Primjenom infracrvene spektroskopije s Fouierovom transformacijom (FT-IR) nije potvrĊena interakcija izmeĊu PEO-a i NaAlg- a u vidu vodikovih veza. Pomoću diferencijalne pretražne kalorimetrije (DSC) provedeno je ispitivanje utjecaja razliĉitih udjela biorazgradljivog polimera iz obnovljivih izvora (NaAlg) na toplinska svojstva i kristalnost vodotopljivog PEO razliĉitih molekulnih masa, te ovisnost navedenih svojstava o postupku praoblikovanja. Rezultati ukazuju kako NaAlg ne remeti toplinska svojstva i kristalnost PEO-a, te promjena molekulne mase nema znaĉajan utjecaj ali se utjecaj razliĉitih postupaka praoblikovanja ne može zanemariti. Toplinska postojanost kompozita istraživana je primjenom neizotermne termogravimetrije (TG). PEO/NaAlg kompoziti razgraĊuju se u tri stupnja razgradnje. NaAlg pogoršava toplinsku postojanost svih kompozita, te nije utvrĊena razlika izmeĊu utjecaja razliĉitih molekulnih masa i postupaka praoblikovanja.
Abstract (english)
The modification of poly(ethylene oxide) (PEO) of different molecular weight was carried out with addition of sodium alginate (NaAlg) by the extruder and the press, to obtain better thermal characteristics and crystallinity of PEO. Only some PEO/NaAlg composites with different molecular weight of PEO and with extrusion and compression have been successfully prepared. Fourier transform infrared spectroscopy (FT-IR) did not confirm the interaction between PEO and NaAlg in the form of hydrogen bonds. Using differential scanning calorimetry (DSC), the effect of different proportions of biodegradable polymer from renewable sources (NaAlg) on the thermal characteristics and crystallinity of water-soluble PEO with different molecular weights was investigated, as well as the dependence of these characteristics on the preparation process. The results indicate that NaAlg does not change the thermal characteristics and crystallinity of PEO. The change in molecular weight of PEO has no significant effect too, but the influence of different preparation processes cannot be neglected. The thermal stability of the composite was investigated using nonisothermal thermogravimetry (TG). PEO/NaAlg composites decompose in three degradation stages. NaAlg impairs the thermal stability of all composites and no difference was found between the influence of different molecular weights and the preparation processes.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:167:984637
Study programmeTitle: Chemical Technology; specializations in: Materials, Environmental Protection, Mediteranean Cultures
Course: Materials
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2019-11-27 11:21:44